CN101674672B - Outdoor wireless monitoring system of patient in hospital and patient positioning method thereof - Google Patents

Outdoor wireless monitoring system of patient in hospital and patient positioning method thereof Download PDF

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CN101674672B
CN101674672B CN2009101535243A CN200910153524A CN101674672B CN 101674672 B CN101674672 B CN 101674672B CN 2009101535243 A CN2009101535243 A CN 2009101535243A CN 200910153524 A CN200910153524 A CN 200910153524A CN 101674672 B CN101674672 B CN 101674672B
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capacitor
links
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rssi
value
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CN101674672A (en
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徐晓忻
孙斌
仲立芳
李化东
张建渭
徐佳东
杨勇
吴明光
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Zhejiang University ZJU
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Zhejiang University ZJU
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Abstract

The invention discloses an outdoor wireless monitoring system of a patient in a hospital, consisting of three parts, namely a ZigBee wireless sensor network, a dual-mode wireless transmission system and an upper computer, wherein the ZigBee wireless sensor network comprises a coordinator node, a reference node and a patient positioning and physical parameter collecting node; the dual-mode wireless transmission system can carry out Ethernet transmission and GPRS network transmission; the software of the upper computer is divided into a head nurse station, a resident enrolled nurse station and a nurse duty station. The system collects the physical parameters of electrocardio, blood oxygen, blood pressure, pulse rate, body temperature and the like and outdoor position data of the patient in real time; a true-code and reverse-code calibration method is adopted when in wireless transmission; a fusion method of Manhattan difference value positioning and Location Engine positioning is adopted when in positioning; and the system has the functions of emergency alarm of patients, under-current alarm of batteries, threshold alarm of physical parameters and the like and ensures that the patients in outdoor activities obtain real-time and effective monitoring.

Description

A kind of outdoor wireless monitoring system of patient in hospital and patient positioning method thereof
Technical field
The present invention relates to the medical monitoring technical field, relate in particular to a kind of outdoor wireless monitoring system of patient in hospital and patient positioning method thereof.
Background technology
Carry out a volume tracing nursing monitoring for urgent patient and patient with the danger of bursting property, start from three abroad, the forties.Placed one's entire reliance upon at that time nursing staff's direct nurse there is no any instrument.The fifties, because transistorized birth, Medical Instruments volume-diminished, cost reduce, and begin to occur the field monitoring instrument of vital sign parameters such as blood pressure, breathing, body temperature.In this field, what be in the technological precedence status for a long time is company of Siemens (SIEMEMS).In the sixties, Siemens Company takes the lead in releasing first generation wired remote control medical care monitor, can monitor physiological parameters such as electrocardiogram, blood pressure, breathing, body temperature, but the volume of instrument is bigger, and certainty of measurement and reliability are not high.
After entering the nineties, along with the widely-used and computer technology of very lagre scale integrated circuit (VLSIC), the development of computer network communication technology, made on the performance of medical monitor a new step, medical monitoring equipment has not only become digital device from analog machine, and on accuracy of measuring and accuracy significant raising has been arranged all.In addition, become the common cover distributed systems of forming of each equipment from working alone of each equipment, the doctor can understand patient's related physiological parameters from the computer screen of office.
After entering 21st century, along with people growing to the high-quality demand for medical service, people have been not content with and only have been confined to indoor wired medical monitoring system.Wireless communication technology flourish, the particularly development of wireless sensor network technology is for this demand that satisfies people provides strong technical support.
Numerous engineers and technicians have carried out a lot of useful explorations to this emerging field, have also produced a lot of scientific achievements, and wherein the most representative achievement is as follows:
1, patent of invention " based on medical monitoring system, the device and method of wireless sensor network " (CN200410009853.8) proposes to adopt wireless sensor network formation piconet that patient's physiological data is transmitted.
2, patent of invention " a kind of digital medical monitoring system " (CN 200610122088.X) proposes to guard data by wireless transmission, and by GPS the patient is positioned.
3, patent of invention " the ward wireless monitoring based on ZigBee is " (CN200810199072.8) proposes a kind of wearable indoor monitor system that adopts the ZigBee wireless technology.
Above-mentioned technology path of benefiting our pursuits is correct, but has many limitations, needs to do further to improve.Though achievement 1 has adopted wireless sensor network as transmission means, owing to lack the support of international standard, the system that makes lacks compatible, simultaneously also in the maintenance cost that has improved system virtually.Secondly, setting up a plurality of piconets based on wireless sensor network in hospital, family, community guards the patient, but lack location mechanism effectively, in case find that the patient occurs physically differently can't learning but where the patient outside the hospital holds, and medical monitoring has also just lost its meaning.Though achievement 2 adopts the GPS location, the power consumption of the power supply capacity GPS chip that relative medical monitoring equipment is limited is excessive, and the GPS expense is also higher.Though achievement 3 has greatly improved medical service quality to the patient based on the wearable monitor system of ZigBee technology, its monitoring scope is too small only to be confined to indoorly, and the scope of activities that this has limited the patient has greatly reduced patient's medical treatment and experienced.
Take a broad view of existing outdoor wireless monitoring system of patient, all have defective, lack effective solution in high reliability aspect wireless transmission and the instrument power supply and high availability aspect.This shows that a kind of more rational patient monitoring scheme need possess following characteristics: 1, radio communication is adopted international standards, consider that simultaneously China's actual conditions should adopt the 2.4GHz frequency range to be advisable.2, the power consumption of outdoor patient's custodial care facility is less.3, the monitoring to the outdoor activities patient should possess positioning function.4, equipment should possess high reliability and high availability aspect wireless transmission and the instrument power supply.
Summary of the invention
The objective of the invention is deficiency, a kind of outdoor wireless monitoring system of patient in hospital and patient positioning method thereof are provided at the outdoor monitor system of existing patient in hospital.
Outdoor wireless monitoring system of patient in hospital is that host computer links to each other with the dual-mode wireless transmission system with GPRS network by Ethernet; The dual-mode wireless transmission system is connected with the ZigBee wireless sensor network by the RS232 serial ports.The inside annexation of dual-mode wireless transmission system is: the supply voltage modular converter links to each other with GPRS DTU module with the WLAN module.The ZigBee wireless sensor network is made up of coordinator node, reference node, patient location and physiological parameter acquisition node three parts; Coordinator node, reference node, patient location and physiological parameter acquisition node interconnect by the 2.4GHz wireless network; Coordinator node makes to be responsible for the foundation and the data forwarding between ZigBee wireless sensor network and dual-mode wireless transmission system of ZigBee wireless sensor network.The inside annexation of coordinator node is: the CC2430 integrated chip links to each other with serial ports level switch module, supply voltage modular converter, minimum system peripheral circuit respectively.The inside annexation of reference node is: link to each other with minimum system peripheral circuit unit, keyboard input module, supply voltage modular converter, OLED display module respectively patient location of CC2430 integrated chip with the inside annexation of physiological parameter acquisition node is: the CC2431 integrated chip links to each other with minimum system peripheral circuit unit, supply voltage conversion and detection module, OLED display module, emergency alarm key-press module, serial ports level switch module respectively; The physiological parameter acquisition module is connected with serial ports level switch module, supply voltage conversion and detection module respectively; Patient location and physiological parameter acquisition node adopt lithium battery and the power supply of standby button cell.
Described CC2430 integrated chip with the circuit of minimum system peripheral circuit unit is: link to each other the other end ground connection of capacitor C 411 and capacitor C 71 with an end of digital circuit power supply DVDD_3.3V, capacitor C 411, capacitor C 71 after the pin 20,7,47,41 of CC2430 integrated chip links to each other; Pin 42 links to each other with an end of capacitor C 421, the other end ground connection of capacitor C 421; The end of one end of pin 10 and capacitor C 678, resistance R 406, button S1 links to each other, the other end ground connection of capacitor C 678 and button S1, and the other end of resistance R 406 links to each other with digital circuit power supply DVDD_3.3V; Pin 23 links to each other with an end of digital circuit power supply DVDD_3.3V and capacitor C 231, the other end ground connection of capacitor C 231; Pin 24 links to each other with an end of analog circuit power supply VCC1.8 and capacitor C 241, the other end ground connection of capacitor C 241; Pin 26 links to each other with an end of resistance R 261, the other end ground connection of resistance R 261; Pin 22 links to each other with an end of resistance R 221, the other end ground connection of resistance R 221; Pin 19 links to each other with an end of crystal oscillator X1 and capacitor C 191, and the other end of crystal oscillator X1 links to each other with an end of pin 21 and capacitor C 121, the equal ground connection of the other end of capacitor C 191 and capacitor C 121; Pin 44 links to each other with an end of crystal oscillator X2 and capacitor C 441, and the other end of crystal oscillator X2 links to each other with an end of pin 43 and capacitor C 431, the equal ground connection of the other end of capacitor C 441 and capacitor C 431; Pin 34 links to each other with an end of inductance L 2 and inductance L 5, one end of inductance L 4 and inductance L 1 links to each other with the other end of inductance L 5, pin 33 links to each other with the other end of inductance L 1, pin 32 links to each other with the other end of inductance L 2 and inductance L 4, one end of inductance L 3 links to each other with an end of capacitor C 63, and the other end of capacitor C 63 links to each other with antenna ANT1; Pin 25,27,28,29,30,31,35,36,37,38,39,40 links to each other with an end of analog circuit power supply VCC1.8, capacitor C 11, capacitor C 101, capacitor C 371, the other end ground connection of capacitor C 11, capacitor C 101, capacitor C 371.
Described CC2431 integrated chip with the circuit of minimum system peripheral circuit unit is: link to each other the other end ground connection of capacitor C 411 and capacitor C 71 with an end of digital circuit power supply DVDD_3.3V, capacitor C 411, capacitor C 71 after the pin 20,7,47,41 of CC2431 integrated chip links to each other; Pin 42 links to each other with an end of capacitor C 421, the other end ground connection of capacitor C 421; The end of one end of pin 10 and capacitor C 678, resistance R 406, button S1 links to each other, the other end ground connection of capacitor C 678 and button S1, and the other end of resistance R 406 links to each other with digital circuit power supply DVDD_3.3V; Pin 23 links to each other with an end of digital circuit power supply DVDD_3.3V and capacitor C 231, the other end ground connection of capacitor C 231; Pin 24 links to each other with an end of analog circuit power supply VCC1.8 and capacitor C 241, the other end ground connection of capacitor C 241; Pin 26 links to each other with an end of resistance R 261, the other end ground connection of resistance R 261; Pin 22 links to each other with an end of resistance R 221, the other end ground connection of resistance R 221; Pin 19 links to each other with an end of crystal oscillator X1 and capacitor C 191, and the other end of crystal oscillator X1 links to each other with an end of pin 21 and capacitor C 121, the equal ground connection of the other end of capacitor C 191 and capacitor C 121; Pin 44 links to each other with an end of crystal oscillator X2 and capacitor C 441, and the other end of crystal oscillator X2 links to each other with an end of pin 43 and capacitor C 431, the equal ground connection of the other end of capacitor C 441 and capacitor C 431; Pin 34 links to each other with an end of inductance L 2 and inductance L 5, one end of inductance L 4 and inductance L 1 links to each other with the other end of inductance L 5, pin 33 links to each other with the other end of inductance L 1, pin 32 links to each other with the other end of inductance L 2 and inductance L 4, one end of inductance L 3 links to each other with an end of capacitor C 63, and the other end of capacitor C 63 links to each other with antenna ANT1; Pin 25,27,28,29,30,31,35,36,37,38,39,40 links to each other with an end of analog circuit power supply VCC1.8, capacitor C 11, capacitor C 101, capacitor C 371, the other end ground connection of capacitor C 11, capacitor C 101, capacitor C 371.
The circuit of described supply voltage conversion and detection module is: the negativing ending grounding of lithium battery and button cell; The positive pole of lithium battery links to each other with the pin of relay 5 normally opened contacts and pin 1COM end; The positive pole of button cell links to each other with the pin of relay 4 normally-closed contacts; Relay pin 3, pin 8 ground connection; Relay pin 7 normally-closed contacts meet VCC; Ground connection after the end of relay pin 10COM terminating resistor R20, the other end of resistance R 20 link to each other with an end, the pin 3 of capacitor C 16, capacitor C 9, capacitor C 17; Pin 6 normally opened contacts connect pin 4, the pin 1 of supply voltage conversion chip TPS79533, the pin 2 of physiological parameter acquisition module, an end of resistance R 21, and the other end of capacitor C 16, capacitor C 9 links to each other; The pin 1 of another termination CC2431 of resistance R 21 and an end of resistance R 22, the other end ground connection of resistance R 22; The pin 5 of TPS79533 connects the other end of capacitor C 17; The pin 4 of TPS79533 connects the positive pole of VCC and LED 1, the end of the negative pole connecting resistance R19 of LED 1, the other end ground connection of resistance R 19.
The patient positioning method of outdoor wireless monitoring system of patient in hospital is:
1) patient location and physiological parameter acquisition node are with the form of broadcasting, and the ZigBee wireless sensor network reference node in a jumping scope sends Location Request;
2) reference node obtains the RSSI of signals value after the request of receiving, and is designated as RSSI Blind_i, wherein i is the ZigBee short address of patient location and physiological parameter acquisition node, reference node upgrades the RSSI storehouse, in the RSSI storehouse as if there not being RSSI Blind_iClauses and subclauses are then created RSSI Blind_iClauses and subclauses are set up the formation that length is 10-20, with RSSI Blind_iValue writes head of the queue, with RSSI Blind_iValue is as RSSI Blind_iThe mean value of formation is designated as RSSI Blind_ave_i, if RSSI Blind_iLess than queue length, then directly write RSSI in the number of formation at tail of the queue Blind_iValue, and ask its mean value as RSSI Blind_ave_iValue, if RSSI Blind_iNumber reach queue length, then reject head of the queue RSSI Blind_iThe value, with head of the queue back one as new head of the queue, with up-to-date RSSI Blind_iValue writes tail of the queue, and the mean value of asking this formation is as RSSI Blind_ave_iValue, finish RSSI Blind_ave_iAfter the calculating, whether system queries starts regularly, if the regular device of then resetting is arranged, carries out timing again, if then do not start timer, if timing then delete RSSI in database Blind_iClauses and subclauses;
3) according to the RSSI mean value of other node reference nodes on every side in the RSSI storehouse, be designated as RSSI Ref_ave_j, wherein j is the ZigBee short address of corresponding reference node, according to formula M i = Σ ref _ ave _ j | RSSI blind _ ave _ i - RSSI ref _ ave _ j | Calculate the Manhattan difference value, wherein i is the ZigBee short address of reference node, if also there is not RSSI in the RSSI storehouse Ref_ave_jBe worth then M 1=NULL;
4) reference node sends M with form all nodes in a jumping scope of broadcasting 1Value and coordinate figure;
5) reference node will receive M iWhen value and coordinate figure, obtain the RSSI of signals value, be designated as RSSI Ref_j, wherein j is for sending M iThe ZigBee short address of the reference node of value and coordinate figure, reference node upgrades the RSSI storehouse, if do not have RSSI in the RSSI storehouse Ref_jClauses and subclauses are then created RSSI Ref_jClauses and subclauses are set up the formation that length is 10-20, with RSSI Ref_jValue writes head of the queue, with RSSI Ref_jValue is as RSSI Ref_jThe mean value of formation is designated as RSSI Ref_ave_j, if RSSI Ref_jNumber in formation then directly writes RSSI at tail of the queue less than queue length Ref_jValue, and ask its mean value as RSSI Ref_jave_jValue.If RSSI Ref_j'sNumber reaches queue length, then rejects head of the queue RSSI Ref_jThe value, with head of the queue back one as new head of the queue, with up-to-date RSSI Ref_jValue writes tail of the queue, and the mean value of asking this formation is as RSSI Ref_ave_jValue;
6) patient location and physiological parameter acquisition node are receiving M 1Behind value and the coordinate figure, according to formula ( X Manhat tan , Y Manhat tan ) = ( M 1 - α X 1 + M 2 - α X 2 + . . . . . . . M N - α X N M 1 - α + M 2 - α + . . . . . . M N - α , M 1 - α Y 1 + M 2 - α Y 2 + . . . . . . . M N - α Y N M 1 - α + M 2 - α + . . . . . . M N - α ) Draw the coordinate estimated value of Manhattan difference, wherein α is a weight factor, if M 1~M NValue do not have (X then Manhattan, Y Manhattan)=(16383.75,16383.75), after network patient location and physiological parameter acquisition node RSSI value are to the received signal carried out the bound Filtering Processing, as if the number of RSSI effective value less than 3, (X then Location, Y Location)=(16383.75,16383.75), if the number of RSSI effective value is greater than 3, then these RSSI effective values are sorted, choose minimum value wherein, coordinate figure X, the Y of the information that it is corresponding and be stored in these four parameters of envirment factor A, N in the system and send among the Location Engine of network patient location and physiological parameter acquisition node chip CC2431 and calculate draws the estimated value (X of current network patient location and physiological parameter acquisition node coordinate Location, Y Location), drawing (X Manhattan, Y Manhattan) and (X Location, Y Locanon) back root following formula carries out data fusion,
X Est = X Manhat tan ( 1 ) X Location ( 2 ) βX Location + ( 1 - β ) X Manhat tan ( 3 ) γX Manhat tan + ( 1 - γ ) X Location ( 4 ) 16383.75 ( 5 ) Y Est = Y Mahat tan ( 1 ) Y Location ( 2 ) Y Location + ( 1 - β ) Y Mahat tan ( 3 ) γY Mahat tan + ( 1 - γ ) Y Location ( 4 ) 16383.75 ( 5 )
Wherein beta, gamma is a weight factor all, works as X LocationOr Y LocationBe worth and adopt formula (1) when invalid, work as X ManhattanOr Y MahattanBe worth and adopt formula (2) when invalid, when calculating M iThe time RSSI Ref_jWhen the value number does not reach queue length or X LocationOr Y LocationValue adopts formula (3) during less than 3m, when calculating M iThe time RSSI Fef_jWhen the value number reaches queue length or X ManhattanOr Y MahattanWork as X with formula (4) during greater than 3m Location, X ManhattanOr Y Location, Y MahattanBe worth and adopt formula (5) when invalid, after finishing the location, locating information, physiological parameter information, warning message are taken place to coordinator node by the mode of true form complement code verification, and transfer to host computer by the dual-mode wireless transmission system.
The present invention is possessing high reliability and high availability aspect wireless transmission and the power devices.The fusion method of Manhattan difference value location and Location Engine location is adopted in the location, has improved the reliability of Manhattan difference value location by average value filtering, has improved the accuracy of Location Engine location by limit filtration.In addition, can reduce invalid data effectively, merge and adopt weighting algorithm, improve locating accuracy and accuracy by data fusion.The dual-mode wireless transmission system can improve safety of transmission greatly, the expense of reduction system operation.Under normal circumstances adopt the WLAN module to transmit, when the WLAN module breaks down, then adopt the transmission of GPRS module, after removing the WLAN fault, then reuse the WLAN module and transmit.
Description of drawings
Fig. 1 is the outdoor monitor system structured flowchart of a kind of patient in hospital;
Fig. 2 is a dual-mode wireless transmission system structured flowchart;
Fig. 3 is the wireless sensor network structured flowchart;
Fig. 4 is the coordinator node structured flowchart;
Fig. 5 is the reference node structured flowchart;
Fig. 6 is that the patient locatees and physiological parameter acquisition node structured flowchart;
Fig. 7 is the circuit diagram of CC2430 integrated chip and minimum system peripheral circuit unit;
Fig. 8 is the circuit diagram of CC2431 integrated chip and minimum system peripheral circuit unit;
Fig. 9 is the circuit diagram of supply voltage conversion and detection module;
Figure 10 is the flow chart of coordinator node;
Figure 11 is the flow chart of reference node;
Figure 12 is that the patient locatees the flow chart with the physiological parameter acquisition node;
Figure 13 (a) is a host computer charge nurse station software flow chart;
Figure 13 (b) is host computer registered nurse's station software flow chart of being in hospital;
Figure 13 (c) is a host computer nurse station on duty software flow pattern.
Embodiment
Shown in Fig. 1~6, outdoor wireless monitoring system of patient in hospital is that host computer links to each other with the dual-mode wireless transmission system with GPRS network by Ethernet; The dual-mode wireless transmission system is connected with the ZigBee wireless sensor network by the RS232 serial ports.The inside annexation of dual-mode wireless transmission system is: the supply voltage modular converter links to each other with GPRS DTU module with the WLAN module.The ZigBee wireless sensor network is made up of coordinator node, reference node, patient location and physiological parameter acquisition node three parts; Coordinator node, reference node, patient location and physiological parameter acquisition node interconnect by the 2.4GHz wireless network; Coordinator node makes to be responsible for the foundation and the data forwarding between ZigBee wireless sensor network and dual-mode wireless transmission system of ZigBee wireless sensor network.The inside annexation of coordinator node is: the CC2430 integrated chip links to each other with serial ports level switch module, supply voltage modular converter, minimum system peripheral circuit respectively.The inside annexation of reference node is: link to each other with minimum system peripheral circuit unit, keyboard input module, supply voltage modular converter, OLED display module respectively patient location of CC2430 integrated chip with the inside annexation of physiological parameter acquisition node is: the CC2431 integrated chip links to each other with minimum system peripheral circuit unit, supply voltage conversion and detection module, OLED display module, emergency alarm key-press module, serial ports level switch module respectively; The physiological parameter acquisition module is connected with serial ports level switch module, supply voltage conversion and detection module respectively; Patient location and physiological parameter acquisition node adopt lithium battery and the power supply of standby button cell.
The CC2430 integrated chip with the circuit of minimum system peripheral circuit unit is as shown in Figure 7: link to each other the other end ground connection of capacitor C 411 and capacitor C 71 with an end of digital circuit power supply DVDD_3.3V, capacitor C 411, capacitor C 71 after the pin 20,7,47,41 of CC2430 integrated chip links to each other; Pin 42 links to each other with an end of capacitor C 421, the other end ground connection of capacitor C 421; The end of one end of pin 10 and capacitor C 678, resistance R 406, button S1 links to each other, the other end ground connection of capacitor C 678 and button S1, and the other end of resistance R 406 links to each other with digital circuit power supply DVDD_3.3V; Pin 23 links to each other with an end of digital circuit power supply DVDD_3.3V and capacitor C 231, the other end ground connection of capacitor C 231; Pin 24 links to each other with an end of analog circuit power supply VCC1.8 and capacitor C 241, the other end ground connection of capacitor C 241; Pin 26 links to each other with an end of resistance R 261, the other end ground connection of resistance R 261; Pin 22 links to each other with an end of resistance R 221, the other end ground connection of resistance R 221; Pin 19 links to each other with an end of crystal oscillator X1 and capacitor C 191, and the other end of crystal oscillator X1 links to each other with an end of pin 21 and capacitor C 121, the equal ground connection of the other end of capacitor C 191 and capacitor C 121; Pin 44 links to each other with an end of crystal oscillator X2 and capacitor C 441, and the other end of crystal oscillator X2 links to each other with an end of pin 43 and capacitor C 431, the equal ground connection of the other end of capacitor C 441 and capacitor C 431; Pin 34 links to each other with an end of inductance L 2 and inductance L 5, one end of inductance L 4 and inductance L 1 links to each other with the other end of inductance L 5, pin 33 links to each other with the other end of inductance L 1, pin 32 links to each other with the other end of inductance L 2 and inductance L 4, one end of inductance L 3 links to each other with an end of capacitor C 63, and the other end of capacitor C 63 links to each other with antenna ANT1; Pin 25,27,28,29,30,31,35,36,37,38,39,40 links to each other with an end of analog circuit power supply VCC1.8, capacitor C 11, capacitor C 101, capacitor C 371, the other end ground connection of capacitor C 11, capacitor C 101, capacitor C 371.
The CC2431 integrated chip with the circuit of minimum system peripheral circuit unit is as shown in Figure 8: link to each other the other end ground connection of capacitor C 411 and capacitor C 71 with an end of digital circuit power supply DVDD_3.3V, capacitor C 411, capacitor C 71 after the pin 20,7,47,41 of CC2431 integrated chip links to each other; Pin 42 links to each other with an end of capacitor C 421, the other end ground connection of capacitor C 421; The end of one end of pin 10 and capacitor C 678, resistance R 406, button S1 links to each other, the other end ground connection of capacitor C 678 and button S1, and the other end of resistance R 406 links to each other with digital circuit power supply DVDD_3.3V; Pin 23 links to each other with an end of digital circuit power supply DVDD_3.3V and capacitor C 231, the other end ground connection of capacitor C 231; Pin 24 links to each other with an end of analog circuit power supply VCC1.8 and capacitor C 241, the other end ground connection of capacitor C 241; Pin 26 links to each other with an end of resistance R 261, the other end ground connection of resistance R 261; Pin 22 links to each other with an end of resistance R 221, the other end ground connection of resistance R 221; Pin 19 links to each other with an end of crystal oscillator X1 and capacitor C 191, and the other end of crystal oscillator X1 links to each other with an end of pin 21 and capacitor C 121, the equal ground connection of the other end of capacitor C 191 and capacitor C 121; Pin 44 links to each other with an end of crystal oscillator X2 and capacitor C 441, and the other end of crystal oscillator X2 links to each other with an end of pin 43 and capacitor C 431, the equal ground connection of the other end of capacitor C 441 and capacitor C 431; Pin 34 links to each other with an end of inductance L 2 and inductance L 5, one end of inductance L 4 and inductance L 1 links to each other with the other end of inductance L 5, pin 33 links to each other with the other end of inductance L 1, pin 32 links to each other with the other end of inductance L 2 and inductance L 4, one end of inductance L 3 links to each other with an end of capacitor C 63, and the other end of capacitor C 63 links to each other with antenna ANT1; Pin 25,27,28,29,30,31,35,36,37,38,39,40 links to each other with an end of analog circuit power supply VCC1.8, capacitor C 11, capacitor C 101, capacitor C 371, the other end ground connection of capacitor C 11, capacitor C 101, capacitor C 371.
The circuit of supply voltage conversion and detection module is as shown in Figure 9: the negativing ending grounding of lithium battery and button cell; The positive pole of lithium battery links to each other with the pin of relay 5 normally opened contacts and pin 1COM end; The positive pole of button cell links to each other with the pin of relay 4 normally-closed contacts; Relay pin 3, pin 8 ground connection; Relay pin 7 normally-closed contacts meet VCC; Ground connection after the end of relay pin 10COM terminating resistor R20, the other end of resistance R 20 link to each other with an end, the pin 3 of capacitor C 16, capacitor C 9, capacitor C 17; Pin 6 normally opened contacts connect pin 4, the pin 1 of supply voltage conversion chip TPS79533, the pin 2 of physiological parameter acquisition module, an end of resistance R 21, and the other end of capacitor C 16, capacitor C 9 links to each other; The pin 1 of another termination CC2431 of resistance R 21 and an end of resistance R 22, the other end ground connection of resistance R 22; The pin 5 of TPS79533 connects the other end of capacitor C 17; The pin 4 of TPS79533 connects the positive pole of VCC and LED 1, the end of the negative pole connecting resistance R19 of LED 1, the other end ground connection of resistance R 19.Its operation principle is: when lithium battery electric power was sufficient, relay got electric, the normal-closed end adhesive, and lithium battery is directly to physiological parameter acquisition module and ZigBee patient location and physiological parameter acquisition node module for power supply.When lithium battery electric power was not enough, relay was because electric current and undertension and dead electricity, the adhesive of relay normally open end.Lithium battery is stopped power supply, and changes by standby button cell and directly powers to the CC2431 integrated chip and the minimum system peripheral circuit unit of ZigBee patient location and physiological parameter acquisition node.In the power source conversion process, level on the pin 1 of ZigBee patient location and physiological parameter acquisition node module chip CC2431 produces a trailing edge and causes that the CC2431 chip internal interrupts in the process that is become 0V by 3.3V, will trigger alert event after interrupting producing.
As shown in figure 10, the coordinator node workflow is: after system finished initialization, coordinator node began to create the ZigBee network as telegon.The OS of system carries out scan round to each thread after finishing establishment ZigBee network.In the coordinator node thread, if serial ports has data inputs, if reading of data content and it is carried out verification then is by verification then this order of transmission in the ZigBee network, if not by verification then system sends the request of resending to host computer.In the coordinator node thread, if receive the ZigBee network information, the information that receives is carried out the verification of true form radix-minus-one complement, and its principle is that the data length expansion that will send is twice, and first half is a true form, latter half is a radix-minus-one complement, during verification true form and radix-minus-one complement are carried out XOR, if the result is 0, it is correct to illustrate that then data send, if be not 0, then illustrate when data send and make mistakes.After carrying out the verification of true form radix-minus-one complement, if check results is not 0, then upwards re-send request may is sent in a jumping.If check results is 0, then system according to bunch indications to the information processing of classifying.After finishing these processing, these data are packed.If the WLAN module can be moved, then data are reached host computer by net too, if the WLAN module cannot move, then utilize GPRS DTU module by GPRS network with transfer of data to host computer.
As shown in figure 11, the reference node workflow is as being: after system finished initialization, system began to search the ZigBee telegon, if do not find time-delay to continue to search after 5 seconds, till finding the ZigBee telegon.After finding the ZigBee telegon, system OS carries out scan round to each thread, there is keyboard to press display button content in OLED if in the reference node thread, find, if after pressing definite key, system can judge the correctness of button content, if undesirable system prompt key errors also requires to re-enter, if the correct system of input content will read the coordinate figure of button and deposit among the flash.If receive the ZigBee network information, then according to the processing of classifying of a bunch identifier at the reference node thread.If the coordinate Query Information, then system returns the coordinate figure that exists among the flash to requesting node, return if coordinate figure does not exist default value (X, Y)=(16383.75,16383.75).If the coordinate configuration information then writes flash with new coordinate figure.If locating information, reference node obtains the RSSI of signals value and (is designated as RSSI Blind_i, wherein i is the ZigBee short address of patient location and physiological parameter acquisition node), reference node upgrades the RSSI storehouse, in the RSSI storehouse as if there not being RSSI Blind_iClauses and subclauses are then created RSSI Blind_iClauses and subclauses, the formation of setting up length 10-20 is with RSSI Blind_iValue writes head of the queue, with RSSI Blind_iValue is as RSSI Blind_iThe mean value of formation is designated as RSSI Blind_ave_i, if RSSI Blind_iLess than queue length, then directly write RSSI in the number of formation at tail of the queue Blind_iValue, and ask its mean value as RSSI Blind_ave_iValue.If RSSI Blind_iNumber reach queue length, then reject head of the queue RSSI Blind_iThe value, with head of the queue back one as new head of the queue, with up-to-date RSSI Blind_iValue writes tail of the queue, and the mean value of asking this formation is as RSSI Blind_ave_iValue, finish RSSI Blind_ave_iAfter the calculating, whether system queries starts 10s regularly, if the regular device of then resetting is arranged, carries out 10s again regularly, if then do not start timer.If regularly then in database, delete RSSI Blind_iClauses and subclauses; Reference node is designated as RSSI according to the RSSI mean value of other node reference nodes on every side in the RSSI storehouse Ref_ave_j, wherein j is the ZigBee short address of corresponding reference node, according to formula M i = Σ ref _ ave _ j | RSSI blind _ ave _ i - RSSI ref _ ave _ j | Calculate the Manhattan difference value, wherein i is the ZigBee short address of reference node, if also there is not RSSI in the RSSI storehouse Ref_ave_jBe worth then M i=NULL; Calculating M 1Back reference node sends M with form all nodes in a jumping scope of broadcasting iValue and coordinate figure.If reference node receives M iValue and coordinate figure obtain the RSSI of signals value and (are designated as RSSI Ref_j, wherein j is for sending M iThe ZigBee short address of the reference node of value and coordinate figure) reference node upgrades the RSSI storehouse, if do not have RSSI in the RSSI storehouse Ref_jClauses and subclauses are then created RSSI Ref_jClauses and subclauses, the formation of setting up length 10-20 is with RSSI Ref_jValue writes head of the queue, with RSSI Ref_jValue is as RSSI Ref_jThe mean value of formation is designated as RSSI Ref_ave_j, if RSSI Ref_jNumber in formation then directly writes RSSI at tail of the queue less than queue length Ref_jValue, and ask its mean value as RSSI Ref_jave_jValue.If RSSI Ref_jNumber reach queue length, then reject head of the queue RSSI Ref_jThe value, with head of the queue back one as new head of the queue, with up-to-date RSSI Ref_jValue writes tail of the queue, and the mean value of asking this formation is as RSSI Ref_ave_jValue; If routing iinformation then carries out the verification of true form radix-minus-one complement to the data that receive, if check results is not 0, then upwards re-send request may is sent in a jumping.If check results is 0, then jumps to next and send data up to successfully sending Data Position according to the route chained list.
As shown in figure 12, patient location and physiological parameter acquisition node system works flow process are as follows: after system finished initialization, system began to search the ZigBee telegon, if do not find time-delay to continue to search after 5 seconds, till finding the ZigBee telegon.After finding the ZigBee telegon, system OS carries out scan round to each thread.If in physiological parameter collection and the location thread, serial ports has data inputs, then buffer memory is read in by DMA with serial data in system, and the data in the buffer memory are handled, if finish frame data, then according to protocol rule the data that read is carried out verification.If in physiological parameter collection and the location thread, patient's emergency alarm button is pressed, then system produces alert event, and starts the warning timing in one 10 second.System sends patient's emergency alarm information to the ZigBee network to coordinator node according to time slot mechanism in the warning time slot, coordinator node is forwarded to host computer with the information that receives.Host computer sends confirmation to ZigBee patient location and physiological parameter acquisition node after receiving warning message.System stops to send warning message and cancellation warning timing after receiving the host computer confirmation, if system does not receive the affirmation information from host computer in 10 seconds, then system reports to the police again.If in physiological parameter collection and the location thread, CC2431 chip pin 1 has interrupt signal, OLED shows that battery is about to exhaust information.Simultaneity factor produces alert event, and starts the warning timing in one 10 second.System is according to time slot mechanism, in the warning time slot, send the warning message that battery is about to exhaust to host computer to system, system stops to send warning message and cancellation warning timing after receiving the host computer confirmation, if system does not receive the affirmation information from host computer in 10 seconds, then system reports to the police again.If physiological parameter collection and location thread receive the ZigBee network information, system according to bunch indications to the information processing of classifying.If locating information, according to formula ( X Manhat tan , Y Manhat tan ) = ( M 1 - α X 1 + M 2 - α X 2 + . . . . . . . M N - α X N M 1 - α + M 2 - α + . . . . . . M N - α , M 1 - α Y 1 + M 2 - α Y 2 + . . . . . . . M N - α Y N M 1 - α + M 2 - α + . . . . . . M N - α ) Draw the coordinate estimated value of Manhattan difference, wherein α is a weight factor, if M 1~M NValue do not have (X then Manhattan, Y Manhattan)=(16383.75,16383.75), after network patient location and physiological parameter acquisition node RSSI value are to the received signal carried out the bound Filtering Processing, as if the number of RSSI effective value less than 3, (X then Location, Y Location)=(16383.75,16383.75), if the number of RSSI effective value is greater than 3, then these RSSI effective values are sorted, choose minimum value wherein, coordinate figure X, the Y of the information that it is corresponding and be stored in these four parameters of envirment factor A, N in the system and send among the Location Engine of network patient location and physiological parameter acquisition node chip CC2431 and calculate draws the estimated value (X of current network patient location and physiological parameter acquisition node coordinate Location, Y Location).Drawing (X Manhattan, Y Manhattan) and (X Location, Y Location) back root following formula carries out data fusion,
X Est = X Manhat tan ( 1 ) X Location ( 2 ) βX Location + ( 1 - β ) X Manhat tan ( 3 ) γX Manhat tan + ( 1 - γ ) X Location ( 4 ) 16383.75 ( 5 ) Y Est = Y Mahat tan ( 1 ) Y Location ( 2 ) Y Location + ( 1 - β ) Y Mahat tan ( 3 ) γY Mahat tan + ( 1 - γ ) Y Location ( 4 ) 16383.75 ( 5 )
Wherein beta, gamma all is a weight factor.Work as X LocationOr Y LocationBe worth and adopt formula (1) when invalid, work as X ManhattanOr Y MahattanBe worth and adopt formula (2) when invalid, when calculating M iThe time RSSI Ref_jWhen the value number does not reach queue length or X LocationOr Y LocationValue does not adopt formula (3) when the best in Manhattan difference value location adopts coordinates regional, when calculating M iThe time RSSI Ref_jWhen the value number reaches queue length or X ManhattanOr Y MahattanThe best in Manhattan difference value location adopts formula (4) to work as X when adopting in the coordinates regional Location, X ManhattanOr Y Location, Y MahattanBe worth and adopt formula (5) when invalid.If the positional parameter configuration information then writes new parameter among the flash.If the configuration information of physiological parameter acquisition module transmits to the physiological parameter acquisition module by serial ports after by verification, if then do not send repeat requests by verification.Time slot mechanism is adopted in the employing and the transmission of data in physiological parameter collection and location thread.After system finished initialization, system was that one-period carries out the datacycle transmission till successfully sending with 20 milliseconds, and preceding 2 milliseconds send locating information, and next 12 milliseconds send patient data information and positional information, and last 6 milliseconds are transmission.
Shown in Figure 13 (a), charge nurse's workflow of standing is as follows: behind the running software, the charge nurse inputs nurse's job number and password, check job number and password all correct after, the charge nurse can carry out the password of this account and revise, add and deletion nurse user, check patient's case information and, check nurse's operation note by real time data and historical datas such as the electrocardio of monitoring patients, blood pressure, blood oxygen, pulse frequency, heart rate, body temperature, positions.If the user need withdraw from, then need re-enter job number and password, check job number and password all correct after, can withdraw from.
Shown in Figure 13 (b), the registered nurse that the is in hospital workflow of standing is as follows: behind the running software, the nurse inputs nurse's job number and password, check job number and password all correct after, the nurse can carry out the password of this account and revise, and adds and the deletion patient information, referring to the historical medical record information of patient, revise and the current medical record information of deletion patient, add new case history.If the user need withdraw from, then need re-enter job number and password, check job number and password all correct after, can withdraw from.
Shown in Figure 13 (c), nurse station on duty workflow is as follows: behind the running software, the nurse inputs nurse's job number and password, check job number and password all correct after, upper software begins to receive the information of gateway forwards and to the processing of classifying of these information.If receive, patient's emergency alarm, running down of battery are reported to the police and patient's physiological data surpasses the warning of setting threshold values, and software will eject corresponding warning interface, and at the relevant position of database record alert event.The nurse made the corresponding subsequent processing decision according to patient's the state of an illness after, software write nurse's processing scheme the relevant position of database.If patient's physiological data and positional information, then in the interface, shown and write the relevant position of database.If what receive is the coordinate information of reference node, software is searched in database according to the address of this reference node, if there is this address in database, then upgrades its coordinate figure.If in database, do not exist then add this address in the database, and write coordinate figure.After finishing data processing, software is responded nurse's operation.Realize by gateway revising this user cipher according to nurse's key information, check historical monitoring data, check patient medical record, the parameter alarming threshold value of patient physiological is set to ZigBee network transmitting control commands.If the user need withdraw from, then need re-enter job number and password, in that to check job number and password all correct, after data-base recording withdraws from information, can withdraw from.

Claims (5)

1. an outdoor wireless monitoring system of patient in hospital is characterized in that host computer links to each other with the dual-mode wireless transmission system with GPRS network by Ethernet; The dual-mode wireless transmission system is connected with the ZigBee wireless sensor network by the RS232 serial ports; The inside annexation of dual-mode wireless transmission system is: the supply voltage modular converter links to each other with GPRS DTU module with the WLAN module; The ZigBee wireless sensor network is made up of coordinator node, reference node, patient location and physiological parameter acquisition node three parts; Coordinator node, reference node, patient location and physiological parameter acquisition node interconnect by the 2.4GHz wireless network; Coordinator node is responsible for the foundation and the data forwarding between ZigBee wireless sensor network and dual-mode wireless transmission system of ZigBee wireless sensor network; The inside annexation of coordinator node is: the CC2430 integrated chip links to each other with serial ports level switch module, supply voltage modular converter, minimum system peripheral circuit unit respectively; The inside annexation of reference node is: the CC2430 integrated chip links to each other with minimum system peripheral circuit unit, keyboard input module, supply voltage modular converter, OLED display module respectively; The patient location with the inside annexation of physiological parameter acquisition node is: the CC2431 integrated chip links to each other with minimum system peripheral circuit unit, supply voltage conversion and detection module, OLED display module, emergency alarm key-press module, serial ports level switch module respectively; The physiological parameter acquisition module is connected with serial ports level switch module, supply voltage conversion and detection module respectively, and patient location and physiological parameter acquisition node adopt lithium battery and the power supply of standby button cell.
2. a kind of outdoor wireless monitoring system of patient in hospital according to claim 1, it is characterized in that described CC2430 integrated chip with the circuit of minimum system peripheral circuit unit is: link to each other the other end ground connection of capacitor C 411 and capacitor C 71 with an end of digital circuit power supply DVDD_3.3V, capacitor C 411, capacitor C 71 after the pin 20,7,47,41 of CC2430 integrated chip links to each other; Pin 42 links to each other with an end of capacitor C 421, the other end ground connection of capacitor C 421; The end of one end of pin 10 and capacitor C 678, resistance R 406, button S1 links to each other, the other end ground connection of capacitor C 678 and button S1, and the other end of resistance R 406 links to each other with digital circuit power supply DVDD_3.3V; Pin 23 links to each other with an end of digital circuit power supply DVDD_3.3V and capacitor C 231, the other end ground connection of capacitor C 231; Pin 24 links to each other with an end of analog circuit power supply VCC1.8 and capacitor C 241, the other end ground connection of capacitor C 241; Pin 26 links to each other with an end of resistance R 261, the other end ground connection of resistance R 261; Pin 22 links to each other with an end of resistance R 221, the other end ground connection of resistance R 221; Pin 19 links to each other with an end of crystal oscillator X1 and capacitor C 191, and the other end of crystal oscillator X1 links to each other with an end of pin 21 and capacitor C 121, the equal ground connection of the other end of capacitor C 191 and capacitor C 121; Pin 44 links to each other with an end of crystal oscillator X2 and capacitor C 441, and the other end of crystal oscillator X2 links to each other with an end of pin 43 and capacitor C 431, the equal ground connection of the other end of capacitor C 441 and capacitor C 431; Pin 34 links to each other with an end of inductance L 2 and inductance L 5, one end of inductance L 4 and inductance L 1 links to each other with the other end of inductance L 5, pin 33 links to each other with the other end of inductance L 1, pin 32 links to each other with the other end of inductance L 2 and inductance L 4, one end of inductance L 3 links to each other with an end of capacitor C 63, the other end of inductance L 3 links to each other with pin 34, and the other end of capacitor C 63 links to each other with antenna ANT1; Pin 25,27,28,29,30,31,35,36,37,38,39,40 links to each other with an end of analog circuit power supply VCC1.8, capacitor C 11, capacitor C 101, capacitor C 371, the other end ground connection of capacitor C 11, capacitor C 101, capacitor C 371.
3. a kind of outdoor wireless monitoring system of patient in hospital according to claim 1, it is characterized in that described CC2431 integrated chip with the circuit of minimum system peripheral circuit unit is: link to each other the other end ground connection of capacitor C 411 and capacitor C 71 with an end of digital circuit power supply DVDD_3.3V, capacitor C 411, capacitor C 71 after the pin 20,7,47,41 of CC2431 integrated chip links to each other; Pin 42 links to each other with an end of capacitor C 421, the other end ground connection of capacitor C 421; The end of one end of pin 10 and capacitor C 678, resistance R 406, button S1 links to each other, the other end ground connection of capacitor C 678 and button S1, and the other end of resistance R 406 links to each other with digital circuit power supply DVDD_3.3V; Pin 23 links to each other with an end of digital circuit power supply DVDD_3.3V and capacitor C 231, the other end ground connection of capacitor C 231; Pin 24 links to each other with an end of analog circuit power supply VCC1.8 and capacitor C 241, the other end ground connection of capacitor C 241; Pin 26 links to each other with an end of resistance R 261, the other end ground connection of resistance R 261; Pin 22 links to each other with an end of resistance R 221, the other end ground connection of resistance R 221; Pin 19 links to each other with an end of crystal oscillator X1 and capacitor C 191, and the other end of crystal oscillator X1 links to each other with an end of pin 21 and capacitor C 121, the equal ground connection of the other end of capacitor C 191 and capacitor C 121; Pin 44 links to each other with an end of crystal oscillator X2 and capacitor C 441, and the other end of crystal oscillator X2 links to each other with an end of pin 43 and capacitor C 431, the equal ground connection of the other end of capacitor C 441 and capacitor C 431; Pin 34 links to each other with an end of inductance L 2 and inductance L 5, one end of inductance L 4 and inductance L 1 links to each other with the other end of inductance L 5, pin 33 links to each other with the other end of inductance L 1, pin 32 links to each other with the other end of inductance L 2 and inductance L 4, one end of inductance L 3 links to each other with an end of capacitor C 63, the other end of inductance L 3 links to each other with pin 34, and the other end of capacitor C 63 links to each other with antenna ANT1; Pin 25,27,28,29,30,31,35,36,37,38,39,40 links to each other with an end of analog circuit power supply VCC1.8, capacitor C 11, capacitor C 101, capacitor C 371, the other end ground connection of capacitor C 11, capacitor C 101, capacitor C 371.
4. a kind of outdoor wireless monitoring system of patient in hospital according to claim 1 is characterized in that the supply voltage conversion of described patient location and physiological parameter acquisition node and the circuit of detection module are: the negativing ending grounding of lithium battery and button cell; The positive pole of lithium battery links to each other with the pin of relay 5 normally opened contacts and pin 1COM end; The positive pole of button cell links to each other with the pin of relay 4 normally-closed contacts; Relay pin 3, pin 8 ground connection; Relay pin 7 normally-closed contacts meet VCC; Ground connection after the end of relay pin 10COM terminating resistor R20, the other end of resistance R 20 link to each other with an end, the pin 3 of capacitor C 16, capacitor C 9, capacitor C 17; Pin 6 normally opened contacts connect pin 4, the pin 1 of supply voltage conversion chip TPS79533, the pin 2 of physiological parameter acquisition module, an end of resistance R 21, and the other end of capacitor C 16, capacitor C 9 links to each other; The pin 1 of another termination CC2431 of resistance R 21 and an end of resistance R 22, the other end ground connection of resistance R 22; The pin 5 of TPS79533 connects the other end of capacitor C 17; The pin 4 of TPS79533 connects the positive pole of VCC and LED 1, the end of the negative pole connecting resistance R19 of LED 1, the other end ground connection of resistance R 19.
5. the patient positioning method of an outdoor wireless monitoring system of patient in hospital is characterized in that comprising the steps:
1) patient location and physiological parameter acquisition node are with the form of broadcasting, and the ZigBee wireless sensor network reference node in a jumping scope sends Location Request;
2) reference node obtains the RSSI of signals value after the request of receiving, and is designated as RSSI Blind_i, wherein i is the ZigBee short address of patient location and physiological parameter acquisition node, reference node upgrades the RSSI storehouse, in the RSSI storehouse as if there not being RSSI Blind_iClauses and subclauses are then created RSSI Blind_iClauses and subclauses are set up the formation that length is 10-20, with RSSI Blind_iValue writes head of the queue, with RSSI Blind_iValue is as RSSI Blind_iThe mean value of formation is designated as RSSI Blind_ave_i, if RSSI Blind_iLess than queue length, then directly write RSSI in the number of formation at tail of the queue Blind_iValue, and ask its mean value as RSSI Blind_ave_iValue, if RSSI Blind_iNumber reach queue length, then reject head of the queue RSSI Blind_iThe value, with head of the queue back one as new head of the queue, with up-to-date RSSI Blind_iValue writes tail of the queue, and the mean value of asking this formation is as RSSI Blind_ave_iValue, finish RSSI Blind_ave_iAfter the calculating, whether system queries starts regularly, if then reset timer, carries out timing again, if not then start timer, if timing then delete RSSI in database Blind_iClauses and subclauses;
3) according to the RSSI mean value of other node reference nodes on every side in the RSSI storehouse, be designated as RSSI Ref_ave_j, wherein j is the ZigBee short address of corresponding reference node, according to formula
Figure FSB00000462034100031
Calculate the Manhattan difference value, wherein i is for the ZigBee short address of patient location and physiological parameter acquisition node, if also there is not RSSI in the RSSI storehouse Ref_ave_jBe worth then M i=NULL;
4) reference node sends M with form all nodes in a jumping scope of broadcasting iValue and coordinate figure;
5) reference node receives M iWhen value and coordinate figure, obtain the RSSI of signals value, be designated as RSSI Ref_j, wherein j is for sending M iThe ZigBee short address of the reference node of value and coordinate figure, reference node upgrades the RSSI storehouse, if do not have RSSI in the RSSI storehouse Ref_jClauses and subclauses are then created RSSI Ref_jClauses and subclauses are set up the formation that length is 10-20, with RSSI Ref_jValue writes head of the queue, with RSSI Ref_jValue is as RSSI Ref_jThe mean value of formation is designated as RSSI Ref_ave_j, if RSSI Ref_jNumber in formation then directly writes RSSI at tail of the queue less than queue length Ref_jValue, and ask its mean value as RSSI Ref_ave_jValue, if RSSI Ref_jNumber reach queue length, then reject head of the queue RSSI Ref_jThe value, with head of the queue back one as new head of the queue, with up-to-date RSSI Ref_jValue writes tail of the queue, and the mean value of asking this formation is as RSSI Ref_ave_jValue;
6) patient location and physiological parameter acquisition node are receiving M iBehind value and the coordinate figure, according to formula ( X Manhat tan , Y Manhat tan ) = ( M 1 - α X 1 + M 2 - α X 2 + . . . . . . M N - α X N M 1 - α + M 2 - α + . . . . . . M N - α , M 1 - α Y 1 + M 2 - α Y 2 + . . . . . . M N - α Y N M 1 - α + M 2 - α + . . . . . . M N - α ) Draw the coordinate estimated value of Manhattan difference, wherein α is a weight factor, if M 1~M NValue do not have (X then Manhat tan, Y Manhat tan)=(16383.75,16383.75), after patient location and physiological parameter acquisition node RSSI value are to the received signal carried out the bound Filtering Processing, as if the number of RSSI effective value less than 3, (X then Location, Y Location)=(16383.75,16383.75), if the number of RSSI effective value is greater than 3, then these RSSI effective values are sorted, choose minimum value wherein, coordinate figure X, the Y of the information that it is corresponding and be stored in these four parameters of envirment factor A, N in the system and send among the Location Engine of patient location and physiological parameter acquisition node chip CC2431 and calculate draws the estimated value (X of current patient location and physiological parameter acquisition node coordinate Location, Y Location), drawing (X Manhat tan, Y Manhat tan) and (X Location, Y Location) back root following formula carries out data fusion,
X Est = X Manhat tan ( 1 ) X Location ( 2 ) β X Location + ( 1 - β ) X Manhat tan ( 3 ) γ X Manhat tan + ( 1 - γ ) X Location ( 4 ) 16383.75 ( 5 ) Y Est = Y Mahat tan ( 1 ) Y Location ( 2 ) β Y Location + ( 1 - β ) Y Mahat tan ( 3 ) γ Y Mahat tan + ( 1 - γ ) Y Location ( 4 ) 16383.75 ( 5 )
Wherein beta, gamma is a weight factor all, works as X LocationOr Y LocationBe worth and adopt formula (1) when invalid, work as X Manhat tanOr Y Mahat tanBe worth and adopt formula (2) when invalid, when calculating M iThe time RSSI Ref_jWhen the value number does not reach queue length or X LocationOr Y LocationValue adopts formula (3) during less than 3m, when calculating M iThe time RSSI Ref_jWhen the value number reaches queue length or X Manhat tanOr Y Mahat tanWith formula (4), work as X during greater than 3m Location, X Manhat tanOr Y Location, Y Mahat tanBe worth and adopt formula (5) when invalid, after finishing the location, locating information, physiological parameter information, warning message are sent to coordinator node by the mode of true form complement code verification, and transfer to host computer by the dual-mode wireless transmission system.
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