Research And Design Of Wireless Transmission System For Navigation And Positioning Data

With the development of positioning technology and rising social demand,more and more fields need navigation for moving targets such as individuals or vehicles.In order to achieve this goal,satellite positioning technology and wireless communication technology need to be combined.A typical positioning system usually uses GSM/GPRS technology as the communication platform to transmit positioning data.China is a vast territory with complex terrain,there are remote regions without GSM/GPRS coverage,such as mountainous area,pastoral area,deserts,islands and so on.With improvements of social and economic development demands,more and more people will work in these area,it is difficult to locate and rescue people when they are lost or at risk.To solve this problem,a system which combines navigation and positioning data wireless transmission is designed in this thesis.The system is comprised of mobile subscriber terminal and base station.Mobile subscriber terminal is composed of Beidou positioning module and RF transceiver CC1101,its function is realize positioning and positioning data transmission.Base station is composed of RF transceiver CC1101 and display terminal to realize the function that receive and display positioning data from mobile subscriber terminal.Firstly,the thesis introduces principles of BeiDou satellite positioning technology and RF communication technology.The mobile subscriber terminal uses the homebrew GPS/BeiDou positioning module which is composed of homebrew RF signal processing chip and commercial baseband signal processing chip ARK669 and some other peripheral components.Hardware circuit of RF transceiver module is designed,including BALUN circuit,single-ended filter and power amplifier.MSP430F169 is chosen as the MCU of the system,and control circuit is designed,which includes reset circuit,crystal oscillator circuit,JTAG download circuit and serial communication circuit.Power Module is designed according to system requirements.PCB of RF transceiver is designed.Secondly,program of the search and rescue system is designed.The base station is the host,and the mobile subscriber terminal is the client,the host sends command and receives positioning data from client in a 3 seconds cycle.Thirdly,thesis test the function of the search and rescue system and the distance of the RF transceiver module.The result shows that this system can realize positioning and transmission function within the scope of 1.3KM and the system can complete the task that searching and rescuing people who is in risk or lost in area without GSM/GPSRS signal?...