導(dǎo)航定位數(shù)據(jù)無線傳輸系統(tǒng)的研究與設(shè)計
[Abstract]:With the development of positioning technology and the increase of social demand, more and more fields need to locate moving targets, such as people or vehicles. In order to achieve this goal, it is necessary to combine satellite positioning technology with wireless communication technology. Most of the common positioning systems use GSM/GPRS technology as the communication platform to send location data. China has a vast territory and complex terrain. In some remote mountain areas, pastoral areas, deserts, islands and other places will still exist in the GSM/GPRS mobile communication network signal coverage, with the social and economic development needs increased, more and more people will work in these areas. And in these relatively harsh areas of the work, also prone to danger or loss of direction. Due to the lack of mobile network signal coverage, search and rescue work is also facing challenges. In order to solve the problem of finding lost persons in areas without mobile network signal coverage, this paper designs a wireless data transmission system based on Beidou location, which consists of two parts: mobile user and base station. The mobile client mainly consists of the Beidou location module and the radio frequency transceiver module CC1101 under the 433MHz band to realize the function of locating and sending the location information to the base station. The base station is mainly composed of CC1101 RF transceiver module and PC machine, which is used to receive and display the location information of mobile client. First of all, this paper analyzes the principle of Beidou satellite positioning and radio frequency communication technology, and selects the research group based on the RF signal processing chip developed by ourselves. With the digital baseband signal processing chip ARK669 developed a GPS/ Beidou dual-mode dual-frequency location module to achieve the Beidou positioning function; At the same time, the hardware circuit of RF transceiver module is designed, including Barron circuit, single-end filter circuit and power amplifier circuit. The MSP430F169 produced by Texas Instruments is selected as the control core of the system, and the main control circuit is designed, including reset circuit, crystal oscillator circuit, JTAG download circuit and serial communication circuit, and the power supply module circuit is designed according to the demand of the system. The PCB of RF transceiver module is designed. Secondly, the software of the wireless transmission system is designed. The communication protocol of time division multiple access (TDMA) is used in the whole system. The base station search terminal is the host, and the mobile user terminal is the slave. The host computer sets 3 seconds as a period for collecting positioning information. In the period, the host sends paging information and receives the location information sent by each slave. In each cycle, each slave is assigned different time periods to communicate with the host. The RS-232C interface is used to communicate between host computer and PC, and the display interface is designed by MSComm serial communication control of Visual Studio2010 software. Finally, the function of the whole system is tested, and the wireless transmission distance of RF transceiver module is tested and analyzed. The test results show that within the range of 1.3KM, the system can transmit the location information without the coverage of mobile network signal, and help the search function.
【學(xué)位授予單位】:山東大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TN92
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