北斗接收機(jī)跟蹤環(huán)路設(shè)計及組網(wǎng)應(yīng)用研究
[Abstract]:Beidou Satellite Navigation system is a global satellite navigation system developed by China. It can provide high precision, high reliability positioning, navigation, timing and other services to large scale users all the time. And has the ability of short message communication. According to the existing strategic deployment and planning, it is expected that China will complete the overall constellation construction with 35 "Beidou second generation" navigation satellites as the main body in 2020 or so. As a carrier of satellite signal processing, Beidou receiver is indispensable and significant in the demodulation process of positioning information. It not only closely connects with the user experience, but also provides a lot of reference suggestions for the function optimization of Beidou system. Based on the introduction of Beidou satellite navigation system and the working principle of Beidou receiver, this paper mainly includes two aspects: the first is the improvement and design of Beidou receiver tracking loop; The second aspect is the application research of Beidou receiver networking. In the operation of the baseband digital processing module of the Beidou receiver, the satellite multipath signal will make the ranging code and navigation data modulated on the navigation signal distorted, resulting in the distortion of the carrier phase and the quality of the measurement data. Even cause receiver loop to lose lock. In order to solve the problem of satellite multipath interference in special environment, the design idea of cyclic tracking loop is presented. The satellite signal received by receiver is processed by RF front-end processing and digital down-conversion processing to obtain satellite intermediate frequency signal. In the baseband signal processing module, the satellite multipath signal is suppressed by the mechanism of secondary tracking, and the positioning accuracy of the receiver is improved. At the same time, combining the advantages of scalar tracking algorithm and vector tracking algorithm, a design of Beidou receiver tracking loop based on scalar and vector architecture is proposed. The output information of vector tracking part is defined as the main information and the scalar output is defined as auxiliary information. Then the main information and the auxiliary information are input into the discriminator together, and the discriminant judgment operation is carried out, and the output information is solved by using the extended Kalman filter algorithm, which effectively improves the working performance of the loop. In the research of receiver networking application, using the principle of group intelligence perception and the method of information sharing, a simple network method of Beidou receiver based on cloud data processing is proposed, which can improve the positioning accuracy of the location receiver while sharing information.
【學(xué)位授予單位】:太原理工大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TN967.1
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