北斗接收機基帶信號處理算法關鍵技術研究
[Abstract]:At present, with the rapid development of global satellite navigation system (GNSS,Global Navigation Satellite System), it has become an important battlefield of space territory, scientific and technological level and military game between developed and some developing countries, the GPS (Global Positioning System), of the United States Russia's GLONASS, Europe's GALILEO, China's Beidou Satellite Navigation system (BeiDou Navigation Satellite System) plays an important role in GNSS. After considerable development, Beidou system has now developed to realize the positioning of the Asia-Pacific region, navigation and short message communication coverage, providing a variety of user experiences for authorized and open users. Support a large number of users to achieve more sophisticated positioning and navigation services, and plans to achieve global coverage by 2020. However, with the increasing number of service areas, the increasing requirements of users for positioning and navigation accuracy and speed, and the increasing number of harsh environments for receivers, all provide important opportunities for the development of each system, and also bring great challenges to the development of each system. Therefore, studying the baseband signal processing algorithm of the positioning and navigation receiver, and improving the performance of the positioning and navigation of the receiver has important practical significance and huge development space. Beidou receiver is an important platform of Beidou system at the client end. When the user receives the satellite signal, finally completes the positioning and navigation solution, generates the positioning and navigation data or completes other auxiliary functions, it is realized at the receiver level. In the continuous optimization and development of each system, the navigation and positioning performance is improved, and the commonly used improved signal system method involves global planning, which is difficult to realize; the optimization of antenna location is greatly affected by the terrain; and the innovative antenna design brings greater hardware loss. In this paper, the optimization and improvement of acquisition and tracking two important signal processing processes in Beidou receiver baseband signal processing are studied. The positioning principle, signal composition, system composition and receiver working principle of Beidou system are analyzed in detail. The acquisition principle of Beidou receiver and the research status in the field of acquisition at home and abroad. In view of the influence of many interference signals in urban environment on the acquisition of satellite signals by Beidou system, this paper presents an anti-jamming acquisition algorithm for Beidou system based on wavelet transform. The Meyer wavelet is used to decompose, and then the energy of each band is compared. The frequency band of narrow band noise is determined by comparing the results, and the coefficients of the band of noise are attenuated. Finally, the signal is reconstructed to eliminate the narrowband interference. The simulation results show that the proposed method can resist narrow band continuous wave interference in the case of a single antenna, and the acquisition gain of the receiver can be increased by 5 dB on average. At the same time, aiming at the narrow street environment with high buildings in the city, the Beidou receiver is often blocked from receiving satellite signals, which leads to the problem that the tracking loop is out of lock and the navigation data can not be solved normally. In this paper, a vector tracking algorithm based on the improved extended Kalman filter is proposed. By coupling the signal characteristics of each channel, strong signal-assisted weak signal tracking is realized. Thus, when the satellite signal is occluded, the location is still more accurate. Experimental results show that when the number of visible stars received by the Beidou receiver is less than 4 in the urban street environment, the algorithm in this paper can still achieve more accurate positioning. In this paper, in improving the receiver baseband signal processing level, the acquisition and tracking processes are distinguished, and the optimization and improvement of each process algorithm is given. Without increasing the hardware loss and the complexity of the algorithm, the speed and accuracy of the positioning solution of the receiver are improved, which provides some reference for the software optimization of the Beidou receiver.
【學位授予單位】:太原理工大學
【學位級別】:碩士
【學位授予年份】:2016
【分類號】:TN967.1
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