偽衛(wèi)星網(wǎng)絡(luò)定位算法研究
[Abstract]:Beidou Satellite Navigation system (BDS) is an all-weather regional satellite navigation system developed in China. Beidou system and other similar GNSS are already the best way to obtain navigation information on land, sea and sky, and play a more and more important role. However, due to the limitation of the BDS/GNSS signal itself and the increasingly diversified demand for location information, it is not possible to meet the location requirements in the areas where the indoor location, valley, tunnel and other signals are occluded. Pseudo-satellite system, as a GNSS enhancement system, can solve this problem. It can not only provide additional GNSS-like signals, but also provide independent network positioning in areas without GNSS signals. Moreover, the addition of pseudo-satellite makes it possible to use carrier phase measurement for precise positioning, so that the positioning accuracy of the system can reach centimeter level. In order to track and study the advanced research results in the field of pseudosatellite at home and abroad, the main contents of this paper are as follows. Firstly, through summarizing the research status of pseudo-satellite technology at home and abroad, and combining with the analysis of Beidou system, this paper expounds the working principle of Beidou pseudo-satellite system in detail, and designs the signal system and navigation message among them. In addition, the key technologies of Beidou pseudo-satellite system, such as time synchronization, integer ambiguity resolution, nonlinear filtering, network layout and so on, are also analyzed. Secondly, the influence of pseudo-satellite geometric structure on its positioning performance is analyzed, and the precision factor, which is an index to evaluate its geometric structure, is demonstrated in detail. In this paper, the enhancement principle of pseudo-satellite to Beidou is analyzed theoretically, and the precision factor is simulated and analyzed with the data of Beidou ephemeris. Thirdly, the effects of near-far effect and multi-path effect on the location of pseudo-satellite are discussed, and the precision factor is taken as an index when these factors are taken into account. In this paper, an adaptive genetic algorithm combined with penalty factor is proposed to optimize the placement of pseudo-satellites. The results show that the proposed method can be used to optimize the pseudo-satellite layout under multiple constraints, and the adaptive genetic algorithm has more advantages in the convergence rate. Finally, the influence of linearization error on Beidou system and pseudo-satellite system is analyzed. Combined with the analysis of the source of linearization error, the extended Kalman filter, the second-order extended Kalman filter and the unscented Kalman filter are simulated in Beidou system and Beidou pseudo-satellite system respectively. The positioning accuracy of the three methods is compared. The results show that when the pseudo-satellite is close to the receiver and the pseudo-satellite layout is not good, the nonlinear degree of the system is greater, and the UKF can provide better positioning accuracy. However, when the constellation is far away from the receiver, EKF,EKF-2,UKF has an approximate positioning accuracy.
【學(xué)位授予單位】:西南交通大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:TN967.1
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