面向測距與通信性能優(yōu)化的衛(wèi)星導(dǎo)航星間鏈路組網(wǎng)技術(shù)研究
[Abstract]:Intersatellite link is an important part of satellite navigation system. The networking technology is the key technology of intersatellite link. It is necessary to study the intersatellite link networking technology from the angle of intersatellite ranging and communication performance optimization. Two types of intersatellite antenna can be used in the intersatellite link, which are wide beam and dot beam. The networking technology has different characteristics under the two kinds of antenna forms. The mode of operation of intersatellite link is gradually developing from single autonomous navigation to integrated satellite and earth data transmission and orbit determination. The intersatellite link networking technology is required to optimize the performance of satellite and ground joint operation. In this context, the following four aspects of the research work are carried out in this paper: (1) the existing mesh link allocation methods for spot beam intersatellite links do not optimize the performance of intersatellite ranging and communication. In this paper, a link allocation method is proposed, which is based on the weight of the geometric precision factor of the whole network average observation and the average transmission delay of the whole network. The analysis and simulation results show that the proposed link allocation method is superior to the mesh link allocation method in the performance of intersatellite ranging and communication. The average geometric precision factor of the whole network can be reduced from 3.06 to 1.34 when every five constellation network topologies are allocated to calculate the link cost once. The average point-to-point transmission delay of the whole network is slightly reduced from 218ms to 211ms.2.In view of the lack of link anomaly detection method for intersatellite links, the problem of routing transmission under the condition of link interruption cannot be effectively solved. A robust routing algorithm based on link interrupt detection and K short path is proposed. The analysis and simulation results show that the proposed survivability routing algorithm can only increase 1 hop transmission when the link is interrupted. (3) for the existing intersatellite link of the wide beam time division system, the geometry structure of the existing polling time division ranging system is not optimized enough, which restricts the improvement of the precision of joint orbit determination. A packet time division ranging scheme and a satellite grouping algorithm based on the minimum geometric precision factor of the whole network average observation are proposed. The results of analysis and simulation show that the combined orbit determination accuracy of grouping time division ranging system is obviously better than that of polling time division ranging system. When the mean error is 0.6 m and the standard deviation is 0.3 m, the normal distribution error model is obtained. The precision of joint orbit determination can be improved from 2.45 m to 1.26 m under the optimal satellite packet condition. (4) in view of the lack of effective methods for analyzing the interference of satellite navigation inter-satellite link in the whole network at present, the precision of orbit determination can be improved from 2.45 m to 1.26 m. In this paper, a method for evaluating the impact of whole network interference is proposed, which takes both orbit determination and communication performance into account. The results of analysis and simulation show that the loss of orbit determination accuracy of the whole network can effectively measure the number of jammed satellites, and the interdiction rate of the whole network and the increment of the average link transmission delay of the whole network can effectively measure the importance of the jammed satellites in the network. According to the results of interference effect analysis, the security protection strategy should be adopted in intersatellite link from the angle of intersatellite link operation mode anti-jamming. The research results of this paper have been applied to the system demonstration and equipment development of the intersatellite link of autonomous satellite navigation system in China.
【學(xué)位授予單位】:國防科學(xué)技術(shù)大學(xué)
【學(xué)位級別】:博士
【學(xué)位授予年份】:2014
【分類號】:TN967.1
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