日凌对转发式卫星测定轨的影响研究

发布时间：2018-05-16 21:29

本文选题：日凌 + 转发式卫星测距　；参考：《中国科学院研究生院（国家授时中心）》2013年硕士论文

【摘要】：与自然卫星一样，人造卫星也存在特殊天象，日凌就是其中一种。日凌发生期间，，卫星和太阳同时出现在在地面天线主瓣宽度内，太阳产生的宽频电磁波进入天线的波束范围内，形成巨大的噪音干扰，从而严重干扰天线接收卫星信号。对于转发式卫星测距系统这种高精度的基于双向时间比对的测距系统，日凌会对其观测结果造成一定程度的影响。本文设计并实现了基于高精度DE405历表的日凌时间计算程序。并根据此程序计算日凌发生时间，分析日凌对测距数据的影响及其对GEO卫星定轨结果的影响。得到以下结论：日凌对于测轨结果主要表现为噪声影响，通信信道中噪声增加使得信噪比下降而造成的接收数据误差，表现为接收数据中出现明显跳变和较多野值，日凌噪声误差对不同测站的影响不同，这与测站的分布有关。在现有转发式卫星测距系统的四个测站中，受影响最大的是昆明站，昆明站受影响的总体时间虽然短，但是相比其他测站受影响的强度较大，且每天受影响的差别不大。其次是西安站，西安站受影响的时间较昆明站长，但是有明显的随时间变化逐渐增大然后再减小的过程，且西安站地理经度接近1号星星下点经度，所以西安1号卫星受日凌影响的强度大于4号卫星受日凌影响的强度。喀什站的地理位置较为特殊，其地理经度接近4号卫星的星下点经度。对喀什站来说，4号卫星受日凌影响的强度大于1号卫星受日凌影响的强度。长春站因为地理位置因素影响是四个站中受日凌影响最小的测站。定轨结果受日凌影响从RTN三个方向来说，N方向受到的影响最大。
[Abstract]:Like natural satellites, satellites have special celestial phenomena, such as solar transit. During the solar transit, the satellite and the sun appear simultaneously in the width of the main lobe of the ground antenna, and the wide-band electromagnetic wave generated by the sun enters the antenna beam, resulting in a huge noise interference, which seriously interferes with the antenna receiving the satellite signal. For the high precision ranging system based on bidirectional time comparison, the transit of sun will affect the observation results to a certain extent. In this paper, a program for calculating transit time based on high precision DE405 calendar is designed and implemented. According to the program, the influence of the transit on the ranging data and the orbit determination results of GEO satellite is analyzed. The following conclusions are obtained: the effect of sun-transit on orbit measurement is mainly noise, and the error of receiving data caused by the increase of noise in the communication channel is caused by the decrease of signal-to-noise ratio, which is manifested by the obvious jump and more outliers in the received data. The effect of sunstroke noise error on different stations is different, which is related to the distribution of the stations. Kunming station is the most affected among the four stations of the existing transponder satellite ranging system. Although the total time of Kunming station is short, the influence intensity of Kunming station is larger than that of other stations, and the difference is not obvious every day. The second is Xi'an station. Xi'an station is affected by more time than Kunming station master, but there is an obvious process of increasing gradually with time and then decreasing, and the geographical longitude of Xi'an station is close to the longitude under star No. 1. Therefore, the intensity of Xi'an 1 satellite affected by solar transit is greater than that of 4 satellite. The geographical longitude of Kashi station is close to the subsatellite longitude of satellite 4. For Kashi station, the intensity of 4 satellite affected by solar transit is greater than that of 1 satellite. Changchun station is the least affected by solar transit among the four stations because of geographical location. The orbit determination results are most affected by solar transit from the three directions of RTN.
【学位授予单位】：中国科学院研究生院（国家授时中心）
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：P228

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