论文部分内容阅读
我国“北斗”卫星导航系统在建设过程中存在地面跟踪站无法全球均匀布设的问题。针对该问题,可采用依靠少量锚固站的星座自主定轨方法解决。通过推导星地测距对卫星轨道升交点赤经的偏导数,证明了星地测距对升交点赤经的可观性,并分析得出,在经度保持不变的情况下,锚固站纬度越大,星地测距对卫星轨道升交点赤经的偏导数的模越小,星地测距对升交点赤经的修正越差。其后,对单锚固站辅助导航星座自主定轨进行了仿真实验,在经度保持不变的条件下,随着纬度的增大,星座自主定轨结果的收敛速度越来越慢。仿真结果验证了理论分析,并得出锚固站纬度是影响星地测距对卫星轨道升交点修正程度的重要因素的结论。
China “Beidou ” satellite navigation system in the course of the construction of the ground tracking station can not be globally distributed problems. To solve this problem, we can use the constellation independent orbit determination method that relies on a small number of anchoring stations. By deriving the partial derivative of the right ascension of satellite orbit ascending from satellite orbit, we prove the observability of star anomaly on ascension and ascension of ascension point. The analysis shows that with longitude unchanged, The smaller the modulo of the partial derivative of the R, R and R of the ascending orbit of the satellite orbit, the worse the correction of the right ascension of the ascending node by the satellite ranging. After that, the autonomous anchoring orbit determination of single-anchorage station assisted navigation was simulated. With the longitude kept unchanged, the constringency of autonomous orbit determination became slower and slower with the increase of latitude. The simulation results verify the theoretical analysis and conclude that latitude of anchorage station is an important factor that affects the correction of satellite ascending point by the distance measurement of satellite.