高轨导航接收机的时钟辅助定位算法

针对高轨卫星导航接收机接收信号弱、可用卫星少及定位精度差的问题,提出利用恒温晶振的频率稳定性抑制观测噪声,进一步改善定位精度的时钟辅助定位算法。通过区分星历星钟误差和用户测距误差在本算法中的不同传递路径,在理论上给出了算法的定位精度与星座几何构形之间的关系,并指出本算法在高轨场景下具有显著的精度优势,在低轨和地面场景下没有精度优势。仿真试验证实了算法的有效性,在典型的高轨场景下,本算法的单点定位误差仅是标准算法的1/10。

Clock-assisted localization algorithm for high orbit navigation receiver

To solve the problems of weak signal received, few available satellites and poor positioning accuracy of high-orbit satellite navigation receiver, this paper proposes a clock-assisted positioning algorithm which uses the frequency stability of constant temperature crystal oscillator to suppress observation noise and furthermore to improve positioning accuracy. By distinguishing the different transmission paths of ephemeris clock error and user ranging error in the algorithm, the relationship between the positioning accuracy of the algorithm and the constellation geometry is given theoretically. It is pointed out that the algorithm has a significant accuracy advantage in the high orbit scene, but has no accuracy advantage in the low-orbit and the ground scenery. Simulation experiments in this paper prove the effectiveness of the proposed algorithm. In typical high-orbit scenarios, the single point positioning error of the proposed algorithm is only 1/10 of the standard algorithm.