基于星地/星间联合观测的时间比对方法

Time Synchronization Method base on Combined Satellite-Ground and Inter-satellite Observation

星间观测实现了移动卫星的连续跟踪,是提升卫星钟时间比对精度的重要手段。研究了基于星地/星间联合观测时间比对技术;推导了星地/星间时间同步比对模型;给出了星间钟差到星地钟差的一致性归算方法。理论上加入星间观测移动卫星钟差预报精度能大幅提升,但异质观测设备导致钟差观测序列不连续,影响了卫星钟预报精度。研究了小幅钟差跳变的探测与补偿技术,提出了基于传统粗差探测与相邻历元组差相结合的钟差跳变探测方法,有效消除了异质观测设备带来的钟差不一致性,提升了卫星钟预报精度。最后利用实测与仿真数据验证了所提出的理论和方法的正确性和有效性。

Inter-satellite observations realize continuous tracing for mobile satellites,to enhance accuracy of satellite clock comparisons.This paper focuses on time comparison technology combining satellite-ground and Inter-satellite observations,and derives a time comparison model for satellite-ground and inter-satellite observations.It details a method to calculate satellite-ground clock error from intersatellite clock error.Theoretically,the prediction accuracy of mobile satellite clocks can be greatly enhanced after adding inter-satellite clock error.However,the heterogeneous nature of observation devices results in a discontinuity in the sequence of clocks,which affects the prediction accuracy of satellite clocks.We research a detection and compensation technology for slight jump clock error,and propose a combined method with traditional gross error detection and subtraction adjacent epochs,which can eliminate the heterogeneous clock errors caused by inconsistent observation equipment to enhance prediction accuracy.An experiment with real and simulation data verified the validity and effectiveness for the proposed theories and methods.