航天器工程2024，Vol.33Issue(4)：18-24,7.DOI:10.3969/j.issn.1673-8748.2024.04.003
基于月球掩星观测的星上全自主校时方法
On-board Autonomous Time Calibration Method Based on Lunar Occultation Obsercations
侯祥震 1刘玥 1付凯林 1钱霙婧2
作者信息
- 1. 航天东方红卫星有限公司,北京 100094
- 2. 北京工业大学,北京 100060
- 折叠
摘要
Abstract
The autonomous planning and scheduling of the satellite is highly dependent on In re-sponse to the dependence of existing autonomous mission planning and navigation on the accuracy of the on-board clock,as well as the current situation where satellites widely needs to be calibra-ted by the external information such as Global Navigation Satellite System(GNSS)or ground time service system.This paper proposes a method to measure Lunar Occultation using on-board attitude sensor,retrieve the exact time of occultation according to the on-board high-precision star catalogue,and then correct the on-board clock to provide a high precision time reference for autonomous navigation and autonomous mission planning.Firstly,the time series of occultation events and the least square algorithm for the deviation of observation time are deduced,and the calculation method of time checking correction based on genetic algorithm is proposed.Secondly,the detectability of occultation events is simulated and analyzed.Finally,the effectiveness of the on-board autonomous time calibration simulation system based on genetic algorithm is verified by simulation.The simulation results show that the clock calibration method is effective and feasi-ble,and the deviation is better than 0.005s,which can be used as a backup means for satellite calibration in projects such as micro-satellite and deep space exploration.关键词
月球掩星/时间序列/最小二乘法/遗传算法/星上自主校时Key words
lunar occultation/time series/least square algorithm/genetic algorithm/on-board au-tonomous time calibration分类
航空航天引用本文复制引用
侯祥震,刘玥,付凯林,钱霙婧..基于月球掩星观测的星上全自主校时方法[J].航天器工程,2024,33(4):18-24,7.
