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- 2017
基于X射线脉冲星的环火探测器同步定位和授时仿真分析
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Abstract:
利用X射线脉冲星观测量不仅能够为深空探测器提供稳定可靠的位置、速度和姿态信息，还能够对探测器上的原子钟进行长期误差校正。火星探测任务中，存在探测器飞行时间长，钟差随时间累积严重降低脉冲星自主定位系统的精度等问题。针对此，提出了一种环火探测器同步定位和授时方法，对钟差进行建模，将钟差模型参数纳入到滤波系统中，利用自适应扩展卡尔曼滤波器同时计算探测器的位置、速度和钟差模型参数。仿真实验表明，经滤波校正后的钟差保持在300 ns以内，探测器的位置和速度精度分别优于200 m和0.03 m/s，精度得到明显改善
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