基于轨道动态模型的星间链路测距随机误差测试方法

Random Error Test Method of Inter-satellite Link Rangings Based on Orbit Dynamic Model

在轨道动态条件下卫星相对运动中细微的时间检测偏差将导致测距误差大幅增加,因此精确地测量此时卫星的相对距离准确度(即测距随机误差)是卫星测距功能地面测试的难点。文章提出距离动态情况下星间链路测距随机误差的测试方法,即建立轨道动态模型模拟在轨卫星动态工作场景,分析卫星地面测距模拟理论值的准确度影响,得到被测卫星的星间测距随机误差计算方法。对星间链路实测测距值进行测试及验证,测距随机误差低至0.027 m,与星间链路实测数据吻合较好,获得了轨道动态条件下星间测距随机误差更真实的测试结果。

The slight time detecting deviation of satellite relative motion will lead to a large increase in the ranging error under orbit dynamics.Therefore,precisely measuring the accuracy of the relative distance between satellites at this moment is the difficulty of satellite ranging test on ground.A testing method of measuring the random error of distance measurement for inter-satellite link under dynamic range is proposed.A dynamic orbit model is established to simulate the dynamic working scene of the satellite in orbit.The influence of the theoretical value of the satellite ground ranging simulation on accuracy is analyzed.The method of calculating the random error of distance measurement is obtained.The measured distance values of inter-satellite links are tested and verified,and the random ranging error is as low as 0.027m.The result matches the data of the inter-satellite link preferably,which is a more accurate test result of the random error of inter-satellite ranging under orbit dynamics.