交会对接远距离导引精度分析

为确定交会对接任务地面远距离导引控制可达到的精度,分析了影响精度的误差因素;提出了利用简化动力学模型、采用拟平均根数法和协方差法进行误差传播计算的方法;推导了误差传播和误差分析数学模型;进行了仿真计算.结果表明:远距离导引终点精度主要由传播误差决定,在一定初始条件下,当外推时间小于6 h时,终点位置精度可达到2~5 km,速度精度可达到2~3 m/s;误差传播中,沿迹和径向误差因素占主要成份,且随外推时间增加沿迹误差影响逐渐增大;终点精度的提高应从抑制沿迹、径向误差着手.提出的地面导引控制精度分析方法综合考虑了各种误差因素,计算便捷,适用于工程方案设计阶段的精度分析与估计. 

Precision analysis of long distance navigation of rendezvous

To get performance of attainable end point accuracy of long range navigation, error factors influencing precision were analyzed, and a precision analyzing method using simplified dynamical model together with quasi-mean element and covariance method was put forward, mathematical models of error propagating and analyzing were deduced, simulation was carried out based on mathematical models presented. The results show that end point accuracy of long range navigation is mainly affected by error propagation, and that position and velocity errorscan be controlled below 5 km and 3 m/s respectively under certain initial circumstances when propagating time is less than 6 h. Along-track error and radial error are main error factors in error propagating and along-track error becomes larger as propagating time becomes longer, therefore improving end point accuracy along-track error and radial error must be mainly restrained. Accuracy analyzing method introduced above considers comprehensively various error factors and is convenient and quick. It is suitable for engineering utilizing in scheme design phase.