C-W制导误差分析

The Error Analysis of C-W Guidance

以交会对接近程导引段为例,对C-W制导误差进行分析,包括非线性误差,摄动加速度误差和导航误差。利用摄动解理论,给出了在非线性误差和J2项摄动加速度作用下,摄动相对运动方程的解析形式,并利用Monte Carlo方法仿真得到导航误差对制导误差的影响。分析结果表明:非线性误差和J2项摄动是追踪器距离目标器较远时的主要影响因素,其影响随相对距离的减小而减小;而导航误差的影响只与转移时间有关,是相对距离较近时的主要影响因素。

The C-W guidance error analyses for the homing and closing phases of space rendezvous and docking（RVD） are carried out, including the nonlinear error, the disturbance acceleration error, and the navigation error. Based on the disturbance theory, the analytic solution of relative motion disturbed by the nonlinear error and the J2 disturbance is given, and the influence of navigation error is investigated through the Monte Carlo simulation. The result shows that the nonlinear error and J2 disturbance are the most important errors when the chaser is far from the target and the influences decrease with the deceasing of relative distance, but the influence of navigation error is only related to the transfer time and it is the most important error when the chaser is closed to the target.