基于多重交叉残差方法的空间目标旋转特性分析

针对传统的频谱分析和自相关函数反演周期时常出现虚假周期的问题，提出了多重交叉残差法处理空间旋转目标雷达散射截面(Radar Cross Section，RCS)的时间序列。以空间跟踪和监视系统(Space Tracking and Surveillance System,STSS)卫星为例，仿真了空间目标失稳旋转状态，对比了频谱分析、自相关函数和多重交叉残差3种方法的处理结果，发现当目标存在进动运动时多重交叉残差法抗干扰能力更强。在此基础上，进一步研究了不同章动角时多重交叉残差法对旋转周期的反演效果，结果表明章动角大小会影响旋转周期的反演准确度，且章动角达到一定数值后，卫星进动幅度过大导致RCS序列周期性模糊，无法用多重交叉残差法反演出旋转周期。

Rotation property analysis of space target based on multiple cross-residue

In retrieving period based on spectrum analysis and autocorrelation function,false periods often occur.In allusion to this problem,the multiple cross-residue method is proposed to process radar cross section(RCS) sequence of rotating space target.Instability rotating state of the Space Tracking and Surveillance System(STSS) satellite is simulated and RCS data is generated by a fast algorithm based on improved Gordon equation.Comparison of the processing effect of spectrum analysis,autocorrelation function and multiple cross-residue indicates that,without precession,treatment effect of the three methods is similar,but multiple cross-residue has stronger anti-interference ability when precession exists.On this basis,considering different nutation angle,further research on retrieving effect of multiple cross-residue is carried out.The simulation results proclaim that retrieving accuracy is affected by the value of nutation angle.When nutation angle exceeds a certain value,RCS sequence will become fuzzy and rotation period can not be retrieved with multiple cross-residue.