基于相关匹配的弹道中段目标章动角估计  

Nutation Angle Estimation of Ballistic Target in Midcourse Based on Correlation Matching

作　　者：肖立[1] 周剑雄[1] 卢再奇[1] 陈光辉[2] 

机构地区：[1]国防科技大学ATR实验室,长沙410073 [2]白城兵器试验中心技术部,白城137001

出　　处：《宇航学报》2010年第12期2635-2643,共9页Journal of Astronautics

基　　金：国家973计划(6136002)

摘　　要：章动角是弹道中段目标的重要进动特征,可用于识别弹头和诱饵。首先提出了基于相关匹配的章动角估计方法,将观测的目标雷达截面积(RCS)序列与不同参数下的RCS序列模板进行相关匹配,搜索匹配函数的最大值,从而得到章动角的估计值。然后给出了具体的实现算法,将初始时刻的采样间隔设置为脉冲重复周期(PRI)的整数倍或1/K(K为整数,且K≥2),在此基础上减少了匹配函数的计算量,并且可通过单层或多层相关匹配来估计章动角。仿真结果表明,由于RCS测量存在系统误差,相关匹配的章动角估计性能远优于最小二乘匹配。同时分析了全姿态RCS数据的角度采样间隔对相关匹配估计性能的影响。最后比较了多层相关匹配和单层相关匹配的估计性能和计算量。The nutation angle is an important precession characteristic of a ballistic target in midcourse,and can be used to discriminate between warheads and decoys.A correlation matching based nutation angle estimation method is proposed.The measured radar cross section（RCS）series of the target is matched with the RCS series templates with different parameters,and then the nutation angle is estimated by searching for the maximum value of the matching function.Also the implementation of the proposed method is detailed.The computational burden of the matching function is decreased by selecting an integer multiple or 1/K（where K is an integer,and K≥2）of the pulse repetition interval（PRI）as the sampling interval of the initial time and the nutation angle can be estimated by using one-stage or multi-stage correlation matching.Simulation results show that the nutation angle estimation performance of the correlation matching is far superior to that of the least square matching in the presence of systematic errors in the RCS measurement.In addition,the angle sampling interval for the all-attitude RCS data can affect the estimation performance of the correlation matching,and its effect is analyzed.Finally,the estimation performance and computational burden of the multi-stage correlation matching is compared with that of the one-stage correlation matching.

关 键 词：运动估计 模板匹配 相关法 导弹 雷达截面积 

分 类 号：TN957.52[电子电信—信号与信息处理]