一种有效的RGPO干扰鉴别算法及性能分析

本文研究目标跟踪时的距离门后拖(RGPO)干扰鉴别问题,分析了现有χ²检验算法的不足,在χ²检验算法的基础上,提出了一种采用信号似然比预处理和移位寄存器后处理相结合的鉴别算法,称之为Chi+SLR+register算法.该算法在最佳寄存器长度下,能使误判概率最小.在相当宽的寄存器长度范围内,该算法都有很好的鉴别性能.此外,该算法在有SOJ干扰时,也能保持高的鉴别率,因而是一种更有效的RGPO干扰鉴别算法.

An Effective Algorithm for Discriminating RGPO with Performance Analysis

Range-Gate-Pull-Off (RGPO) is a common type of electronic countermeasure (ECM) technique used to defeat or degrade tracking radars.The RGPO goal is to generate an ECM pulse that is a replica of the radar transmitted pulse with delay and amplification so as to pull the radar range gate off the target.Although a chi-square test algorithm for rejecting RGPO false targets has been proposed,it has low RGPO discrimination ratio and more error decisions in the absence of RGPO.To overcome its shortcomings,a new algorithm named as Chi SLR register is presented,which integrates the chi-square algorithm with a shift register and a signal likelihood ratio (SLR) test.This new algorithm has minimum probability of error decisions in specific length of shift register,and better performance than other algorithms in wide scope length of shift register.Additionally,the new algorithm is also effective in SOJ environment.