CAJ | 학술논문

浅海主动声纳检测与估计面临的主要问题是不确实浅海信道导致的回波信号不确实和混响干扰.为此,本文提出一种子空间回波信号的恒虚警(CFAR)检测与估计方法:对不确实浅海波导中的回波信号采用子空间信号建模方法;将混响干扰建模为一种类信号干扰,基于广义似然比检验(GLRT)的思想,将混响相关矩阵的最大似然估计代入到似然比检测中,由于GLRT具有恒虚警特性,最终得到子空间回波信号的恒虚警检测器.通过仿真和实际数据处理分析表明,这种子空间回波信号恒虚警检测器对不确实信道具有很好的相干匹配能力,对信道不确实性具有较好的宽容性,能得到较好的脉冲压缩效果,提高目标位置估计精度.较之常规匹配滤波器,其检测性能可提高1～2.5 dB.
천해주동성납검측여고계면림적주요문제시불학실천해신도도치적회파신호불학실화혼향간우.위차,본문제출일충자공간회파신호적항허경(CFAR)검측여고계방법:대불학실천해파도중적회파신호채용자공간신호건모방법;장혼향간우건모위일충류신호간우,기우엄의사연비검험(GLRT)적사상,장혼향상관구진적최대사연고계대입도사연비검측중,유우GLRT구유항허경특성,최종득도자공간회파신호적항허경검측기.통과방진화실제수거처리분석표명,저충자공간회파신호항허경검측기대불학실신도구유흔호적상간필배능력,대신도불학실성구유교호적관용성,능득도교호적맥충압축효과,제고목표위치고계정도.교지상규필배려파기,기검측성능가제고1～2.5 dB.
The troubles of active sonar faced in the uncertain shallow water waveguide mainly are echo uncertainty and reverberation interference.So a detecting and estimating method by a constant false alarm rate(CFAR)detector for subspace echo was presented.The CFAR detector was structured by the generalized likelihood ratio test(GLRT)theory under the conditions that the echo was modeled as a subspace signal,the reverberation interference was modeled as a like signal one,and the maximum likelihood estimation of the reverberation correlation matrix was substituted into likelihood ratio test. The processed results to the simulated data and the real ones show that the CFAR detector has better coherent matching ability to the uncertain channel,better tolerance to the channel uncertainty,by which the better pulse compression effect can be obtained,the target position estimation precision can be improved,and the detection performance can be improved by 1-2.5 dB compared with the conventional matching filter.