三元相关被动测距方法探讨

提出了在被动测距声纳工作背景下的三元相关被动测距方法。通过仿真分析,比较了二元极性相关、三元极性相关和三元非极性相关法在时延估计精度和目标检测性能上的差异。仿真实验结果表明,相对于二元极性相关法,三元非极性相关法在信噪比为13dB到4dB范围内的时延准确估计概率提高了6%到14%,时延估计根方差减小了5到30个采样周期,检测性能上提高了近4 dB。但三元相关法在时延估计和目标检测上所需计算量较大,需要进一步研究相应的快速算法。

Research on passive ranging of three-element correlation

A 3-element correlation passive ranging method is put forward under the working background of passive ranging sonar. Through simulation analysis, the performances of time delay estimation and target detection are com- pared between the 2-element polarity correlation, 3-element polarity correlation method and 3-element non-polarity correlation method. According to the simulation, compared with the 2-element polarity correlation method in the cases where the SNR equals -13dB to -4dB, the 3-element non-polarity correlation method raises the percentage of correctly estimating time delay by 6% to 14%, reduces the RMSE of time delay estimate by 5 to 30 sampling periods, and gains the advantage of almost 4dB in target detection.