耦合浅海声信道目标回波建模与检测性能分析

Modeling and detection performance analysis of target echoes coupled with shallow water acoustic channels

为提高浅海扩展目标回波检测性能,基于浅海声信道模型和多亮点模型,建立了耦合浅海声信道扩展目标回波模型,并基于副本相关积分(RCI)检测理论对浅海多亮点目标回波RCI检测进行了理论推导。采用带宽分别为50 Hz,100 Hz,500 Hz,1000 Hz的线性调频信号,仿真分析了不同浅海环境下的RCI检测性能。结果表明,海深、声呐深度、目标位置和波形带宽都会影响浅海目标回波扩展特性和RCI检测性能,合适的声呐深度和波形带宽有利于提高浅海扩展目标检测性能。

To improve the detection performance of extended targets in shallow water,the model of extended target echoes coupled with shallow water acoustic channels is modeled using the shallow water acoustic channel model and the multi-highlight model.The theoretical results of replica correlation integration(RCI)detection for extended target echoes coupled with shallow water acoustic channels are provided.The RCI detection performances under different shallow water conditions are analyzed by simulation methods using the linear frequency modulation(LFM)waveform with the bandwidth being 50 Hz,100 Hz,500 Hz and 1000 Hz respectively.The results show that the sea depth,the sonar depth,the target position and the waveform bandwidth all have influences on the expansion characteristics and the RCI detection performances of shallow water target echoes.The suitable sonar depth and waveform bandwidth may improve the detection performance of extended targets in shallow water.