正交多相码连续波主动声呐回波检测算法设计*

与常规脉冲式主动声呐相比，连续波主动声呐能够提高目标回波的时间处理增益和目标信息更新速率。本文提出一种由正交多相码合成的连续发射波形，分析了发射信号和目标回波模型，设计了多通道匹配滤波器组完成回波检测。为了进一步提高接收机检测性能，提出了多通道非相干积累的处理方法。通过数值仿真，分析提出的连续波形的多普勒分辨性能和目标信息更新率。通过蒙特卡罗法获取ROC曲线，比较了脉冲式主动声呐和连续波主动声呐在均匀混响背景下对单目标检测性能的差异。仿真结果表明，本文设计的连续波波形具有较好的多普勒分辨性能，在均匀混响背景下，回波检测算法能够明显提高单个目标的探测能力。

Design of echo detection algorithm for continuous active sonar composed of orthogonal polyphase codes

Compared with conventional pulsed active sonar (PAS), continuous active sonar (CAS) can improve the time processing gain of target echoes and target information update rate. In this paper, a continuous transmitting waveform composed of orthogonal polyphase codes is proposed, the models of the transmitting signal and target echo are analyzed, and a multi-channel matched filter bank is designed to detect echoes. In order to improve the detection performance of the receiver, a multi-channel incoherent integration method is proposed. In the simulation, the performance of Doppler resolution and target information update rate of the proposed continuous waveform are analyzed. After obtaining the ROC curves by Monte Carlo method, under the condition of uniform reverberation background, the difference of single target detection performance between PAS and CAS is compared. The simulation results show that the proposed continuous wave has good Doppler resolution, and the echo detection algorithm can significantly improve single target detection performance under the condition of uniform reverberation background.