浅水环境鱼雷声自导波形设计与分析

Waveform Design and Analysis of Torpedo Acoustic Homing in Shallow Water

波形设计作为鱼雷主动声自导设计的三大要素之一,直接决定了鱼雷主动声自导系统的抗混响能力及精确参数估计能力。文中以模糊度函数为分析工具,通过数值仿真详细对比分析了LFM、伪随机二相编码信号及Costas信号等3种典型宽带波形的抗混响能力、距离及速度分辨能力。仿真结果表明,相同带宽和时宽参数下,伪随机二相编码信号具有最优的抗混响性能、距离及速度联合分辨性能,适用于浅水环境下低速目标的检测和目标识别。文中的研究可为鱼雷主动声自导波形设计提供参考。

As one of three major design factors of a torpedo active acoustic homing system, waveform design determines the anti-reverberation capability and accurate parameter estimation of the torpedo active acoustic homing system. In this study, ambiguity function is adapted to analyze the anti-reverberation capability, range and velocity resolution of three typical wideband waveforms, i.e. linear frequency modulation（LFM） waveform, pseudo random binary phase coding waveform, and Costas waveform. Simulation results demonstrate that the pseudo random binary phase coding waveform has the best anti-reverberation performance and joint resolution of velocity and range, and it is suitable to low speed target detection and identification in shallow water. This research may provide a reference for design of torpedo active acoustic homing waveform.