高阶谱双通道的水声信号检测方法研究

Detection of underwater acoustic signals with dual-channel high-order spectrum

实际海洋环境中,水下声纳系统往往因环境条件的失配而性能下降。从高阶统计量分析的角度来研究失配条件下的水声信号检测问题。采用二阶、三阶统计联合分析的方法,把双谱能量检测器与常规能量检测器联合构成一种双谱双通道检测器。它同时利用了水声信号中的二阶和三阶统计信息,增加了所利用的信息量,且能在更大程度上适应复杂水声环境变化的要求,改善和提高了水声信号的检测性能。计算机仿真证明了上述算法的有效性。该方法为失配条件下的水下微弱信号检测提供了一条可能的途径。

Performance of sonar systems at sea always declines due to mismatch between the sonar system and the sea status. Detection of underwater acoustic signals under mismatched comditions is studied using high-order joint statistics. A dual-channel detector performing bi-spectrum detection and energy detection is constructed using second and third order statistics. This method makers use of high-order ststistic information in the time domain. It improves the ROC performance of the detector. The detector is applicable to underwater acoustic environments. Simulation shows its effectiveness.