基于目标过零特性与能量特性的声引信检测方法

利用目标出现引起的噪声波形单位时间过零点数均值与宽带能量的变化，提出了一种信号联合检测方法，用于被动声引信的微弱信号检测，以提高信号的检测性能。实验结果表明，提出方法较单纯的过零检测方法使信号增强5～8 dB，而较宽带能量检测方法能抑制噪声4—7 dB，算法运算量较小，在水中声引信系统具有良好的应用前景。

A Joint Method of Zero-crossing Detection and Energy Detection

A joint method of signal detection for detecting the weak signal of passive acoustic fuze was presented by the variations of the mean values of zero crossings over a unit time interval and the broad?band energy amplitude based on noise waveform caused with target appearance, to improve the signal detecting performance. The experimental results taken from the sea show that the proposed method can enhance the target signal by 5 — 8 dB compared with zero crossing detection one, suppress the addi?tive Gaussian white noise by 4 - 7 dB compared with the energy detection one, and has good prospects for applying it to an underwater acoustic fuze system.