利用目标信号功率主要集中在低频部分的特点 ,对信号进行小波分解 ,提取在不同频率带内信号的能量作为特征 ,用费歇判别方法对目标进行检测 .通过不同浪级情况下海洋水压力场的仿真信号数据 ,对某型目标舰船的水压力信号进行了检测计算 ,验证了该方法的有效性 ,尤其是在高海况、低信噪比条件下 ,达到了比较好的效果 . By using the characteristic that the target signal power is mainly concentrated in the low-frequency part, the signal is decomposed by wavelet and the energy of the signal in different frequency bands is extracted as the feature, and the Fisher’s criterion is used to detect the target.According to the ocean water pressure field , The water pressure signal of a certain type of target ship is tested and calculated, which proves the effectiveness of the method. Especially under high sea conditions and low signal-to-noise ratio, good results are achieved.