中文摘要：

海洋环境中弱信号的谱与海杂波的谱相混叠，目标和背景的位置差异很小，经典的频域或空域处理对海杂波中弱信号的检测难以奏效。鉴于小波变换在提取弱信号方面具有独到的优势，提出了一种海洋环境中基于小波变换的弱信号检测方法。利用雷达采集的真实海杂波数据，在不同信杂比的条件下，研究了该方法与经典频域法在信号检测中的差别。通过实验分析，与经典方法相比，当信杂比达到-14．7dB时，仍能很好地对信号进行检测。

英文摘要：

The spectrum of feeble signal folds the spectrum of sea clutter,and the location discrepancy between target and surrounding is small. So it is difficult for the classical processing in the frequency domain or space domain to detect the feeble signal in the ocean. A new method for the weak signal detection based on the wavelet transform in the ocean is presented. The differences between the new approach and the classical fre quency approach forsignal detection are studied using the real data of sea clutter collected by radar in the condition of the several signal-clutter-ratios. The results show that the new approach can detect the target effectively when the signal-clutter-ration is -14.7dB.