基于时间尺度域二维相关的宽带信号检测

Wide-band signal detection based on time-scale domain 2-D correlation

按相关检测的思想,提出了基于小波变换(CWT)时间尺度域二维相关的宽带水声信号检测方法,并对其检测性能进行了仿真与实验分析,结果表明:基于CWT的检测器检测性能优于能量检测器,与匹配滤波器相比差别不是很大,而且基于CWT的检测器有很好的鲁棒性,特别是在低信噪比下的检测性能尤其突出。该方法不仅仅适合于宽带水声处理,也适合于处理波形和达到时间未知的暂态声呐、雷达及鱼雷自导等信号。

Following the idea of correlation detection, a wide-band signal detection method based on the 2-D correlationof time-scale domain of wavelet transform is presented in this paper. The performance of this wide-band signal detectoris analyzed by simulation and experiment. It shows that CWT based detector has good performance far more thanthat of energy detector, and less decrease than that of matched filter, especia1ly at low signal to noise ratio state. Thismethod is not only suitable for wide-band acoustic signal processing, but also fit for the processing of other transientsignals whose waveform and arriving time is unknown.