Underwater transient signal detection based on Orthogonal Empirical Mode Decomposition

Once widely used for UWB radar with the advantages of high resolution on range and direction, transient carrier-free signal with short pulse and Gaussian waveform fit for underwater transmission is imported for Sonar system. Because of relative wide band and capability of all-range detection, the spectrum of such short pulse spreads transiently over low frequency domain. The signal for detection in this paper is cylinder target echo in anechoic pool. The target echo is denoised via Orthogonal Empirical Mode Decomposition (OEMD) and threshold. The detection presents peak time fast and precisely after target echo recomposition. The special characteristics for underwater body target detection represent more radiation points without distance extension.