Detection Performance Simulation Analysis of Echolocation Dolphin Click Signal under Seabed Reverberation Background

To dig the essential reason why bottlenose dolphin click signal has excellent ability of detecting target, this paper analyzes bottlenose dolphin click signal and its detection performance according to theoretical derivation and simulation analysis from the aspect of time and frequency domain, wideband ambiguity function and reverberation suppression, respectively. The analysis results show that the spectrum of click signal contain two Gaussian functions and cross-term's function, and cross-term lead to the phenomena that low frequency component rising, high frequency component rising and new frequency component arising. The wideband ambiguity function of click signal is nail plate shape, as the sub-pulse's frequency overlap region decrease gradually, the energy of ambiguity function's main-lobe decrease, the velocity-distance resolution increase and the reverberation suppression performance for target sunk at sea bottom decrease gradually. These study results can provide reference for bio-inspired detecting signal designing in radar and sonar system.