Abstract: To solve the poor covert of active sonar detection system, a bionic active sonar covert detection technology is proposed on the basis of dolphin whistle signals. At the transmitting terminal，the LFM signals are hidden in dolphin whistles to design an covert active sonar bionic detection signal. This signal is similar to dolphin whistles in the ocean，so we can use the biological environmental noise in the ocean to achieve active sonar covert detection. At the receiving terminal, the adaptive correlator is used as an active sonar processor. The adaptive correlator has a strong ability to match the marine environment. It can automatically match the marine channels, and reduce the multipath spreading loss effectively, thus getting higher signal-to-noise ratio processing gain than the matching filter. The adaptive correlator contributes to long-range detection. The simulation and the sea experiment proof the covertness and effectiveness of the proposed bionic active sonar covert detection technology based on dolphin whistle signals.

Key words: acoustics, bionic active sonar, covert detection, adaptive correlator, dolphin whistle signal