Research and implementation of bistatic sonar positioning system based on vector hydrophone

This paper presents the research and design of an active bistatic vector positioning system. The designed positioning system uses a low frequency active sound source. The vertical vector sensor array is used as the signal receiver, which consists of four elements. The vector hydrophone's natural combined directivity can be applied to suppress the strong direct path interference and the following reverberation, and it can effectively reduce the target detection blind area. Time-reversal correlation technique is adapted to detect target echoes, with the aim of suppressing noise and interference to improve the processing gain. Thereby, the target echo time-delay detection accuracy and orientation estimation accuracy can be improved. Simulation research results demonstrate the effectiveness of these proposed methods. The validity and reliability of the designed system are verified by lake trials.