Research on Low Radiation Noise Measurement System Based on a Bottom-Mounted Vector Hydrophone Array

The target radiation noise source level of underwater targets and their characteristic spectral frequency is gradually decreasing with advancing vibration and noise reduction technologies. To meet the low-frequency radiation noise requirements of quiet underwater vehicles, a bottom-mounted vector hydrophone array measurement system was designed via array measurements using a vector hydrophone combined with frequency-independent spatial directionality. The system achieved synchronized acquisition and real-time monitoring of underwater target radiation noise data. The performance of the measurement system was tested at Qiandao Lake, and its directionality and near-field focusing performance were analyzed. Test results show that the vector array exhibited better spatial gain than a pressure array under the same aperture conditions. When measuring real targets, the wideband sound source level of the target when sailing under certain working conditions was used to verify the operational performance of the system.