Low-noise Hydroacoustic Signal Amplification and Acquisition Module

To address the issues of high interference and low signal-to-noise ratio in the simulated hydrophone output signals, a low-noise underwater acoustic signal amplification and acquisition module was developed. This module employs a piezoelectric hydrophone as the sensor, integrating signal conditioning, acquisition circuitry, and analog-to-digital conversion techniques to achieve efficient underwater acoustic signal collection. Currently, an array of multiple hydrophones is utilized for sound signal acquisition to enable more precise target localization. The design features four-channel synchronized acoustic signal acquisition. Experimental results demonstrate that the low-noise acoustic signal amplification and acquisition module can achieve stable signal sampling, with a gain of up to 20 times, a nonlinearity less than 0.0001, a signal-to-noise ratio of 81.51 dB, and a cutoff frequency of 50.265 kHz, effectively suppressing interference signals above 50 kHz. The maximum phase difference between two channels is 1.44°, indicating that the module meets the initial performance specifications.