Design And Implementation Of The Multi-channel Receivering For Low-frequency Detection System

Ocean Marine noise is the important data for the research of marine resources. In order to realize environmental monitoring related to shallow sea waters,it is quite necessary to collect and analyze seabed noise. Based on multi-chanel low-frequency detecting acquisition system,this paper has designed the system's receiver,which has completed the signal conditioning of 48 routes of submarine sound signals and will provide effective acoustic data for the back-end data collection. Meanwhile, in order to measure relevant parameters of the system's hydrophone, the author has designed and realized the pre-amplifier of hydrophone whose gain bandwidth can be adjusted,so as to apply the pre-amplifier in the measurement of hydrophone's parameters under different operating frequencies.Multi-channel low-frequency detecting acquisition system has to conduct signal conditioning of 48 channels of submarine sound signals. This paper has designed the signal conditioning circuit of the receiver. During the designing process, it has emphasized on illustrating problems of 48 routes including low power consumption, low noise and consistent design, and also made detailed description of circuit board's digital & analog circuit design and printed circuit board(PCB) layout design.The pre-amplifier of hydrophone has conducted signal conditioning of the signal received by the hydrophone. This paper has designed the circuit and mechanical structure of the pre-amplifier which can realize manually adjust the bandwidth and gain. The per-amplifier is characteristic of small volume, being convenient to carry around and easy installation. It has developed the low noise design from the aspects of circuit form, layout pattern and mechanical structure.