Synchronous self-contained hydrophone underwater acoustic signal acquisition system and working method

Abstract

The invention relates to a synchronous self-contained hydrophone underwater acoustic signal acquisition system and a working method. The system comprises an electromagnetic induction coupling module,a self-contained hydrophone, an electromagnetic induction synchronous cable and a seawater contact terminal, the electromagnetic induction coupling module comprises a wet end and a dry end, the wet end is located outside a watertight cabin of the self-contained hydrophone and comprises a magnetic ring capable of being opened and closed, and an induction coil is wound around the magnetic ring. Thedry end is located in the self-contained hydrophone and comprises a modulation and demodulation module, a clock module and a reference frequency generation module. The dry end and the wet end are connected through a watertight cable; the electromagnetic induction synchronous cable sequentially penetrates through the magnetic rings in the wet ends, and the two ends of the electromagnetic inductionsynchronous cable are connected with the seawater contact terminals to form a loop. The system utilizes the electromagnetic induction coupling synchronization module, the electromagnetic induction synchronization cable and the seawater contact terminal to realize synchronous acquisition between the self-contained hydrophones.

Description

technical field [0001] The invention belongs to the field of marine detection equipment, and relates to a synchronous self-contained hydrophone underwater acoustic signal acquisition system and a working method. Background technique [0002] When the underwater acoustic signals are received by hydrophones in different spatial positions and collected synchronously, the spatial gain can be obtained by using the array signal processing method, which will be beneficial to the detection, direction finding and positioning of underwater targets and other applications. In addition, the spatial correlation analysis and vertical directivity analysis of ocean noise also rely on the simultaneous acquisition of underwater acoustic signals at different spatial locations. [0003] In order to achieve synchronous underwater acoustic signal acquisition, the following two types of solutions are usually used at present: [0004] (1) Centralized acquisition system. There is a central acquisit...

AI Technical Summary

Problems solved by technology

Due to the silence of the buoy itself and the need for maritime safety, more hydrophones need to be deployed in the form of submersible buoys. At this time, there is no way to use the Beidou signal

In addition, the plastic-coated steel cable itself is heavy. If the length of the array is too long, it will cause great difficulties in actual deployment.

In addition, there is an optical synchronization method, which has a high synchronization accuracy. However, if the system is deployed in a place with turbid water near the sea, or the attitude deviation of a single acquisition node is too large to effectively receive optical signals, the synchronization accuracy of the system will be reduced.

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