Multi-beam depth sounding sonar echo signal gain control system and method

Abstract

The invention discloses a multi-beam depth sounding sonar echo signal gain control system and a multi-beam depth sounding sonar echo signal gain control method. The gain control system includes upper computer software (101), a signal processing unit (102), a signal transmitting transducer array (103), a receiving transducer array (104), a pre amplifier (105), a variable gain controller (106), a band-pass filter (107) and an analog-to-digital converter (108). With the system and method of the invention adopted, the amplitude change of input signals can be tracked, and gain can be automatically adjusted, when the amplitude of the input signals becomes large, the gain of a receiver is decreased under control, when the amplitude of the input signals becomes smaller, the gain of the receiver is increased under control, and therefore, the output electric level of submarine echo signals is always maintained in a stable interval; and problems such as poor gain control effect and poor adjustment precision in a conventional multi-beam depth sounding system can be solved, and the accuracy of the measurement of complex seabed terrains by a multi-beam depth sounding sonar can be ensured.

Description

technical field [0001] The invention relates to the fields of underwater acoustic engineering and underwater acoustic detection, in particular to a multi-beam sounding sonar echo signal gain control system and method. Background technique [0002] Multi-beam bathymetric sonar can realize ultra-wide range and high-precision seabed depth measurement. It is a seabed topographic measurement equipment with high measurement efficiency, high measurement accuracy and high resolution. It can obtain a bathymetry profile of the seabed with a single launch. It has a wide range of applications in the field of marine surveying and mapping. [0003] Under the assumption of a flat seabed, it is generally believed that the seabed echo signal changes according to the law of exponential decay, and the method opposite to the change law of the echo signal is often used to stabilize the echo signal within a reasonable range through time-varying gain control. [0004] Affected by factors such as ...

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Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that the receiver cannot accurately receive the echo signal due to the changeable water body environment, complex bottom terrain, and different attenuation degrees of the echo signal after the multi-beam sounding sonar emits the acoustic wave signal

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