Fishing sonar and sonar echo signal processing method

Abstract

The invention discloses fish finding sonar and a sonar echo signal processing method. According to the fish finding sonar, on the basis of the analysis of the traditional fish finder principle, the compressed sensing theory is applied to echo signal processing in the processes of signal collecting and processing. The method concretely includes the steps that by the adoption of the mode that echo signals are projected on a low-dimension measurement matrix, measurement data fewer than the measurement data needed by the Nyquist sampling theorem are obtained, a reconstruction matrix is built in combination with sparse forms, in a fractional order Fourier transform domain, of the echo signals, and finally target echo signal parameters are obtained through optimization solution by using a compressed sensing signal reconstruction method. On one hand, the method can reduce the sampling rate of the signals and meanwhile effectively relieve the pressure for data storage, calculation and transmission of hardware; on the other hand, sparse representation is performed on the echo signals, the most intrinsic characteristic of the echo signals can be extracted, the effect of noise removing can be achieved, and accuracy of a device is improved.

Description

technical field [0001] The invention relates to a fishing detection sonar and an echo processing method, in particular to a fishing detection sonar for sonar echo processing based on compressed sensing, and belongs to the technical field of underwater acoustic engineering. Background technique [0002] With the development of the national economy, people's demand for marine resources is increasing day by day, and the development of fishery resources has been paid more and more attention. In order to effectively improve the fishing of marine fishery resources, we need to continuously improve and develop fishing devices to improve fishing efficiency. [0003] Chinese Patent Literature CN [0004] 1959434A discloses a multi-beam ultrasonic fish finder, the fish finder uses a multi-channel underwater acoustic transducer array to improve the strength of the received echo, solves the problem of correct judgment of the width and thickness of the fish school, and the multi-beam fun...

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Problems solved by technology

[0004] 1959434A discloses a multi-beam ultrasonic fish finder, the fish finder uses a multi-channel underwater acoustic transducer array to improve the strength of the received echo, solves the problem of correct judgment of the width and thickness of the fish school, and the multi-beam function The use can greatly improve the acquisition function of seabed information, but there are still some problems in the processing of fishing echo signals in the prior art: 1. The multi-beam fish finder adopts the The traditional Nyquist sampling method requires high sampling frequency and computing resources, and has high requirements for hardware storage and computing processing capabilities.

2. The detected target echo signal is mixed with a lot of interference and noise signals, such as reverberation and system noise, which is not conducive to the detection of fish school information through the reflected echo signal, which will lead to many wrong detection information and reduce the detection efficiency

The multi-beam fishing device filters the echo signal to eliminate noise interference, but when the noise is close to the signal frequency, filtering alone cannot remove the noise very well, so the accuracy of the fishing device is affected

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