Underwater target identification method based on split beams

Abstract

The invention belongs to the technical field of ocean underwater target identification, and particularly relates to an underwater target identification method based on split beams, which comprises the following steps of: transmitting a sound wave signal with a specific frequency and a specific bandwidth to a certain sea area in a narrowband-broadband beam alternating period form, transmitting the sound wave signal to a marine organism target to be detected in the sea area, scattering echo signals are generated and are sequentially reflected to four channel receivers of the four-quadrant split beam transducer; the signal mixer performing narrowband signal beam splitting processing on the received narrowband-broadband alternately transmitted digital signals of the four channels to obtain the position of a to-be-measured target in a split beam; and meanwhile, the signal synthesizer performing broadband signal synthesis processing on the received digital signals of the four channels, extracting broadband signals in the digital signals of the four channels, synthesizing the four broadband signals to obtain single-beam broadband signals, and processing the single-beam broadband signals to obtain the size and biological species of the target to be measured.

Description

technical field [0001] The invention belongs to the technical field of marine underwater target identification and acoustic measurement, and in particular relates to an underwater target identification method based on split beams. Background technique [0002] In recent years, the destruction of oceans, rivers and other aquatic ecological environments has become more and more serious, and fishery resources, which are important indicators of ecosystems, have been seriously depleted. The monitoring of fisheries and biological resources in oceans, inland rivers, and lakes is an important key issue for aquatic organism protection and ecological restoration. One, especially the changes in the amount, density and activity status of marine organisms such as fish are the important basis for establishing the theory and method of resource monitoring and assessment. Quantitative monitoring and evaluation of biological resources can timely grasp the amount of fishery resources, understa...

AI Technical Summary

Problems solved by technology

However, with the need for monitoring, restoration and protection of the marine ecological environment, the existing methods have errors in the identification of underwater targets, and the timeliness of survey data is poor, so it cannot be effectively monitored and evaluated, and long-term, real-time fixed monitoring is not possible.

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