Multi-beam seafloor sub-bottom profile detection device

Abstract

The invention relates to a multi-beam seafloor sub-bottom profile detection device. The multi-beam seafloor sub-bottom profile detection device comprises a dry end and a wet end. The dry end is composed of a transmitting module and a signal processing and display module, and the wet end is composed of a parametric array and a vector hydrophone. According to the multi-beam seafloor sub-bottom profile detection device, LFM detection signals with frequency bands overlapped are designed on the basis of an FrFT technology, the parametric array with a small aperture serves as a phased transmitting transducer, the vector hydrophone serves as a receiving transducer, and the aperture of the array is reduced while the system bandwidth utilization rate is increased. Because multi-component signals with frequency bands overlapped can be transmitted, the number of transmitted beams is increased, the system bandwidth utilization rate is greatly increased, the detection efficiency is greatly improved, and the multi-beam seafloor sub-bottom profile detection device is more suitable for large-area sea sweeping detection. Because the aperture of the array is reduced, the device is more convenient to carry and has higher application and popularization value.

Description

technical field [0001] The invention relates to a multi-beam seabed shallow formation profile detection device. Background technique [0002] Compared with the traditional single-beam shallow seabed detection, using multi-beam equipment for seabed shallow formation detection can obtain more abundant bottom information while improving measurement efficiency. The multi-beam subsea shallow stratum profile detection equipment adopts the working mode of space scanning and navigation detection. Traditional multi-beam submarine shallow formation detection equipment usually uses LFM signal components with non-overlapping frequency bands in different directions, and then performs frequency domain filtering on the multi-component echo signals received at the same time, thereby eliminating the aliasing between echo signals in different directions. In order to distinguish the arrival direction of each component signal, the purpose of detecting multiple survey lines at the same time is ...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to propose a multi-beam submarine shallow stratum profile detection equipment for the problems of low system bandwidth utilization rate of traditional multi-beam submarine shallow stratum profile detection equipment, large matrix volume, and unfavorable popularization and application.

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