Towed deep sea seabed shallow structure acoustic detection system and method

Abstract

The invention discloses a towed deep sea seabed shallow structure acoustic detection system and method, and belongs to the field of seabed exploration. The system comprises a mother ship console and atowed body, the mother ship console is connected with the towed body through a photoelectric composite cable, the length of the photoelectric composite cable is adjustable, a transducer sound sourceand hydrophones used for recording reflection / scattering echoes are placed at the position close to the seabed in a near-bottom dragging mode, and the hydrophones are evenly distributed on the periphery of the bottom of the towed body and used for collecting echo signals. The transducer sound source adopts a sound source system combining high frequency and low frequency; a sound source of the low-frequency transducer is placed above the high-frequency transducer, the sound sources of different frequencies are combined to ensure that broadband signals are obtained, the dual purposes of high resolution and high penetration depth are achieved, and the invention can be further applied to seabed sediment recognition and synchronous detection of cracks of a deeper layer of sediment.

Description

technical field [0001] The invention belongs to the field of marine exploration, and in particular relates to a towed acoustic detection system and method for deep seabed shallow structures. Background technique [0002] Shipborne multi-beam sounding, shallow stratum profiler and side-scan sonar are the main tools for detecting seabed shallow surface information at present. The working principles of these methods are relatively similar. They all transmit sound source signals through transducer probes, and then process and record The reflected or scattered echoes are used to identify the substrate. The main difference between these methods is that the frequency and intensity of the sound waves emitted by the transducers are different. Generally, high frequency is used to detect shallow water depth or side scan image information, low frequency is used to detect deep sea depth or shallow profile information, and high frequency can improve resolution. The low frequency can incr...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the existing acoustic detection system that it is difficult to excite sound source signals containing both low-frequency and high-frequency energy, and cannot realize high-precision detection of seabed surface information, and to provide a towed deep seabed shallow structure acoustic The detection system and method can simultaneously excite low-frequency and high-frequency sound source signals, achieve the dual goals of high resolution and high penetration depth, and also have the function of collecting echo signals, and collect reflection information containing low-frequency and high-frequency energy, which can improve The signal-to-noise ratio and resolution of the echo signal further improve the detection accuracy of seabed surface information

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