Underwater sound array system without cable connection in deepwater and synchronous acquisition method

Abstract

The invention relates to an underwater sound array system without cable connection in deepwater and a synchronous acquisition method. The synchronous acquisition method is used for long-term synchronous data acquisition for array elements of underwater sound array in the deepwater. The method comprises a synchronization method and a data acquisition recording method. The synchronization method comprises the steps of: 101) timing the array elements; and 102) keeping the time continuously by high-precision clock sources contained inside the array elements, thereby realizing long-term accurate synchronization among the array elements. The step 101) can adopt PPS signals provided by a GPS system or a Beidou system to accomplish timing. The clock source can adopt a miniature CPT atomic clock. According to the invention, a strategy for carrying out synchronization by adopting synchronization signal wires in a cable in the prior art is omitted among the array elements, and a mode of cooperating timing with time keeping is adopted to realize synchronization of the array elements. In addition, introduction of the synchronization mode enables the array elements to be arranged flexibly and can integrate functions of data acquisition and recording.

Description

technical field [0001] The present invention relates to the field of marine surveying instruments, in particular to a cable-free, synchronously collected underwater acoustic array system applied to marine acoustic research, that is, the present invention specifically relates to a deep-water cable-free underwater acoustic array system and a synchronously collected method. Background technique [0002] Synchronous acquisition of ocean acoustic signals with large-scale range and different depth distribution is an important content of ocean acoustics research, and with the continuous development of ocean acoustics research, research work has gradually moved from shallow sea to deep sea, so the development of underwater acoustic signals suitable for deep water The demand for signal acquisition array system is very urgent. [0003] At present, the traditional underwater acoustic signal acquisition array system is mainly composed of two parts: the hydrophone array and the acquisiti...

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Problems solved by technology

[0004] 1. The implementation of synchronous acquisition is complicated: in order to realize the synchronous acquisition of the full array system, the traditional working method needs to set a synchronous signal in the hydrophone array to realize synchronous acquisition between different hydrophones, so that no matter in the hydrophone array or Synchronization signal lines must be set at the system acquisition and recording terminals, which greatly increases the complexity of the system

[0005] 2. High risk: The hydrophone array used in deep water contains multi-core power supply transmission lines and signal transmission lines. In the deep water and high hydrostatic pressure environment, the length is large and the probability of damage is high. Once damaged, the entire array will be completely damaged and maintenance is difficult. Very big

[0006] 3. Inconvenient operation: deep-water arrays are large in size and heavy in weight, difficult to deploy and recover at sea, inconvenient to store and transport, and the intervals of the array elements are fixed and cannot be changed, making it difficult to achieve optimal spatial distribution of sound field receiving intervals

[0007] 4. Low signal quality: The long-distance power supply cable will inevitably lead to the introduction of space radiation interference, and the increase of crosstalk between channels will reduce the dynamic range of the hydrophone array, and the long-distance signal transmission cable will make the underwater acoustic signal The attenuation increases, and the distributed capacitance of the long cable increases, which will also lead to the degradation of the underwater acoustic signal quality

At present, the existing self-contained underwater acoustic signal recording equipment at home and abroad (that is, the equipment that uses its own battery to work underwater and independently completes signal acquisition and recording) is still a single-function single-point device, which cannot realize multiple The array elements are collected synchronously, so the detection task of the coordinated data acquisition of each array element at different depths in deep water cannot be completed (that is, because the synchronization of the underwater acquisition and recording units in the prior art adopts the synchronous data line laid inside the cable Complete, so when multiple array elements are used to work together in a deep-water environment, too long cables and complicated processes will make the deep-water acquisition task extremely complicated)

In addition, according to the applicant's research on domestic and foreign patents, in the field of marine surveying instruments, there is no underwater acoustic array system that integrates the terminal acquisition system and the hydrophone array to achieve synchronous recording and acquisition.

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