Method for obtaining straight arrival time of transmitting waterfowl acoustical signal in marine geophysical prospecting
An acoustic signal and water bird technology, applied in the field of multi-cable acoustic network positioning, can solve the problems of low positioning accuracy, poor anti-multi-path interference effect, shortening the time for positioning and solving, etc. The effect of positioning solve time
Active Publication Date: 2017-04-19
CSSC SYST ENG RES INST
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Problems solved by technology
[0005] The technical problem solved by the present invention is: to overcome the shortcomings of the existing underwater multi-cable acoustic network positioning system, which have poor anti-multi-channel interference effect and low positioning accuracy, and adopt a new multi-frequency real-time data acquisition method to improve the accuracy of the acoustic network positioning system. Excellent anti-multi-path interference effect, improve the working efficiency of the towing cable system, and shorten the time for positioning and solving
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[0039] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail,
[0040] The offshore towline system is generally composed of 3 to 4 towlines, and the towlines are arranged in parallel. The multi-cable acoustic network positioning system is mainly composed of transmitting waterfowl and receiving waterfowl. The composition of each towed cable is the same. There are two main networking methods. Place transmitting waterfowl (namely, acoustic bird) at the front and end of the streamer, and place receiving waterfowl (namely, horizontal bird) in the middle, as shown in Figure 1(a); The signal attenuation is relatively large, and the transmitting waterfowls are only deployed at the front and end, which will cause the receiving waterfowls in the middle to fail to receive the signal. Generally, the principle of transmitting and receiving waterfowls is arranged at intervals, as shown in Figure 1(b), the transmitting wat...
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The invention proposes a method for obtaining the straight arrival time of a transmitting waterfowl acoustical signal in marine geophysical prospecting, and the method comprises the steps: firstly determining a polling scheme according to a networking mode of an underwater multi-cable acoustical network positioning system; secondly obtaining time domain signals of a specified receiving waterfowl and a specified transmitting waterfowl through employing a multi-frequency real-time data obtaining model, extracting a straight arrival signal if the straight arrival signal can be separated from a multi-path signal, and employing a multi-path resistance scheme to reduce the multi-path signal if the straight arrival signal is overlapped with the multi-path signal. According to the invention, the method is advantageous in that the transmitting waterfowl and the receiving waterfowl can operate at the same time; the method greatly improves the efficiency of a cable pulling system, shortens the positioning solving time, and improves the multi-path interference resistance effect of the acoustical network positioning system.
Description
technical field [0001] The invention relates to a method applied in marine geophysical prospecting to obtain the direct arrival time of waterbird sound signals, and belongs to the field of multi-cable acoustic network positioning in marine seismic towing cable systems. Background technique [0002] Underwater multi-cable positioning technology is a key technology in marine seismic exploration technology. Accurate streamer positioning can ensure high accuracy of 3D seismic imaging and provide a reliable basis for the formulation of subsequent development plans. However, in the acquisition of marine seismic data, the length of the towed cable reaches several thousand meters, and its position changes from time to time due to the influence of ocean currents, and the depth of the towed cable is relatively shallow, so the influence of the reflected sound from the sea surface is obvious during the sound propagation process. [0003] The prior art has analyzed the principle, charac...
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IPC IPC(8): G01S15/36
CPCG01S15/36
Inventor 颜晗华波陈国才李遥高菲韦佳利宋明玉
Owner CSSC SYST ENG RES INST