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Underwater multi-cable acoustic network positioning method

A technology of acoustic network and positioning method, which is applied in the direction of seismology, seismology, and scientific instruments in areas covered by water, and can solve the problems of low positioning accuracy and poor anti-multi-path interference effect

Active Publication Date: 2017-02-22
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 disadvantages of the existing underwater multi-cable acoustic network positioning system, such as poor anti-multi-path 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. Anti-multi-path interference effect, improve the work efficiency of the tow cable system, shorten the time of positioning solution, and use the global solution algorithm to replace the commonly used step-by-step solution algorithm to reduce the positioning error

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[0054] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail,

[0055] 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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Abstract

The invention provides a underwater multi-cable acoustic network positioning method. A new multi-frequency real-time data acquisition mode and a global calculating method are provided. The method is characterized by firstly, according to a networking mode of a underwater multi-cable acoustic network positioning system, determining a polling scheme; secondly, using a multi-frequency real-time data acquisition model to acquire assigned time domain signals for receiving a water bird and emitting the water bird, if a direct signal and a multipath signal can be separated, extracting the direct signal, and if the direct signal and the multipath signal are overlapped, using another anti-multipath scheme to remove the multipath signal; and finally using a global calculating algorithm to position each water bird position. A multi-frequency real-time data acquisition technology has advantages that all the water bird emitting and water bird receiving can be simultaneously performed so that towing cable system efficiency is greatly increased, positioning calculating time is shortened and an anti-multipath interference effect of the acoustic network positioning system is increased; and a positioning error is reduced through using the global calculating algorithm.

Description

technical field [0001] The invention relates to an underwater multi-cable acoustic network positioning method, which belongs to the field of multi-cable acoustic network positioning in a marine seismic towing cable system. 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, characteristics and key technologies of underwater mu...

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Application Information

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IPC IPC(8): G01V1/38
CPCG01V1/3835
Inventor 颜晗华波宋明玉陈国才李遥高菲韦佳利
Owner CSSC SYST ENG RES INST
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