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Submarine cable secondary positioning method based on integrated positioning of acoustic long baseline and ultrashort baseline

An ultra-short baseline, submarine cable technology, applied in the re-radiation of sound waves, radio wave measurement systems, seismology for areas covered by water, etc., can solve problems such as low positioning efficiency, improve positioning construction efficiency, It is convenient for offshore positioning and construction to achieve random effects.

Inactive Publication Date: 2011-06-01
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

This positioning efficiency is low

Method used

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Embodiment Construction

[0020] The present invention provides a submarine cable secondary positioning method based on combined positioning of acoustic long baseline and ultra-short baseline, which facilitates offshore positioning construction and improves construction efficiency. The implementation steps are:

[0021] 1) Fix the transponder on the submarine cable to be tested and place it at a predetermined position, and install the underwater acoustic transducer on the measurement ship;

[0022] The underwater acoustic transducer described in step 1) is equipped with two transducers, and the two transducers form an ultra-short baseline array, one of which is a transceiver and displacement transducer, and the other is only for reception.

[0023] 2) The transducer sends out a call signal, and the transponder recognizes and sends out a response signal;

[0024] 3) Receive the response signal and process it;

[0025] The processing described in step 3) is to perform automatic gain amplification and fi...

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Abstract

The invention discloses a submarine cable secondary positioning method in geophysical exploration, which comprises the steps of: fixing a transponder on a submarine cable to be tested, installing an underwater acoustic transducer on a survey vessel, installing two transducers in the underwater acoustic transducer, wherein the two transducers form an ultrashort baseline array, wherein one transducer is used as a receiving and transmitting combined transducer and the other one is only used as a receiving transducer; sending a call signal by one transducer, recognizing the call signal and sending a response signal by the transponder, receiving the response signal and processing and figuring out geodetic coordinates of the transponder to obtain a left position and a right position of the transponder in the survey vessel, and determining an accurate position of the transponder and the final geodetic coordinates. The invention overcomes the problem on positioning a mirror image with the long baseline, improves the positioning accuracy and the positioning reliability, realizes the randomness of a positioning ship sailing at two sides of a survey line, is convenient for marine positioning construction, increases the construction efficiency by one time and has a positioning accuracy superior to 1m.

Description

technical field [0001] The invention belongs to the field of geophysical prospecting in water, and is an acoustic long baseline and ultra-short method for determining the position of the seismic signal receiver of the subsea cable (the known cable-laying navigation surface position determined by the first positioning) in offshore oil exploration. Submarine cable secondary positioning method based on baseline combined positioning. Background technique [0002] Submarine cable seismic exploration is a widely used exploration method in offshore resource exploration. It uses seismic signal receivers installed on the seabed to receive oil exploration data. Due to the influence of ocean currents, tides, ship speed and subsidence speed, it is difficult for submarine cables to be placed in the same position as the water surface, which directly affects the acquisition quality of seismic signals. At present, the acoustic wave positioning system is used to measure the underwater acous...

Claims

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Application Information

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IPC IPC(8): G01V1/38G01S15/06
Inventor 易昌华方守川何雪梅丁若愚任文静樊俊明王钗刘俊
Owner BC P INC CHINA NAT PETROLEUM CORP
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