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Method and device for estimating an inter-node distance between nodes arranged along towed acoustic linear antennas

An inter-node, node-to-node technology, applied in the direction of measuring devices, seismology, seismology, etc. for areas covered by water, which can solve problems such as errors in refraction phenomena

Inactive Publication Date: 2013-06-26
SERCEL INC
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Problems solved by technology

As detailed above, this refraction causes errors if the distance between nodes is estimated using the classical formula

Method used

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  • Method and device for estimating an inter-node distance between nodes arranged along towed acoustic linear antennas
  • Method and device for estimating an inter-node distance between nodes arranged along towed acoustic linear antennas
  • Method and device for estimating an inter-node distance between nodes arranged along towed acoustic linear antennas

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Embodiment Construction

[0087] According to the prior art, the above has Figure 1 to Figure 7 explained.

[0088] In the following description, considered as an example of estimating the inter-node distance between a sender node A and a receiver node B, as figure 1 , and belong to the network of nodes 14 arranged along the seismic streamers 20a to 20e.

[0089] Now refer to Figure 8 ， We present a first embodiment of the method according to the invention.

[0090] In step 81, the transmitter node A sends an acoustic signal to the receiver node B through an underwater acoustic channel.

[0091] In step 82, the receiver Node B receives the acoustic signal.

[0092] Step 83, consists of measuring the travel time t between sender node A and receiver node B AB .

[0093] In step 84, it is known that node A is at immersion depth z A The speed of sound C(z A ), using the following classical formula: D AB =C(z A )*t AB , to determine the approximate inter-node distance D between nodes A and B ...

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Abstract

It is proposed a method for estimating an inter-node distance between a sender node (A) and a receiver node (B) belonging to a network comprising a plurality of nodes arranged along towed acoustic linear antennas (20a-20e), an acoustic signal being transmitted from the sender node to the receiver node through an underwater acoustic channel. The method comprises a step of estimating the inter-node distance as a function of an estimate of a sound speed profile of the underwater acoustic channel, said sound speed profile depending on depth.

Description

technical field [0001] The field of the invention is the acquisition of geophysical data. The invention deals with the equipment needed for studying the seabed and its sediment properties. [0002] More specifically, the present invention pertains to a technique for estimating inter-node distances in a network of acoustic nodes arranged along a towed acoustic line antenna. [0003] The invention is particularly applicable to petroleum exploration engineering using seismic methods (offshore oil exploration), but the invention is also of interest to any other field requiring the implementation of geophysical data acquisition systems in marine environments. Background technique [0004] More particularly in the following, an attempt will be made to describe the problems existing in the field of seismic data acquisition for petroleum exploration engineering. Of course, the present invention is not limited to this specific application field, but it is concerned with any technol...

Claims

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Application Information

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IPC IPC(8): G01V1/28G01S11/14
CPCG01S11/14G01V1/3808G01V1/3861G01V1/38G01V1/3835G01S1/72
Inventor C·拉赫S·瓦勒兹
Owner SERCEL INC
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