Method of determining the position of a detector disposed at the bottom of the sea

摘要

A method of determining the position of a detector disposed under the sea, comprising the following steps: emit N waves from N emission points, record the propagation time of said wave between each emission point and the detector; determine the P time intervals Ti, with P≧1 such that, for each time interval Ti, there exist Mi emission points, Mi≧3 for 1≦i≦P, whose propagation times lie in the time interval, determine for each time interval Ti of the circle which passes closest to the Mi points whose propagation time lies in said time interval, and then determine the position of the detector as being the barycenter of the P centers of the circles determined previously.

主权项

1. A method for determining the position of a detector placed under the sea, comprising the steps of:
emitting N waves from N emission points at a surface of the sea, where N is an integer greater than 2, recording for each emission point a propagation time of said wave between said emission point and the detector, defining P time intervals Ti where P≧1 each time interval Ti being defined by setting a first time Ti,1 and, based on the recorded propagation times, determining a second time Ti,2 such that, there exist, among the N emission points, Mi emission points, Mi≧3 for 1≦i≦P, having propagation times in said time interval, for each of the P time intervals Ti, fitting the Mi points whose propagation time lies in said time interval Ti with a circle, thereby creating P circles and P centers of the P circles, and identifying a barycenter of the P centers of the P circles, identifying the position of the detector at the intersection of a vertical axis passing through said barycenter and the bottom of the sea, outputting the position of the detector in the generation of a seismic image.