Patent ID: 6553316
Filing Date: 2003-04-22
Classification: G01V

Abstract:
A transmission method for transferring, by means of a communication network, a synchronization signal indicating a time break between a central control and seismic recording station and seismic signal acquisition and storage units distributed in a field, when a time of transit of the synchronization signal through at least part of the connection channels of the communication network between the central station and at least one dependent station may fluctuate within a determined fluctuation margin, comprising:a learning stage including formation of a specific frame and storage thereof by each station, and detection in each dependent station of signals delivered by a clock external to the device; pre-initiation of acquisition of seismic data by the seismic signal acquisition and storage units with a retention time interval in relation to a time of reception of the synchronization signal which is fixed and greater than a maximum transit time, considering a fluctuation margin; first dating of the time break from the external clock and transmission of the data obtained by the first dating in a form of a frame to the dependent; detection of the time of arrival, in each dependent station, of the frame, and a second dating of a time of arrival from the external clock; and measurement of an effective transit time equal to a time interval between the data associated with the first dating and data associated with the second dating, and consequently adjusting the time break to the seismic data stored in the seismic signal acquisition and storage units.