METHOD AND DEVICE TO CORRECT SYNCHRONISATION FUNCTION IN NODE ASSEMBLY FOR SEISMIC DATA ACQUISITION Russian patent published in 2014 - IPC G01V1/00 

FIELD: instrumentation.

SUBSTANCE: group of inventions refers to method and device for control and correction of time settings used in a distributed nodal seismic receiving system. So a wireless seismic data recording unit is fitted by a wireless receiver providing access to the common external time standard shared by the variety of seismic data recording units in a seismic system. The receiver is made able of replicating the local version of the external time reference point with which an analog-to-digital converter of a seismic sensor is synchronised. The receiver is made able of replicating the local version of the common external time standard to put time marks on local events of the node. The receiver can be switched into nonoperating mode with low power consumption for the time periods when the seismic data recording unit continues to record the seismic data, thus battery supplied power is preserved. The system implements the method for local clock correction basing on the intermittent access to the common external time standard. The method provides for the correction of local time at the clock with the help of a voltage controlled clock generator to consider the time errors caused by the environment conditions. Additionally the invention provides for more reliable method to correct drift of the local clock.

EFFECT: minimisation of power consumption, improved accuracy of data acquisition.

33 cl, 7 dwg