Pulse signal precise timing device based on GPS module

Abstract

The invention relates to a pulse signal precise timing device based on a GPS module. The pulse signal precise timing device comprises a single chip microcomputer control module, the GPS module, an interface module and a power source module. The power source module converts a 220 V AC electric supply into a direct current needed by the single chip microcomputer control module. The GPS module receives GPS satellite positioning information, and outputs surveying vessel position data and 1PPS time reference signals. The interface module receives the positioning information supplied by the GPS module, the information which is originally the RS 232 level is converted into the TTL level and then transmitted to the single chip microcomputer control module, the 1PPS time reference signals of the GPS module and excitation pulse signals sent by a gun array controller are received and isolated in an optoelectronic mode to be transmitted to the single chip microcomputer control module, and a gun array excitation pulse timing result output by the single chip microcomputer control module is stored into an internal storage card and output from a standard serial port. According to the pulse signal precise timing device based on the GPS module, the timing precision is smaller than 0.01 ms, and the requirement of the ocean depth seismic exploration operation for precisely timing the gun array excitation time can be completely met.

Description

technical field [0001] The invention relates to a pulse signal precise timing device for a seismic exploration system, belonging to the technical field of geophysical exploration. Background technique [0002] In deep seismic exploration operations, the seismic exploration system is divided into two units: source and acquisition. The marine seismic exploration system generally uses the gun array as the source unit, and the seabed seismograph as the acquisition unit. The same time standard must be used for gun array excitation and sea bottom seismograph data reception, and this time standard is GPS time. The seabed seismograph integrates a built-in miniature GPS receiving module to record GPS time. In the past exploration system, the time when the gun array was excited was recorded by the navigation and positioning computer, but the positioning computer generally uses the Windows operating system, and its timing accuracy can only reach 100. on the order of milliseconds. Th...

AI Technical Summary

Problems solved by technology

The data sampling rate of the submarine seismograph is generally around 200Hz, which means that the seismic data recorded by the submarine seismograph has a sampling point every 5ms or so, and the timing accuracy of the gun array excitation time of 100 milliseconds cannot meet the requirements

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