Real-time clock error correction method used exploration instrument

Abstract

The invention provides a real-time clock error correction method used an exploration instrument. The method is a clock drift compensation method having a self-learning function. The method is used for compensating the influence of crystal oscillator frequency point drift on the system clock accuracy of the instrument. The method includes two functions of clock error learning and clock error correction. The clock error learning function provides the basis of clock frequency difference of the dynamic inspection work state. The clock error correction function monitors nodal ocean bottom seismograph clocks in work in real time so that the time accuracy of the nodal ocean bottom seismographs is ensured to be within a positive and negative sampling interval. The problem of difficulty of clock correction caused by great change of the common crystal oscillator frequency point along with external factors can be solved, and the method has the characteristics of being lightweight and easy to transplant.

Description

technical field [0001] The invention belongs to the field of geophysical measurement, in particular to the field of marine geophysical surveying instruments, and relates to a real-time clock clock error correction method for exploration instruments. Background technique [0002] Time service is an extremely important content in many geophysical observation methods. The measurement accuracy of time synchronization directly affects the quality of observation records, and is extremely valuable data required for data analysis and inversion. Especially in seismic exploration, the absolute time of seismic wave arrival and the accuracy of its measurement are important basis for seismic phase analysis and determination of source location. The quality of the time service firstly depends on the clock service in the geophysical instrument used. [0003] Among the existing technologies for providing a high-precision clock reference, there are two commonly used solutions. One is to use...

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Problems solved by technology

Thereby above-mentioned two kinds of technical schemes all can not be well integrated in the submarine seismograph, and what disclose in prior art data is only one kind or some kind of technical conception or theoretical assumption, do not really put into actual field application; And Foreign countries have blocked the use of this type of technology in our country, causing our country to invest a lot of scientific research funds and include it in the national major scientific research plan for scientific research.

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