Method and device for calibrating local clock based on satellite time service

Abstract

The embodiment of the invention provides a method and a device for calibrating a local clock based on satellite time service. The method mainly comprises the following steps of: performing frequency multiplication on a local clock signal by using a digital phase-locked loop to acquire a frequency multiplication clock; performing frequency counting on a satellite clock signal received by a satellite receiver by using the frequency multiplication clock to acquire a count value corresponding to the satellite clock signal, and subtracting the count value from a count value corresponding to a local standard clock to acquire a count difference value; and acquiring clock offset between the local clock signal and the satellite clock signal according to the count difference value, and calibrating the local clock according to the clock offset. By the method and the device provided by the embodiment of the invention, the satellite clock signal is subjected to frequency counting through the frequency multiplication clock, so that the offset between the local clock signal and a clock signal output by a global positioning system (GPS) / Beidou satellite navigation system can be quickly acquired, and input parameters can be provided for a local clock control algorithm.

Description

Technical field [0001] The present invention relates to the field of wireless communication, and in particular to a method and device for calibrating a local clock based on satellite timing. Background technique [0002] For a modern country entering the information society, navigation and positioning and timing systems are the most important and one of the most critical national infrastructures. Precise time is the basic physical parameter in scientific research, scientific experiment and engineering technology. It can provide the necessary time base coordinates for the measurement and quantitative research of all dynamic systems and time series processes. Precision timing has a wide range of important applications in the fields of communications, power, control and other industrial and national defense fields. [0003] GPS (Global Positioning System, Global Positioning System) is a new generation of space satellite navigation and positioning system. Its main purpose is to provid...

AI Technical Summary

Problems solved by technology

[0006] In the prior art, there is no effective method for realizing satellite accurate time automatic calibration technology

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