GPS and Big Dipper double-mode timing method and system

Abstract

The invention relates to the technical field of satellite timing, and discloses a GPS and Big Dipper double-mode timing method and system. The method comprises the steps that firstly, satellite signals of a GPS and a Big Dipper are received; secondly, the received satellite signals are processed, and pulse per second signals are output; thirdly, the difference between the output pulse per second signals and pulse per second signals obtained through local clock frequency dividing is measured; fourthly, the difference of the output pulse per second signals and the pulse per second signals obtained through local clock frequency dividing is processed to obtain a frequency difference digital signal; fifthly, the frequency difference digital signal is converted into analog voltage to be output, and a local clock is controlled to be corrected according to the output voltage. According to the GPS and Big Dipper double-mode timing method and system, logic processing, software algorithm processing and frequency division processing are integrated in a control processing device (FPGA) to be achieved, the difficulty of the overall design of the system is lowered, the developing period is shortened, and the material cost is saved.

Description

technical field [0001] The invention relates to the technical field of satellite timing, and more specifically, relates to a GPS Beidou dual-mode timing method and system. Background technique [0002] High-precision, safe and reliable time synchronization is a basic requirement for the operation of contemporary power grids and even future smart grids. Most of the current synchronous devices use atomic clocks or high-precision constant temperature crystal oscillators in order to obtain accurate time, but the cost of this solution is too high and the size is large, which is not conducive to product design. If you use a general voltage-controlled temperature-compensated crystal oscillator or a voltage-controlled crystal oscillator, there is a huge limit on the accuracy of the crystal oscillator frequency. "Beidou Time" is based on the "Beidou Satellite Navigation and Positioning System" independently developed and established by my country, and realizes the time synchronizati...

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Problems solved by technology

This not only increases the cost of materials, but also increases the development cycle and complexity of the system

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