Time synchronization system and method of satellite signal simulator, and satellite signal simulator

Abstract

The invention is applicable to the field of satellite navigation, and provides a time synchronization system and method of a satellite signal simulator, and the satellite signal simulator. The methodcomprises the following steps: receiving a real satellite signal through a satellite signal receiver, generating pulse per second signals, and transmitting the pulse per second signals to an FPGA module of the satellite signal simulator; performing, by the FPGA module, rough counting on the pulse per second signals by using a clock signal to obtain a rough time interval difference between a clockgenerated by a local crystal oscillator and a satellite clock; constructing, by the FPGA module, a carry chain according to the rough time interval difference to perform carry chain refine counting, and calculating an accurate difference value between a clock rising edge and a pulse per second rising edge to obtain an accurate time interval between the local clock and the satellite clock; and correcting, by the FPGA module, the frequency of the local crystal oscillator in a crystal oscillator taming manner according to the accurate time interval, so that the local crystal oscillator generatesan optimized clock signal. By adopting the time synchronization system and method provided by the invention, synchronization with the real pulse per second signals is realized, and the correlation between the satellite signal simulator and a real satellite is enhanced.

Description

technical field [0001] The application belongs to the field of satellite navigation, and in particular relates to a time synchronization system and method of a satellite signal simulator and a satellite signal simulator. Background technique [0002] Time is one of the seven basic physical constants and one of the physical quantities that can be measured with ultra-high precision at present. Therefore, time synchronization technology is a key technology in the field of satellite navigation. More accurate time information means higher positioning accuracy. At the same time When designing a satellite signal simulator, the real-time synchronization between the satellite signal simulator and the real signal in the sky can make the designed satellite signal simulator more accurate. [0003] The prior art provides a GPS simulation system based on Beidou satellite positioning and timing, which is composed of a Beidou timing receiver, a clock taming module, a local voltage-controlle...

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Problems solved by technology

[0004] The purpose of this application is to provide a time synchronization system and method for a satellite signal simulator and a satellite signal simulator, aiming to solve the problem of low accuracy in adjusting the local clock by means of counting

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