Satellite internal equipment timing method and system

Abstract

The invention provides a satellite internal equipment timing method and a satellite internal equipment timing system. The method comprises the steps that 1, a satellite host synchronizes a first frame pulse signal of a bus with a UTC (Coordinated Universal Time) sharp second moment, and timing information is triggered and sent by the UTC sharp second moment, wherein the timing information comprises signal waveform of the bus; 2, each slave equipment receives the timing information by the bus, time of detecting the first frame pulse signal of the timing information is locked, and timing is carried out by taking the time as a criterion; 3, when the salve equipment completes receiving the timing information, a second value of the timing information is written into a second time register, a timing value is written into a millisecond register, and timing from the satellite host to the salve equipment is completed. According to the method, the self waveform pulse of the bus is taken as a time PPS (Pulse Per Second) signal, the timing of the PPS signal is completed by a sending edge of the bus, the PPS signal is reduced, a connecting cable is reduced, the connection relation is simplified, the cost is reduced, precise timing is provided, and the reliability is increased.

Description

technical field [0001] The invention relates to the field of time management in satellites in aerospace and aviation, in particular to a method and system for adjusting the time of satellite internal equipment. Background technique [0002] Inside the satellite, because the status, data parameters, and information flow of each device are related to time, there is usually a time standard inside the satellite, which is mainly in the satellite's star host or data manager. Generally speaking, the satellite sends the time code to each device by broadcasting through the bus, and each device corrects the time of the device after receiving the time code. Due to processing and transmission delays, the accuracy of this calibration can reach the order of tens of milliseconds, which cannot meet the requirements of high-precision time equipment. Therefore, the star host or data manager of the satellite also needs to provide a separate PPS (Pulse Per Second, pulse per second) signal for ...

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a method and system for adjusting the time of satellite internal equipment to solve the problem of too many signals required for high-precision time synchronization of various equipment in the satellite system in the prior art, and to make full use of the bus to reduce the number of connecting cables in the system and simplify the connection relationship

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