A Test Method for Satellite-Ground Time Synchronization in Satellite Semi-Physical Simulation Test

Abstract

The invention relates to a method for testing satellite-earth time synchronization in a satellite semi-physical simulation test. The method comprises the following steps: S1, establishing a satellite dynamics simulation model, and operating the satellite dynamics simulation model in a satellite dynamics simulation computer; S2, generating a synchronous second pulse signal, and separately sending the synchronous second pulse signal to an on-board computer and the satellite dynamics simulation computer; S3, receiving, by the satellite dynamics simulation model, a time signal sent by the on-board computer in real time, comparing the time signal with a time signal corresponding to the second pulse signal, taking the time signal sent by the on-board computer as an orbit calculation time after a judgment is correct, and obtaining a satellite attitude quaternion through calculation; and S4, adopting a star sensor electrical signal source to receive the satellite attitude quaternion sent by the satellite dynamics simulation computer, simulation in-orbit star sky, transmitting the simulated in-orbit star sky to a star sensor, and then forming closed-loop control with the on-board computer through the star sensor. A time delay in data transmission can be reduced, time synchronization between the on-board computer and the ground satellite dynamics simulation computer is guaranteed, and test precision of a satellite control system is improved.

Description

technical field [0001] The invention relates to a test method for satellite-ground time synchronization, in particular to a test method for satellite-ground time synchronization suitable for satellite semi-physical simulation tests. Background technique [0002] With the development of aerospace technology and the increasing complexity of space missions, the requirements for satellite accuracy and stability are getting higher and higher, so higher requirements are put forward for the accuracy and real-time performance of satellite ground simulation test technology. At present, there is no reliable and clear parameter index for reference for the real-time performance of the satellite ground simulation test system, and the understanding of real-time performance is relatively vague. Therefore, it is necessary to try to measure its key performance indicators and obtain meaningful data parameters. And in the process of testing, it is necessary to fully consider the factors that ...

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Problems solved by technology

At present, there is no reliable and clear parameter index for the real-time performance of the satellite ground simulation test system for reference, and the understanding of real-time performance is relatively vague

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