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卫星的正常运行和应用依赖于星上时间与地面时钟的精确同步,而星地时间的精确同步是通过地面测控系统对星上时间进行校正来实现的。由于多种因素的影响,卫星在运行中星上时钟会产生漂移,从而导致星上时间不准确,这不符合卫星正常运行和有效载荷正常应用的要求。对星上时间准确校正涉及多个环节,在整星地面测试过程中需要认真仔细分析和验证。同样,整星性能和指标的地面测试也需要在星地时差满足设计指标的状态下进行。针对卫星星上时间产生原理,提出了一种高精度星地时延计算模型和星上时间校正方法。
The normal operation and application of satellites depend on the exact synchronization of the on-board time with the terrestrial clock, and the accurate synchronization of the terrestrial time is achieved by correcting the on-board time by the ground-based monitoring and control system. Due to a variety of factors, satellite in operation, the clock will drift on the star, resulting in inaccurate time on the satellite, which does not meet the normal operation of the satellite and payload requirements of the normal application. Accurate correction of time on the satellite involves many aspects of the entire satellite ground testing process needs careful careful analysis and verification. Likewise, ground tests of the overall star performance and metrics also need to be done with the star-delta time lag to meet design specifications. Aiming at the principle of generating satellite time, a new model of high-precision satellite time delay and a method of satellite time correction are proposed.