基于iGMAS的星载原子钟性能评估

Evaluation of Spaceborne Atomic Clock Performance Based on iGMAS

全球连续监测评估系统(international GNSS Monitoring&Assessment System,iGMAS)是我国建设的对全球卫星导航系统(Global Navigation Satellite System,GNSS)运行状况和主要性能指标进行监测和评估的平台。在卫星导航系统中,星载原子钟性能的好坏直接影响导航系统的服务性能,因此对星载原子钟性能的评估很有必要。基于iGMAS提供精密钟差和快速钟差产品,对北斗(Bei Dou Navigation Satellite System,BDS)和GPS的星载原子钟的准确度、漂移率、稳定性3个指标进行评估。实验结果表明,相对于精密钟差数据,快速钟差数据引入准确性评估误差量级在10-4,引入的漂移率和稳定性评估误差大于10^(-1),因此在评估允许误差大于10^(-4)的情况下,快速钟差数据可作为原子钟准确性评估的数据来源。

The international GNSS Monitoring ＆ Assessment System （ iGMAS） is a platform for monitoring and evaluating theoperational status and key performance indexes of the Global Navigation Satellite System （ GNSS） in China. In the satellite navigation system,the performance of spaceborne atomic clock directly affects the service performance of the navigation system,so it is necessary to evaluate the performance of the spaceborne atomic clock. Based on iGMAS precise clock and fast clock error products, this paper evaluates the accuracy,drift rate and stability of spaceborne atomic clocks of BeiDou Navigation Satellite System （ BDS） and GPS. The experimental results show that,compared with the precise clock error data,the magnitude of the rapid clock error data evaluation error is10- 4,and the introduced drift rate and stability evaluation error is greater than 10- 1. So the fast clock error data can be used as data source for the accuracy of the atomic clock.