摘要
星载原子钟是卫星导航系统的星上时间基准,其性能的优劣直接决定了导航定位服务的质量。我国BDS目前处于全面建设阶段,对BDS卫星钟产品进行质量分析以及在轨星载原子钟的性能评估是一项重要的工作。目前,多个GNSS分析中心同时提供BDS卫星钟差产品,但对于不同分析中心的钟差产品特性对比和分析却鲜有报道。因此,本文从连续性指标、一致性指标、拟合精度指标、预报特性指标,对CODE、GFZ和WHU分析中心的北斗卫星钟差不同采样间隔数据进行了对比和分析。同时,基于北斗卫星钟产品对北斗系统星载原子钟短期频率稳定性进行了评估,得出了一些有益的结论。
The space-borne atomic clock acts as the time reference on the satellite for satellite navigation systems, whose performance directly determines the quality of navigation and positioning service. Currently, the BeiDou sat- ellite navigation system（BDS） is in the comprehensive construction stage, and it is crucial to analyze the satellite clock products and evaluate the performance of on-orbit satellite atomic clocks. Several GNSS analysis centers, such as CODE, GFZ and WHU, provide BDS clock products. Unfortunately, there are few public literatures to study or analyze the characteristic difference between these clock products. The performances of different sampling interval clock data from different GNSS analysis centers are analyzed and made comparison on the continuity, consistency, fitting accuracy and prediction characteristic. At the same time, the short-term frequency stability of BeiDou satellite clock is evaluated based on BeiDou satellite clock products, and some useful conclusions are drawn.
出处
《测绘科学技术学报》
CSCD
北大核心
2017年第3期251-257,共7页
Journal of Geomatics Science and Technology
基金
国家重点研发计划项目(2016YFB0501701)
关键词
北斗卫星钟
多系统实施计划
数据质量
性能分析
频率稳定性
BeiDou satellite clock
Multi-GNSS Experiment（MGEX）
data quality
performance analysis
fre- quency stability
