GPSⅢ星载原子钟长期性能评估  

The Long-Term Performance Evaluation of GPSⅢSatellite Clocks

作　　者：王宇谱 马保印[1] 赵营营 许普润 李硕 李林阳 WANG Yupu;MA Baoyin;ZHAO Yingying;XU Purun;LI Shuo;LI Linyang(Beijing Satellite Navigation Center,Beijing 100094,China;Key Laboratory of Smart Earth,Yongfeng Road,Beijing 100094,China;School of Surveying and Mapping,Information Engineering University,Zhengzhou 450001,China;GNSS Research Center,Wuhan UniversityWuhan 430079,China)

机构地区：[1]北京卫星导航中心,北京市100094 [2]智慧地球重点实验室,北京市100094 [3]信息工程大学地理空间信息学院,郑州市450001 [4]武汉大学卫星导航定位技术研究中心,武汉市430079

出　　处：《大地测量与地球动力学》2024年第11期1148-1154,共7页Journal of Geodesy and Geodynamics

基　　金：国家自然科学基金(42104033);中国博士后科学基金(2022M712442);地理信息工程国家重点实验室开放基金(SKLGIE2023-Z-2-1)。

摘　　要：为评估GPSⅢ星载原子钟的长期性能,对其数据特性和时频特性进行分析。结果表明,GPSⅢ星载钟存在相对固定的频率漂移,均值为(4.7±0.1)×10^(-14)/d;拟合噪声整体保持长期稳定,均值为(2.0±0.007)×10^(-10)s,但存在约200d的波动周期;频率准确度在运行前期波动较大,但之后进入相对稳定状态,均值为(7.3±0.5)×10^(-12);千秒稳、万秒稳和天稳的均值分别为(2.5±0.02)×10^(-14)、(5.9±0.04)×10^(-15)和(4.2±0.04)×10^(-15);卫星钟差存在近似于卫星轨道周期1倍、2倍或1/2倍的显著周期项;GPSⅢ星载钟性能较GPSⅡF整体有改进和提升,但除准确度指标之外的整体性能稍逊于BDS-3和Galileo。In order to evaluate the long-term performance of GPSⅢsatellite clocks,we analyze the data characteristics and time-frequency characteristics of satellite clocks.The results show that GPSⅢsatellite clocks have a relatively fixed frequency drift rate,with a mean of(4.7±0.1)×10^(-14)/d.The fitting noise remains stable for a long time,with a mean of(2.0±0.007)×10^(-10)s,but there is a cycle fluctuation of about 200 days.The frequency accuracy has relatively large fluctuations at the early operation stage but then goes into a relatively stable state,with a mean of(7.3±0.5)×10^(-12).The mean value of frequency stability at average intervals of 1000 s,10000 s and 86400 s are(2.5±0.02)×10^(-14),(5.9±0.04)×10^(-15)and(4.2±0.04)×10^(-15),respectively.There are significant periodic terms in satellite clock offset that are approximately one-half,equal or double times the satellite orbital period.The overall performance of GPSⅢsatellite clock has improved and enhanced compared with that of GPSⅡF,but in addition to its accuracy index,the overall performance is not as good as that of BDS-3 and Galileo.

关 键 词：GPSⅢ星载原子钟 时频特性 数据特性 性能评估 

分 类 号：P228[天文地球—大地测量学与测量工程]