赵丹宁, 雷雨. GLONASS星载原子钟的长期特性分析[J]. 武汉大学学报 ( 信息科学版), 2021, 46(6): 895-904. DOI: 10.13203/j.whugis20190233
引用本文: 赵丹宁, 雷雨. GLONASS星载原子钟的长期特性分析[J]. 武汉大学学报 ( 信息科学版), 2021, 46(6): 895-904. DOI: 10.13203/j.whugis20190233
ZHAO Danning, LEI Yu. Long-Term Characteristics Analysis of GLONASS In-Flight Clocks[J]. Geomatics and Information Science of Wuhan University, 2021, 46(6): 895-904. DOI: 10.13203/j.whugis20190233
Citation: ZHAO Danning, LEI Yu. Long-Term Characteristics Analysis of GLONASS In-Flight Clocks[J]. Geomatics and Information Science of Wuhan University, 2021, 46(6): 895-904. DOI: 10.13203/j.whugis20190233

GLONASS星载原子钟的长期特性分析

Long-Term Characteristics Analysis of GLONASS In-Flight Clocks

  • 摘要: 俄罗斯全球卫星导航系统(global navigation satellite system,GLONASS)于2011-10恢复提供全球服务,分析其星载原子钟特性对系统性能评估、完好性监测、卫星钟差确定和预报等具有重要意义。首先基于俄罗斯联邦航天局GLONASS定位、导航、授时信息与分析中心(Information and Analysis Center for Positioning, Navigation and Timing,IAC)提供的2016-01-01—2019-05-11多星定轨解算的GLONASS精密卫星钟差产品,利用包含原子钟相位、频率与频漂参数的二次多项式拟合卫星钟差模型,分析了GLONASS在轨铯钟相位、频率、频漂与星钟模型噪声的长期变化特性;然后采用重叠哈达玛方差计算了铯钟的频率稳定度。结果表明,GLONASS在轨铯钟的相位和频率变化相对平稳;在轨铯钟模型的噪声水平和频漂均值分别为0.7 ns和5.94×10-15/d;GLONASS在轨铯钟千秒频率稳定度保持在10-13量级,频率稳定度随着星钟模型噪声增大而降低;新的卫星钟具有更优良的物理特性和更低的模型噪声。

     

    Abstract:
      Objectives  In October 2011 the Russian GLONASS(global navigation satellite system) orbital constellation of 24 satellites is restored, enabling global coverage for positioning, navigation and timing for civil users once again. It plays key roles in navigation system performance evaluation, integrity monitoring, determination and prediction of satellite clock correction. To analyze the time-frequency characteristics of GLONASS in-flight satellite clocks, GLONASS satellites are equipped with cesium clocks, which are different from GPS, Galileo and BDS(BeiDou navigation satellite system) satellites, so GLONASS in-flight Cesium clock may have quite different time-frequency characteristics. However, analysis and evaluation are rarely reported about GLONASS satellite clocks.
      Methods  In order to estimate the behavior and state of GLONASS in-flight satellite clocks, the long-term characterization of the GLONASS in-orbit Cesium clocks is carried out in terms of the long-term variations of the five indices, namely clock phase, frequency, frequency drift, frequency stability and clock model noise. In view of the availability and accuracy of GLONASS satellite clock data, the precise GLONASS satellite clock products from Jan. 1, 2016 to May 11, 2019 with 5-minute interval released by the Russian GLONASS Information and Analysis Center for Positioning, Navigation and Timing are used as data base to derive the clock phase, frequency, frequency drift and clock model noise from the quadratic polynomial model, as well as calculate the clock frequency stability at the short interval according to the classical Hadamard deviation.
      Results  It is clearly shown that the phase and frequency of the GLONASS on-board Cesium clocks are very stable. The average values of the model noise and frequency drift of the GLONASS in-orbit clocks are 0.7 ns and 5.94×10-15/d, respectively. The results demonstrate that GLONASS Cesium clocks have good physical characteristics.The frequency stability of the GLONASS satellite clocks in orbit is at the 10-13 level at short interval, and there is noticeable relationship between the frequency stability and clock model noise, which will be needed to clarify further.
      Conclusions  The results show that the physical characteristics of new satellite clocks are better than that of older clocks, and the clock model noise are also substantially lower.

     

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