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首页> 外文期刊>GPS Solutions >Determination of near real-time GNSS satellite clocks for the FORMOSAT-7/COSMIC-2 satellite mission
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Determination of near real-time GNSS satellite clocks for the FORMOSAT-7/COSMIC-2 satellite mission

机译：用于Formosat-7 / Cosmic-2卫星使命的近实时GNSS卫星时钟的确定

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In this study, we determine the near real-time (NRT) clocks of the Global Positioning System (GPS) and Globalnaya Navi-gatsionnaya Sputnikovaya Sistema (GLONASS) satellites in the Taiwan RO Process System (TROPS), which is mainly designed for the data processing in both the FORMOSAT-3/COSMIC (F3C) and FORMOSAT-7/COSMIC-2 (F7C2) satellite missions. The accuracy of GNSS clocks defines the quality of the atmospheric excess phase, which is used for the retrieval of bending angle profiles in GNSS radio occultation (RO) observations. The accuracy of the NRT GNSS clocks is assessed by comparing the clock rate, clock stability and clock-induced positioning error on receivers with the final solutions given by the European Space Agency (ESA). Overall, the standard deviations of the clock rates from TROPS agree with those from ESA within 0.05 mm/s over 2304 clock solutions. Additionally, we find that the clock stability of the GPS Block IIF type (3 x 10(-13)) is an order of magnitude better than that of IIR Block types (3 x 10(-12)) over a time interval of 30 s. In comparison, the stabilities of GLONASS clocks are approximately 3 x 10(-12). We quantify the NRT clock error on the receiver positioning by using the precise point positioning technique obtained from the Bernese GNSS software. The 3-dimensional clock-induced positioning error is approximately 3.3, 3.2 and 0.9 cm for station AUCK and 6.9, 6.3 and 3.1 cm for station NRC1 for the GPS-only, GLONASS-only and GPS + GLONASS cases, respectively. For GNSS-RO applications, the bending angle profiles derived using TROPS GPS clocks agree with the COSMIC Data Analysis and Archive Center products to within 0.01-1.00 mu rad. However, this is not the case for the GLONASS clock, because the GLONASS clock-induced errors on the RO profile are 10-100 times greater than those induced by the GPS clock. This suggests that different weightings should be used for RO applications, such as data assimilation, when different satellite clocks ar
机译：在这项研究中，我们确定了全球定位系统（GPS）和GlobalNaya Navi-Gatsionnaya Sputnikovaya Sistema（Glonass）卫星​​（Glonass）卫星​​在台湾Ro Process System（TROPS）中的近实时（NRT）钟表，这主要是为此设计的Formosat-3 / Cosmic（F3C）和Formosat-7 / Cosmic-2（F7C2）卫星任务中的数据处理。 GNSS时钟的准确性定义了大气过量相的质量，用于检索GNSS无线电掩星（RO）观察中的弯曲角度配置。通过将接收器上的时钟速率，时钟稳定性和时钟引起的定位误差与欧洲航天器（ESA）给出的最终解决方案进行比较来评估NRT GNSS时钟的准确性。总体而言，时钟率从拖网的标准偏差与来自2304个时钟解决方案的0.05 mm / s的ESA中的标准偏差。此外，我们发现GPS块IIF类型（3×10（-13））的时钟稳定性比IIR块类型（3×10（-12））在30的时间间隔内更好s。相比之下，Glonass时钟的稳定性约为3×10（-12）。通过使用从Bernese GNSS软件中获得的精确点定位技术来量化接收器定位的NRT时钟误差。 3维时钟诱导的定位误差为Auck的站点为3.3,3.2和0.9厘米，对于仅用于GPS的GPS，仅GPS，仅限GPS + GLONASS案例。对于GNSS-RO应用，使用TROPS GPS时钟导出的弯曲角度分布在0.01-1.00 mu RAD中同意宇宙数据分析和存档中心产品。但是，这不是Glonass时钟的情况，因为RO轮廓上的Glonass时钟引起的误差比GPS时钟引起的10-100倍。这表明，当不同卫星时钟AR时，应使用不同的权重，例如数据同化。

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