Consistent estimation of geodetic parameters from SLR satellite constellation measurements
Consistent estimation of geodetic parameters from SLR satellite constellation measurements
复制标题
DOI：
10.1007/s00190-018-1166-7
复制
发表时间：
2018-09-01
影响因子：
4.4
通讯作者：
Seitz, Manuela
中科院分区：
文献类型：
--
作者：
Blossfeld, Mathis;Rudenko, Sergei;Seitz, Manuela
在本文中，我们一致地估计大地参数，如每周的3-D站坐标，地球定向参数（EOP），包括每日的x/y极坐标和一天的多余长度，并选择每周地球的重力场（斯托克斯）系数高达度和阶6从卫星激光测距测量到多达11个大地测量卫星。SLR星座由LAGEOS-1/2，Etalon-1/2，Stella，Starlette，Ajisai，Larets，LARES，BLITS和WESTPAC组成，其观测时间跨度为38年，从1979年2月16日到2017年4月30日。如果将具有不同高度和轨道倾角的多个卫星组合，则估计参数之间的相关性显著降低。这使我们能够（一）调查卫星星座的能力，以减少现有的相关性和（二）估计可靠的参数，更高的精度相比，标准的4-卫星星座（LAGEOS-1/2，标准-1/2），这是目前使用的国际激光测距服务确定的地球参考框架（TRF）和EOP产品。特别是改进了与卫星特定轨道参数高度相关的Stokes系数、EOP和TRF基准参数（三个平移、三个旋转、一个比例因子）。从我们的调查中，我们发现，与上述4个卫星的解决方案相比，11个卫星的解决方案的TRF基准参数的分散度降低了37%，转换残差降低了22%，EOP的分散度降低了22%，它们的平均值降低了84%。参考解决方案。最大的改进是获得的斯托克斯系数，显着受益于多个卫星（倾角和轨道高度）的组合。总的来说，单个系数提高了93%，整体提高了74%。此外，可以清楚地发现，Ajisai由于错误的质心校正而显著地干扰了TRF解。我们进一步量化了特定卫星对确定不同大地测量参数的影响，并最终评估了现有SLR跟踪球形卫星星座支持GGOS目标的潜力。
In this paper, we consistently estimate geodetic parameters such as weekly 3-D station coordinates, Earth orientation parameters (EOP) including daily x/y-pole coordinates and the excess length of day , and selected weekly Earth's gravitational field (Stokes) coefficients up to degree and order 6 from Satellite Laser Ranging measurements to up to 11 geodetic satellites. The SLR constellation consists of LAGEOS-1/2, Etalon-1/2, Stella, Starlette, Ajisai, Larets, LARES, BLITS and WESTPAC, and its observations cover a time span of 38 years ranging from February 16, 1979, to April 30, 2017. If multiple satellites with various altitudes and orbit inclinations are combined, correlations between estimated parameters are significantly reduced. This allows us (i) to investigate the ability of satellite constellations to reduce existing correlations and (ii) to estimate reliable parameters with higher precision compared to the standard 4-satellite constellation (LAGEOS-1/2, Etalon-1/2) which is currently used by the International Laser Ranging Service for the determination of the Terrestrial Reference Frame (TRF) and EOP products. In particular, the Stokes coefficients, EOP and TRF datum parameters (three translations, three rotations, one scale factor), which are highly correlated with satellite-specific orbit parameters, are improved. From our investigations, we found for an 11-satellite solution compared to the above-mentioned 4-satellite solution a decrease in the scatter of the TRF datum parameters of up to 37%, the transformation residuals are decreased by up to 22%, the scatter of the EOP is decreased by up to 22%, and their mean values are decreased by up to 84% w.r.t. the reference solutions. The largest improvement is obtained for the Stokes coefficients which significantly benefit from a combination of multiple satellites (inclinations and orbit altitudes). In total, single coefficients are improved by up to 93% and the overall improvement is up to 74%. Moreover, it could be clearly identified that Ajisai significantly disturbs the TRF solution due to an erroneous center-of-mass correction. We further quantify the impact of specific satellites on the determination of different geodetic parameters and finally evaluate the potential of the existing SLR-tracked spherical satellite constellation to support the goals of GGOS.