Satellite laser ranging - a tool to realize GGOS?
Satellite laser ranging - a tool to realize GGOS?
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卫星激光测距——实现GGOS的利器？
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
M. Gerstl
中科院分区：
文献类型：
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作者：
M. Bloßfeld;V. Štefka;H. Müller;M. Gerstl
卫星激光测距(SLR)是目前唯一一种从一个观测方程中高精度地确定地球重力场的台站坐标、地球方位参数和斯托克斯系数的技术。这些参数构成了全球大地观测系统(GGOS)的所谓“三大支柱”(Plag和Pearlman，2009)。作为国际激光测距服务(ILRS)的官方分析中心(皮尔曼等人，2002年)，DGFI正在开发和维护被称为“DGFI轨道和大地测量参数估计软件”(DOGES)的处理SLR观测的软件。该软件用于分析SLR观测并计算多卫星解。在这项研究中，组合了多达10颗具有不同轨道特性(例如倾角和高度)的卫星(ETALON1/2、LAGEOS1/2、STELLA、STARLET、AJISAI、LARETS、LARES和BLITS)。使用方差分量估计来完成卫星的相对加权。不同的轨道可以降低重力场系数(GFCs)和EOPs等参数的相关性。除了地球重力场(每周GFC的度数和阶数为≤6，每月的GFC度数和阶数为≤20)和自转(地球极坐标，用LOD外推的地球极坐标，Ut1-UTC)外，三维空间站的坐标是每周或每月估计的。将不同的组合解决方案与仅使用LAGEOS的解决方案进行比较。如果LARES与LAGEOS1/2相结合，则可显著改善GFC、EOP和TRF。如果合并更多的卫星，极坐标的变化将是W.r.t.IERS 08 C04时间序列最多可减少56%。此外，LOD中的系统学几乎完全消除。测站坐标的变化。SLRF2008(http://www.ilrs.gsfc.nasa.gov/science/awg/SLRF2008.html，2013)可以减少约30%.
Satellite Laser Ranging (SLR) is currently the unique technique to determine station coordinates, Earth Orientation Parameters (EOPs) and Stokes coefficients of the Earth’s gravity field from one observation equation with a high accuracy. These parameters form the so-called ‘three pillars’ (Plag and Pearlman, 2009) of the Global Geodetic Observing System (GGOS). In its function as an official analysis center of the International Laser Ranging Service (ILRS) (Pearlman et al., 2002), DGFI is developing and maintaining software to process SLR observations called ‘DGFI Orbit and Geodetic parameter estimation Software’ (DOGS). The software is used to analyze SLR observations and to compute multi-satellite solutions. In this study, up to 10 satellites (ETALON1/2, LAGEOS1/2, STELLA, STARLETTE, AJISAI, LARETS, LARES and BLITS) with different orbit characteristics (e.g., inclination and altitude) are combined. The relative weighting of the satellites is done using a variance component estimation. The diverse orbits allow to decrease the correlation of parameters such as gravity field coefficients (GFCs) and EOPs. Beside the Earth’s gravity field (weekly GFCs with degree and order ≤ 6 and monthly GFCs with degree and order ≤ 20) and rotation (terrestrial pole coordinates, UT1-UTC extrapolated with LOD), 3-D station coordinates are estimated weekly or monthly. Different combined solutions are compared to LAGEOS-only solutions. If LARES is combined with LAGEOS1/2, a significant improvement in the GFCs, the EOP and the TRF can be achieved. If more satellites are combined, the variation of the pole coordinates w.r.t. the IERS 08 C04 time series can be reduced up to 56%. Furthermore, systematics in LOD are nearly completely eliminated. The variation of the station coordinates w.r.t. SLRF2008 (http://www.ilrs.gsfc.nasa.gov/science/awg/SLRF2008.html, 2013) can be reduced by about 30%.
历元和多年参考系中的非线性台站运动
影响因子：
4.4
作者：
Bloßfeld M;M. Seitz;D. Angermann
通讯作者：
D. Angermann