A method to calculate zero-signature satellite laser ranging normal points for millimeter geodesy - a case study with Ajisai
A method to calculate zero-signature satellite laser ranging normal points for millimeter geodesy - a case study with Ajisai
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DOI：
10.1186/s40623-015-0204-4
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发表时间：
2015-03-01
影响因子：
3
通讯作者：
Koidl, Franz
中科院分区：
文献类型：
--
作者：
Kucharski, Daniel;Kirchner, Georg;Koidl, Franz
高重复频率卫星激光测距技术为距离测量的后处理提供了新的可能。为了提高主要SLR数据产品--正常点的准确度和精度，我们对奥地利格拉茨SLR站发射的大地卫星味集赛11年的KHzSLR通道进行了分析。通过三种不同的方法计算正常点：1)标准2.5西格玛滤光片接受的距离残差，2)前沿滤光片接受的距离残差，3)味赛单角立方反射器(CCR)面板给出的距离残差。通过比较所得结果的统计参数，从单反射角数据分布的前沿选取距离测量值，可以最小化卫星签名效应，并将每个正常点的平均单炮均方根从15.44 mm减小到4.85 mm。前缘平均反射点到卫星质心的光学距离为1023 mm，均方根=1.7 mm。此外，在后处理过程中，我们利用味赛的完整姿态模型，可以选择卫星单个CCR面板的距离测量，并形成最接近地面站与味赛质心物理距离的正常点。该方法从拟合后距离残差的分布中消除了卫星信号的影响，进一步将每个正常点的平均单炮均方根值提高到3.05 mm。每一次通过的正常点RMS从2.97毫米减少到0.06毫米-这是零签名卫星的预期值。
High repetition-rate satellite laser ranging (SLR) offers new possibilities for the post-processing of the range measurements. We analyze 11 years of kHz SLR passes of the geodetic satellite Ajisai delivered by Graz SLR station (Austria) in order to improve the accuracy and precision of the principal SLR data product - normal points. The normal points are calculated by three different methods: 1) the range residuals accepted by the standard 2.5 sigma filter, 2) the range residuals accepted by the leading edge filter and 3) the range residuals given by the single corner cube reflector (CCR) panels of Ajisai.A comparison of the statistical parameters of the obtained results shows that the selection of the range measurements from the leading edge of the SLR data distribution allows to minimize the satellite signature effect and to reduce the average single-shot RMS per normal point from 15.44 to 4.85 mm. The optical distance between the leading edge mean reflection point and the satellite's center of mass is 1,023 mm, RMS = 1.7 mm.Further, in addition, we utilize the complete attitude model of Ajisai during the post-processing which enables selection of the range measurements to the single CCR panels of the satellite and the formation of the normal points which most closely approximate the physical distance between the ground station and the center of mass of Ajisai. This method eliminates the satellite signature effect from the distribution of the post-fit range residuals and further improves the average single-shot RMS per normal point to 3.05 mm. The normal point RMS per pass is reduced from 2.97 to 0.06 mm - a value expected for a zero-signature satellite.