Observation-Based Attitude Realization for Accurate Jason Satellite Orbits and Its Impact on Geodetic and Altimetry Results
Observation-Based Attitude Realization for Accurate Jason Satellite Orbits and Its Impact on Geodetic and Altimetry Results
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DOI：
10.3390/rs12040682
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发表时间：
2020-02
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影响因子：
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通讯作者：
M. Bloßfeld;J. Zeitlhöfler;S. Rudenko;D. Dettmering
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文献类型：
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作者：
M. Bloßfeld;J. Zeitlhöfler;S. Rudenko;D. Dettmering
对于低地球轨道的卫星来说，非引力导致了最大的扰动加速之一。在精密定轨(POD)中，由于卫星的有效截面积与摄动加速度直接相关，因此对星体姿态和太阳帆板方位的精确建模是非常重要的。此外，安装在卫星体内的跟踪仪器的位置会受到卫星姿态的影响。对于Jason-1/-2/-3这样的卫星，姿态信息有两种形式--所谓的标称偏航转向模型和基于观测的(由恒星跟踪相机测量的)航天器主体方位和太阳能电池板旋转角的四元数。在这项研究中，我们开发了一个对公开的卫星姿态信息进行预处理的程序。我们基于对Jason卫星的卫星激光测距(SLR)观测计算了轨道，总时间间隔约为25年，使用两颗卫星的姿态表示法。在轨道分析的基础上，我们研究了使用基于观测的姿态预处理和使用名义偏航操纵模型对POD的影响。使用基于观测的卫星姿态数据计算的所有轨道弧线中，大约75%的残差的均方根(RMS)较小。更准确地说，得到的轨道显示与名义姿态实现相比，单反观测残差的总体任务均方根改善了5.93%(Jason-1)、8.27%(Jason-2)和4.51%(Jason-3)。除了卫星轨道外，估计的台站坐标也得益于姿态处理的精细化，即在龙顶期，台站的重复性明显提高。此外，测高分析表明，单星交叉差异有了明显的改善(Jason-1/-2/-3的绝对差异平均值分别减少了6%、15%和16%，标准偏差分别减少了1.2%、2.7%和1.3%)。如有需要，可提供经过处理的姿态数据。
For low Earth orbiting satellites, non-gravitational forces cause one of the largest perturbing accelerations. During a precise orbit determination (POD), the accurate modeling of the satellite-body attitude and solar panel orientation is important since the satellite’s effective cross-sectional area is directly related to the perturbing acceleration. Moreover, the position of tracking instruments that are mounted on the satellite body are affected by the satellite attitude. For satellites like Jason-1/-2/-3, attitude information is available in two forms—as a so-called nominal yaw steering model and as observation-based (measured by star tracking cameras) quaternions of the spacecraft body orientation and rotation angles of the solar arrays. In this study, we have developed a preprocessing procedure for publicly available satellite attitude information. We computed orbits based on Satellite Laser Ranging (SLR) observations to the Jason satellites at an overall time interval of approximately 25 years, using each of the two satellite attitude representations. Based on the analysis of the orbits, we investigate the influence of using preprocessed observation-based attitude in contrast to using a nominal yaw steering model for the POD. About 75% of all orbital arcs calculated with the observation-based satellite attitude data result in a smaller root mean square (RMS) of residuals. More precisely, the resulting orbits show an improvement in the overall mission RMS of SLR observation residuals of 5.93% (Jason-1), 8.27% (Jason-2) and 4.51% (Jason-3) compared to the nominal attitude realization. Besides the satellite orbits, also the estimated station coordinates benefit from the refined attitude handling, that is, the station repeatability is clearly improved at the draconitic period. Moreover, altimetry analysis indicates a clear improvement of the single-satellite crossover differences (6%, 15%, and 16% reduction of the mean of absolute differences and 1.2%, 2.7%, and 1.3% of their standard deviations for Jason-1/-2/-3, respectively). On request, the preprocessed attitude data are available.