PRECISION ORBIT DETERMINATION FOR TOPEX/POSEIDON
PRECISION ORBIT DETERMINATION FOR TOPEX/POSEIDON
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DOI：
10.1029/94jc01645
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发表时间：
1994-12-15
影响因子：
3.6
通讯作者：
ZELENSKY, NP
中科院分区：
文献类型：
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作者：
TAPLEY, BD;RIES, JC;ZELENSKY, NP
TOPEX/Poseidon任务目标要求以优于13厘米均方根值的精度确定航天器的径向位置。这一严格要求比TOPEX/Poseidon任务定义之前任何高度计任务所达到的精度低一个数量级。为了实现这一目标，在科罗拉多大学和喷气推进实验室的合作下，美国国家航空航天局戈达德空间困境中心和奥斯汀德克萨斯大学共同努力建立了TOPEX精密轨道确定小组。在发射前开发和发射后验证阶段，POD团队改进、校准和验证了精密轨道确定计算机软件系统。所取得的成就包括：(1)提高了重力和表面力模型的精度；(2)改进了激光测距和多普勒跟踪系统的性能。这些努力的结果导致TOPEX/Poseidon的轨道精度大大好于最初的任务要求。基于数据拟合、协方差分析和轨道比较的测试表明，确定了TOPEX/Poseidon航天器相对于地球质心的径向分量，均方根误差在3至4厘米RMS范围内。这种轨道精度，再加上这次任务的近乎连续的双频测高，提供了以前所未有的精度确定海洋动态地形的手段。
The TOPEX/POSEIDON mission objective requires that the radial position of the spacecraft be determined with an accuracy better than 13 cm RMS (root mean square). This stringent requirement is an order of magnitude below the accuracy achieved for any altimeter mission prior to the definition of the TOPEX/POSEIDON mission. To satisfy this objective, the TOPEX Precision Orbit Determination (POD) Team was established as a joint effort between the NASA Goddard Space Plight Center and the University of Texas at Austin, with collaboration from the University of Colorado and the Jet Propulsion Laboratory. During the prelaunch development and the postlaunch verification phases, the POD team improved, calibrated, and validated the precision orbit determination computer software systems. The accomplishments include (I) increased accuracy of the gravity and surface force models and (2) improved performance of both the laser ranging and Doppler tracking systems. The result of these efforts led to orbit accuracies for TOPEX/POSEIDON which are significantly better than the original mission requirement. Tests based on data fits, covariance analysis, and orbit comparisons indicate that the radial component of the TOPEX/POSEIDON spacecraft is determined, relative to the Earth's mass center, with an RMS error in the range of 3 to 4 cm RMS. This orbit accuracy, together with the near continuous dual-frequency altimetry from this mission, provides the means to determine the ocean's dynamic topography with an unprecedented accuracy.