An improved solution of the gravity field of Mars (GMM‐2B) from Mars Global Surveyor
An improved solution of the gravity field of Mars (GMM‐2B) from Mars Global Surveyor
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DOI：
10.1029/2000je001426
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发表时间：
2001-10
影响因子：
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通讯作者：
F. LeMoine;David E. Smith;D. Rowlands;M. Zuber;G. Neumann;D. Chinn;D. Pavlis
中科院分区：
文献类型：
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作者：
F. LeMoine;David E. Smith;D. Rowlands;M. Zuber;G. Neumann;D. Chinn;D. Pavlis
利用1997年10月至2000年2月火星全球探测器(MGS)的X波段跟踪数据和1999年3月至12月火星轨道器激光高度计(MOLA)数据形成的高度计交叉点，推导出了80阶火星重力场的球谐解-戈达德火星模型2B(GMM-2B)。在测绘任务期间，MGS位于近极(倾角92.9°)和近圆形轨道上，平均高度为400公里。来自该轨道的跟踪数据提供了火星重力场的详细、全球和高分辨率图像。即使没有考拉幂定律的约束，火星引力解也是稳定的，达到60×60。海军陆战队山谷明显得到解决，低至−450MGals。奥林匹斯山及其极光都是单独分解的，火山的峰值异常为2950 MGals。GMM-2B重力系数与MOLA地形的全球相关性为0.78到60度，相关系数保持在0.6到62度以上。由GMM-2B误差协方差通过60×60预测的全球重力异常误差为11mgAl。从GMM-2B到60×60的全球大地水准面误差为1.8m，利用GMM-2B测量的MGS轨道质量，由重叠的轨道弧测得，径向为1m，总位置为10m。
A spherical harmonic solution of the Mars gravity field to degree and order 80, Goddard Mars Model 2B (GMM-2B), has been developed using X band tracking data of Mars Global Surveyor (MGS) from October 1997 to February 2000 and altimeter crossovers formed from the Mars Orbiter Laser Altimeter (MOLA) data between March and December 1999. During the mapping mission, MGS was located in a near-polar (92.9° inclination) and near-circular orbit at a mean altitude of 400 km. The tracking data from this orbit provide a detailed, global, and high resolution view of the gravity field of Mars. Mars gravity solutions are stable to 60×60 even without application of a Kaula power law constraint. The Valles Marineris is resolved distinctly with lows reaching −450 mGals. Olympus Mons and its aureole are both separately resolved, and the volcano has a peak anomaly of 2950 mGals. The global correlation of the GMM-2B gravity coefficients with MOLA-derived topography is 0.78 through degree 60, and the correlation remains above 0.6 through degree 62. The global gravity anomaly error predicted from the GMM-2B error covariance through 60×60 is 11 mGal. The global geoid error from GMM-2B through 60×60 is 1.8 m. MGS orbit quality using GMM-2B, as measured by overlapping orbital arcs, is 1 m in the radial direction and 10 m in total position.