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首页> 外文期刊>Journal of Geodesy >Calibration and validation of individual GOCE accelerometers by precise orbit determination
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Calibration and validation of individual GOCE accelerometers by precise orbit determination

机译：通过精确的轨道确定来校准和验证单个GOCE加速度计

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摘要

The European Space Agency Gravity field and steady-state Ocean Circular Explorer (GOCE) carries a gradiometer consisting of three pairs of accelerometers in an orthogonal triad. Precise GOCE science orbit solutions (PSO), which are based on satellite-to-satellite tracking observations by the Global Positioning System and which are claimed to be at the few cm precision level, can be used to calibrate and validate the observations taken by the accelerometers. This has been done for each individual accelerometer by a dynamic orbit fit of the time series of position co-ordinates from the PSOs, where the accelerometer observations represent the non-gravitational accelerations. Since the accelerometers do not coincide with the center of mass of the GOCE satellite, the observations have to be corrected for rotational and gravity gradient terms. This is not required when using the so-called common-mode accelerometer observations, provided the center of the gradiometer coincides with the GOCE center of mass. Dynamic orbit fits based on these common-mode accelerations therefore served as reference. It is shown that for all individual accelerometers, similar dynamic orbit fits can be obtained provided the above-mentioned corrections are made. In addition, accelerometer bias estimates are obtained that are consistent with offsets in the gravity gradients that are derived from the GOCE gradiometer observations.
机译：欧洲航天局的重力场和稳态海洋圆环探测器（GOCE）带有一个梯度计，该梯度计由三对正交三轴加速度计组成。精确的GOCE科学轨道解决方案（PSO）基于全球定位系统的卫星到卫星跟踪观测结果，据称精度达到几厘米，可用于校准和验证卫星观测到的观测结果加速度计。通过对PSO位置坐标的时间序列进行动态轨道拟合，可以对每个单独的加速度计进行此操作，其中加速度计的观测值表示非重力加速度。由于加速度计与GOCE卫星的质心不一致，因此必须对观测值的旋转和重力梯度项进行校正。如果使用梯度计的中心与GOCE质心重合，则在使用所谓的共模加速度计观测值时不需要这样做。因此，基于这些共模加速度的动态轨道拟合将作为参考。结果表明，对于所有单独的加速度计，只要进行上述校正，就可以获得类似的动态轨道拟合。此外，获得的加速度计偏差估算值与从GOCE梯度计观测值得出的重力梯度偏移量一致。

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