徐晓华, 李征航, 罗佳. GPS掩星数据反演中的地球扁率影响改正[J]. 武汉大学学报 ( 信息科学版), 2005, 30(6): 502-505.
引用本文: 徐晓华, 李征航, 罗佳. GPS掩星数据反演中的地球扁率影响改正[J]. 武汉大学学报 ( 信息科学版), 2005, 30(6): 502-505.
XU Xiaohua~(, ) LI Zhenghang~(, . Correction of Effect of Earth’s Oblateness in Inversion of GPS Occultation Data[J]. Geomatics and Information Science of Wuhan University, 2005, 30(6): 502-505.
Citation: XU Xiaohua~(, ) LI Zhenghang~(, . Correction of Effect of Earth’s Oblateness in Inversion of GPS Occultation Data[J]. Geomatics and Information Science of Wuhan University, 2005, 30(6): 502-505.

GPS掩星数据反演中的地球扁率影响改正

Correction of Effect of Earth’s Oblateness in Inversion of GPS Occultation Data

  • 摘要: 采用CHAMP实测轨道数据和MSISE90经验干大气模型,分别将地球作为圆球和椭球,前向模拟了附加相位延迟,然后对模拟数据进行反演。通过不同方案下反演温度廓线与大气模型温度廓线的比较,发现实测掩星数据的反演中,忽略地球扁率影响会给温度反演结果带来较大的误差;而采用相应方法对地球扁率影响进行改正后,温度廓线的误差明显减弱,从而证明了改正方法的正确性。

     

    Abstract: The effect of Earth’s oblateness in the inversion of GPS occultation data and corresponding correcting method are studied. By using observed CHAMP orbit ephemeredes and MSISE-90 dry air model and regarding Earth as a sphere and an ellipsoid respectively, excess phase delays are simulated and the simulated data are retrieved under different schemes. The comparisons between the Inverted temperature profiles and the model temperature profiles show that when inverting observed data, we will get temperature results with large errors if the effect of Earth’s oblateness is omitted. The correction method is tested useful because the temperature errors decreased obviously with this method.

     

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