| 星间加速度解算模式的模拟与分析 |
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| 引用本文： | 沈云中,许厚泽,吴斌.星间加速度解算模式的模拟与分析[J].地球物理学报,2005,48(4):807-811. |
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| 作者姓名： | 沈云中 许厚泽 吴斌 |
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| 作者单位： | 同济大学测量系,上海,200092;中国科学院测量与地球物理研究所,武汉,430077 |
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| 基金项目： | 国家自然科学基金项目(40234039)资助. |
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| 摘 要： | 低低卫星跟踪卫星的观测量是两低轨卫星的星间距离或星间速度，星间加速度由星间速度通过数值微分导出，用星间加速度作为观测量可以避免解算卫星运动的变分方程，简化观测方程的建立，但数值微分会使观测噪声放大，从而影响重力位的解算精度.为了定量给出星间加速度观测模式的精度，本文分析并模拟验证了数值微分公式计算星间加速度的精度，导出了基于星间加速度的一般形式的观测方程，模拟计算了基于星间加速度的重力位模型.结果表明，采用星间加速度观测模式的解算精度要明显低于星间速度观测模式的解算精度.
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| 关 键 词： | 卫星重力 低低跟踪模式 模拟分析 |
| 文章编号： | 0001-5733(2005)04-0807-05 |
| 收稿时间： | 2004-08-07 |
| 修稿时间： | 2005-03-12 |
Simulation of recovery of the geopotential model based on intersatellite acceleration data in the low-low satellite to satellite tracking gravity mission |
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| SHEN Yun-zhong,XSU Hou-Ze,WU Bin.Simulation of recovery of the geopotential model based on intersatellite acceleration data in the low-low satellite to satellite tracking gravity mission[J].Chinese Journal of Geophysics,2005,48(4):807-811. |
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| Authors: | SHEN Yun-zhong XSU Hou-Ze WU Bin |
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| Institution: | 1.Department of Surveying and Geomatics, Tongji University, Shanghai 200092, China 2 Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China |
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| Abstract: | In the low-low satellite to satellite gravity mission, the intersatellite range and range-rate data are the observable values, while the intersatellite acceleration can be derived from the range-rate through digital differential. Using acceleration data, people can avoid solving the variational equations of the satellite motion and simplify the observation equations. But on the other side, the digital differential will amplify the observation noises and finally affect the solved geopotential accuracy. In order to give a quantitative answer, this paper analyses and tests the accuracy of calculated acceleration by digital differential, derives the general observation equations with the intersatellite acceleration and simulates the geopotential solution based on the acceleration data. The results show that the solution accuracy by using the acceleration observation is much lower than the accuracy obtained from the range-rate observation. |
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| Keywords: | Satellite gravimetry Low-low satellite to satellite tracking mode Simulation and analysis |
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