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中文摘要：
以CHAMP低轨卫星的真实轨道为基础，通过数值积分实例计算研究了卫星轨道数值积分技术对卫星初始状态向量的精度要求，同时分析了卫星受力模型及其模型参数误差对轨道积分的影响，即分析了定轨解算的稳定性问题。计算结果表明，不同的卫星初始状态参数和力模型参数对轨道形状的变动均有较大影响，轨道积分尤其对卫星初始状态参数的敏感性最大。
英文摘要：
Based on the theory of variation equation, precise low satellite orbit and Earth gravity field model can be determined by using numerical integration technology. Feasibilities and requirements of the algorithm are analyzed by numerical evaluation. Using CHAMP real orbit data, some calculations were performed for studying the influence of initial orbit vec- tors precise, the force model, and force model parameters errors. The results show that the error of initial orbit vectors and force model parameters are the critical factors and have a great influence on satellite orbit shapes, especially numerical integration is highly sensitivity to initial orbit vector errors.
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