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中文摘要：
基于火星探测器精密定轨及火星重力场研究的重要意义,利用MGS（Marsglobalsurveyor）测图任务阶段近两个月的轨道跟踪数据进行解算分析,通过重复弧段差异分析对精密定轨结果进行了精度评价。在此基础上,进行火星重力场模型解算。通过重力场功率谱、轨道残差和火星自由空气重力异常对解算模型进行精度评价,结果表明解算模型合理,近两个月轨道跟踪数据可以提取主要的火星重力场信息。
英文摘要：
Considering the importance of Mars spacecraft POD and Martian gravity field,POD of MGS（Mars global surveyor）is done using nearly two months tracking data during mapping phase,and the accuracy of orbital result is evaluated by orbital overlap analysis.In following Martian gravity field model is solved,and the model accuracy is assessed by methods such as gravity power spectrum,orbital residuals and Mars free-air gravity anomaly.The results show the reasonability of the solution,and dominating Martian gravity field information can be extracted by nearly two months tracking data.
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