基于“嫦娥一号”跟踪数据的月球重力场模型CEGM-01

Lunar gravity field model CEGM-01 based on tracking data of Chang'E-1

本文介绍了"嫦娥一号"月球探测卫星轨道跟踪数据的特征,简要阐述了基于动力法精密定轨解算月球重力场模型的原理及策略.在"嫦娥一号"测控数据精度和覆盖均有限的条件下,独立使用"嫦娥一号"月球探测器6个月的在轨运行双程测距测速跟踪数据,成功得到了50阶次月球重力场模型CEGM-01.通过多种方式,如重力场模型频谱特性、实测数据定轨残差、月球重力异常特征、与地形的相关性及导纳值,对解算得到的CEGM-01月球重力场模型进行了精度评价,分析了相应的物理特性和效果.结果表明了CEGM-01解算过程的有效合理.在此基础上展望了我国月球重力场探测未来可能的发展方向.

The characteristic of Chang＇E-1 orbital tracking data is presented in this paper, and the principle and solution strategy of lunar gravity field recovery based on dynamical precise orbit determination are summarized. Under the condition of limited accuracy and coverage of tracking data of Chang＇ E-I, a lunar gravity field model CEGM-01 up to degree and order 50 is solved independently using six months tracking data. The accuracy of the model CEGM-01 is assessed by multi-means, such as gravity power spectrum, observational residuals after precision orbit determination, lunar surface gravity anomaly character, admittance/coherence with topography model, and the corresponding physical feature and effect are analyzed. The results indicate the effectiveness and reasonability of CEGM-01 solution process. On the basis of current work the prospect of future development of our national lunar gravity field detection is presented.