木星探测器Juno精密定轨分析及低阶引力场解算

随着中国深空测控技术的进步和深空探测计划的推进，木星探测计划已经进入日程，木星探测器的精密定轨和木星的引力场的解算是木星探测中的重要研究内容。首先给出了木星探测器的坐标系统和动力学模型，并利用已公布的朱诺号木星探测器精密星历数据进行验证，动力学拟合结果与参考星历的位置偏差在10 m量级，速度偏差小于6 mm/s；然后利用深空多普勒测量模型处理已经发布的朱诺号无线电测量数据进行精密定轨，结果与参考星历的差距在数百米量级；最后利用仿真数据验证引力场系数解算的可靠性，并利用朱诺号探测器4个近木点附近的实测数据解算引力场系数，得到了截至8阶的带谐项系数。

Trajectory Estimation Analysis and Low Degree Gravity Field Recovery Based on Juno Tracking Data

  Objectives  With the development of deep-space technology of China, the Jupiter exploration program has been added into the schedule. The precise orbit determination (POD) and gravity field recovery play an important role in Jupiter exploration.  Methods  This paper focuses on the precise orbit determination of Juno and low degree gravity field recovery of Jupiter. Firstly, the coordinate system and dynamics model of the Jupiter probe are given, and the Juno precision ephemeris of jet propulsion laboratory (JPL) is used for verification.Then, the deep-space Doppler measurement model is presented and the trajectory of Juno is calculated by using the tracking data.  Results  The dynamical fitting position difference is on the order of 10 m, and the velocity difference is less than 6 mm/s. The difference with the reference orbit given by JPL is better than 1 kilometer.  Conclusions  The simulation data is used to verify the reliability of gravity field solution, and the measured data near 4 perijove points of the Juno is used to calculate the gravity field coefficients of Jupiter, obtaining the gravity fieldzonal coefficients up to 8 degrees.