利用多普勒测量确定嫦娥四号着陆器精密定轨

针对嫦娥四号着陆器环月飞行阶段的轨道，开展基于多普勒测量数据的精密轨道计算与精度分析。首先给出了多普勒测量数据的精确观测建模方法。然后，从着陆器姿控力影响，重叠弧段轨道比较，以及独立轨道比较几个方面开展计算与分析，结果表明：姿控喷气会对探测器产生细微的加速度，对轨道计算产生20~50 m的影响；通过重叠弧段的比较，稳定飞行阶段多普勒数据独立解算轨道的精度优于30 m；与测距与VLBI测量联合解算轨道的比较，轨道之间的差异小于50 m。

Orbit Determination of Chang’E 4 Lander Using Doppler Measurement

For the orbit of Chang’E-4 lander around the Moon, the precision orbit determination and accuracy analysis is performed based upon Doppler measurements. The algorithm for high precision Doppler modeling is proposed. The Doppler measurements of Chang’E-4 during lunar flight phase are processed in this paper, including the following three aspects: the influence of attitude control, orbital overlap and comparison with independent orbit. The results show that the reaction jet attitude control can accelerate the spacecraft slightly and 〖JP2〗affect the orbital calculation by 20~50 m. By overlap comparison, the accuracy of independent orbit calculation with Doppler data during the stable flight phase is better than 30 m. Compared with the joint orbital calculation with ranging and VLBI measurements, the orbital difference is less than 50 m.