中文摘要：

同波束VLBI通过同时观测两个探测器的多点频信号,可以得到两个探测器之间高精度的差分相位时延,日本月球探测计划SELENE充分体现了这一技术在月球探测器精密定轨中的贡献。本文针对采样返回的月球探测任务中,轨道器和返回器同时绕月飞行期间,研究利用同波束VLBI跟踪数据在探测器精密定轨和月球重力场仿真解算中的贡献。结果表明,加入同波束VLBI跟踪数据之后,探测器定轨精度有显著提高,改进超过一个量级。综合同波束VLBI跟踪数据解算得到的重力场模型相比于传统的USB双程测距测速数据,中低阶次位系数精度有明显改进,并且定轨精度有望能达到米级。

英文摘要：

High accuracy differenced phase delay can be obtained by simultaneously observing multi point frequencies signal of two spacecraft with same beam VLBI technique.Its contribution to lunar spacecraft precise orbit determination is embodied in Japanese lunar exploration mission SELENE.Considering that there will be orbiter and return capsule flying around the Moon during the lunar return mission,the contribution of the same beam VLBI to spacecraft precise orbit determination and lunar gravity field solution are investigated.The results show that the accuracy of precise orbit determination can be improved more than one order of magnitude after incorporating the same beam VLBI measurement.There is significantly higher accuracy of low and medium degree coefficients of the lunar gravity field model obtained from combination of USB two-way range and range rate and the same beam VLBI measurement than that one from USB data only,and the accuracy of precise orbit determination may reach meter level.