同波束干涉测量差分相时延观测模型研究及验证

针对月球轨道交会对接地面高精度引导需求，对同波束干涉测量差分相延观测模型进行分析验证。根据甚长基线干涉测量几何时延观测量同一波前的定义，推导出同波束差分时延观测量的观测模型。并提出一种精确的同波束干涉测量差分相时延闭合算法，同时结合SELENE任务实测的数据计算差分相时延闭合值，用于对观测模型进行验证。实测数据计算结果表明，采用本文提出的精确算法显著地消除同一波前差分相时延闭合值中的趋势项，差分相时延闭合值的精度在0.5ps~1ps范围内，验证了观测模型的正确性。该研究对于后续的月球交会对接地面高精度测定轨任务分析设计将具有一定的参考价值。

Research and Verification of Differential Phase Delay Measurement Model of Same Beam Interferometry

The model of differential phase delay of same beam interferometry(SBI) is analyzed according to the requirement for the high accuracy ground based guidance and navigation of the lunar orbit rendezvous and docking mission. The differential phase delay measurement model of same beam interferometry is propagated based on the same wave front definition of very long baseline interferometry (VLBI). An accurate differential phase delay closure algorithm of same beam interferometry is derived based on the definition of the same wave front of SBI and the geometry delay closure algorithm of VLBI. The value of differential phase delay closure is calculated by using the observation data of the SELENE mission of Japan, and the result shows that the accuracy of differential phase delay closure is in the range of 0.5~1ps. The algorithm given in the paper could evidently reduce tends of differential phase delay closure, and the validity of the measurement model is verified in this paper. It is of some significance for high accuracy ground based navigation of the forthcoming lunar orbit rendezvous and docking mission.