Abstract:

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.

Key words: Lunar orbit rendezvous and docking, Same beam interferometry, Measurement model, Differential phase delay closure