Real-Time Monitoring of Inter-device Distance Based on Same-Beam Interferometry

摘要

In this paper, we propose a real-time monitoring of the separation between devices by using very long baseline interferometry (VLBI) technology, which is already mature in the mission of the lunar flight. In particular, during the separation process, using the same beam interference measurement (SBI) based on two downstream signals between the detectors, and the relative delay resolution to improve the relative distance resolution. Based on the principle of monitoring the relative distance between devices by using the same beam interference measurement, the real-time monitoring algorithm is given and the effects of orbit error, observation delay error and satellite attitude error on the monitoring are analyzed. And select a reasonable number of samples and confidence intervals to determine the separation process. Simulation analysis shows that considering the influence of 10 km satellite orbit error, 10 ps observation delay error and 0.5° satellite attitude error, this method can realize the real-time monitoring of the separation between Chang'e 5's equipment.