Research of Interferometry Baselines Between CE-4 Rover and Lunar Facility Using Halo Orbit Simulation

An orbit model for Chang'E-4 relay satellite is established which is supposed to be used in a simulation of space low-frequency radio interferometry. Based on classic Lagrange libration point L₂ Halo orbit, some parameters are calibrated and modified by the theoretical orbit of Chang'E-4 relay satellite, converting theoretical orbit to a rotation orbit in the vicinity of L₂ point through time and coordinate reference transferring. Comparisons between the Halo orbit model and the theoretical orbit model are carried out, according to which, their baselines to lunar-surface facility are calculated respectively and analyzed. In the analysis, differences between the baselines are below 60 km, which satisfy the needs of interferometry fringe searching in the HF band.