Pointing Accuracy of Lunar-Ground Laser Communication Based on J₂ Perturbation

Abstract

Based on the J 2 orbit prediction model, lunar satellites with various inclinations and orbital heights have been designed. Then, by comparing the simulation results of the J₂ orbit prediction model with the direct integration RKF7 (8) simulation results,pointing accuracy of lunar-ground laser communication is studied. The laser communication terminal is installed on the -Y plane satellite deck in our simulation. To a certain extent,the results show that the J₂ orbit prediction model can meet the requirements of lunar polar remote sensing satellites for lunar-ground laser communication. When the orbital height is 1 000 km and 2 000 km,the azimuth deviation of 10 min does not exceed 40 μrad,and the pitch angle deviation is only about 7 μrad. The orbit prediction model can satisfy the lunar-ground laser communication pointing requirements.

Keywords

lunar-ground laser communication / J₂ orbit prediction model / deep space laser communication