DESIGN AND APPLICATION OF ANGULAR MOMENTUM MANAGEMENT STRATEGY FOR CHANG’E-4 RELAY SATELLITE

The angular momentum unloading of the Chang'e-4 relay satellite during the halo orbit will perturb the orbital configuration. The effect of active attitude adjustment and unloading of the momentum wheel of the Chang'e-4 relay satellite on the maintenance of the mission's orbital configuration is studied, and a management strategy for the angular momentum of the relay satellite is designed. Based on the modeling of angular momentum change rate and the short-term telemetry data, a method of angular momentum change prediction based on differential correction is proposed. The calculation method of attitude adjustment unloading of relay satellite and the verification method of whether unloading occurs during attitude rotation are given. According to the different conditions of Chang'e-4 lander and rover in the lunar day, the attitude adjustment and attitude adjustment unloading strategies of the relay satellite are given. The engineering application shows that the error of the prediction method of relay satellite angular momentum change is small. The attitude adjustment and unloading according to the angular momentum management strategy can reduce the orbit maintenance frequency. The strategy is effective and feasible.