Design and simulation of GNC system for small body impactors

Due to the quite high relatively speed when impactors approach the small body, the guidance navigation and control (GNC) system should be highly autonomous and real time capability to achieving precise impact on small bodies. Based on the common sensors and actuators in deep space mission, a GNC system was composed. Meanwhile, an autonomous optical navigation scheme and a trajectory correction maneuver guide law were proposed. Finally, strict six-freedom Monte Carlo simulations were carried out to validate feasibility and reliability of the GNC system, and the key parameters such as maneuver timing and impact aim point on impact performance were analyzed.