The new technology and on-orbit validity for GNC demonstration subsystem of CRRS

Guidance, navigation and control (GNC) demonstration subsystem is one of the three GNC subsystems of CRRS (Circumlunar Return and Reentry Spacecraft). It includes three new products, which are central control unit, micro star sensor and dustproof equipment for star sensor. And GNC demonstration subsystem is the partial products of GNC subsystem for land-ascent assembly spacecraft in the following task. To meet the demands of weight and functions in the third phase of China Lunar Exploration Program, central control unit was integrated designed based on SoPC technology to reduce the weight, and multi-layers protection was designed to fit the space radiation environment. Micro star sensor utilized aspherical Optical System and high speed processing circuit to obtain less weight. Based on micro step Motor, dustproof equipment for star sensor realized better architecture and damper design, not only satisfied the function requirement but also achieved the optimization of weight. In order to make on-orbit validity more forcefully and credibly using the CRRS, an on-orbit validity method based on "Virtual-satellite control system" was designed. This method presented an on-orbit and closed-loop test system for the above mentioned new products, without using actuator and real spacecraft. This paper mainly introduces the key technology of new products and the on-orbit validity method for GNC demonstration subsystem. Moreover, this paper makes the positive conclusion for new products according to the on-orbit validity results.