Design and validation of onboard observation management software in SMU of svom satellite

SVOM is a space mission in cooperation between China and France. SVOM stands for “Space multi-band astronomical Variable Objects Monitor”. SVOM mission aims at detecting GRB (Gamma Ray Burst) through a collection of instruments in various gamma and X energy bands as well as in visible wave lengths through a narrow field of view telescope. Satellite management unit is an important onboard device of SVOM satellite and it’s responsible for implementation of the sophisticated onboard observation management which handles general program, GRB and targetof-opportunity observation. Because GRB would be automatically generated on-board, a sound mechanism to decide to accept or reject is necessary. Then, some work of predictions about satellite capacity is needed. These requirements place high demands on autonomy of onboard satellite management. Besides, other pre-planned observations and target-ofopportunity observations uploaded by ground station need to be processed simultaneously with a complicated logic. When an observation is finished, the previously interrupted observation may be recovered at specific time. Further, unpredictable satellite attitude increase difficulty in ground planning such as X-band visibility. This results in X-band visibility algorithm to be implemented by satellite management unit. Face these complex requirements, a reasonable interface design is important to reduce coupling. The interface is clear and the design is easy to maintain and flexible to possible new requirements. Through several operational tests which include typical scenario, the design is verified to meet the requirements of onboard observation management.