Design of on Board X-Band Data Transmission System of SVOM Mission

The SVOM (Space-based multi-band astronomical Variable Objects Monitor) is an international cooperation project lead by CNSA (Chinese National Space Agency) and CNES(Centre National d'Etudes Spatiales, France), which focuses on the detection of GRB (Gamma-Ray Burst). X-band system is the data transmission channel for SVOM science data. In corporation with both the Chinese and French x-band ground stations, on board x-band system sends the science data of different payloads to the scientists according to the arrangement of downloading plan. In this paper, on board x-band system design and board to ground interface is elaborated. The validation and measurement of the board to ground interface proves the effectiveness of on board system design.