Integrated Software Design and Implementation for SDGSAT-1 Satellite Mission Planning and Command Generation

The SDGSAT-1 satellite was launched at 10:19 Beijing time on 5 November 2021, using the Long March 6 carrier rocket at the Taiyuan Satellite Launch Center in China. The satellite carries three payloads: thermal infrared, low-light and multi-spectral imagers. Through the coordinated observation of the three payloads all day, it aims to achieve a detailed portrayal of the “traces of human activities”, which will provide data support for the study of indicators that characterize the interaction between humans and nature and the monitoring, evaluation and scientific research of the realization of global sustainable development goals. This paper aims to provide an efficient mission planning and instruction generation technology for the multi-payload system of the SDGSAT-1 satellite. First, the three payloads of the SDGSAT-1 satellite are analyzed in detail to determine their power-on options in different working modes. These modes include single-payload independent operation and dual-payload combined operation to adapt to different observation needs and task priorities. In order to ensure the efficient execution of the observation task, a set of algorithms is designed to optimize the observation time of the payload. The algorithm takes into account a variety of constraints, including but not limited to: payload data rate, lighting conditions, working area, data transmission time, downlink rate, etc. Based on these constraints, an integrated mission planning and command generation system is implemented. The system can automatically generate payload control plans and data reception plans that meet the usage constraints of the satellite and its payload. Through precise mission planning, we can ensure that the observation mission of the satellite during its orbit is efficiently executed while maximizing the efficiency of payload usage. In order to further improve the efficiency of data transmission, the satellite’s data transmission process is deeply analyzed, and an innovative dual-station relay transmission mode is introduced. This mode allows satellites to transmit data between different ground stations, and effectively increases the amount of satellite data transmitted through relay, especially when the communication between the satellite and the ground station is restricted. This paper develops an efficient, flexible and reliable mission planning and command generation technology by comprehensively considering the multi-payload characteristics and multiple constraints of the SDGSAT-1 satellite. The successful implementation of this technology not only improves the efficiency of satellite data acquisition and transmission, but also provides strong data support for achieving sustainable development goals.