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Electric hardware system design for the Space Solar Telescope

The Space Solar Telescope (SST) is being researched, developed and manufactured by National Astronomical Observatories, Chinese Academy of Sciences (NAOC) in China. It is designed for further solar physics research. There are five payloads with different observation modes on SST, including a Main Optical Telescope (MOT) with 1-meter diameter. Two of five payloads have simple and one-dimension data format, while the others are CCD imaging telescopes. There are 16 CCDs with different resolutions on SST. The total data amount is about 50GB per day. So, onboard electric hardware system is very complex. The whole system is divided into three levels. The top level is for the spacecraft housekeeping, including attitude, thermal, power, and TC/TM etc. control units. The middle level is to manage the five payloads. And the bottom level includes the Scientific Data Processing Unit (SDPU), which will be used to process the original data. 1553B bus and RS-422 bus will take the responsibility for transmitting information between the three levels. The electric hardware system should satisfy the demands of different observation modes and different data formats. In this paper, the hardware system design methods are discussed in detail.