The SIRIUS TCM LEON3FT from AAC Clyde Space is a Satellite On-Board Computer (OBC) with a real-time operating system that runs on a 32-bit LEON3FT fault-tolerant processor. This command and data handling system consists of an onboard computer (Sirius OBC) and a combined mass memory with a CCSDS stack (Sirius TCM). It has a processor clock of 50 MHz and a SCET of 15.25 us accuracy. The OBC has an SDRAM of 64 MB (post-EDAC), a nonvolatile system memory NAND flash of 2 GB (post-EDAC), and a mass memory storage capacity of 32 GB. It utilizes the SpaceWire interface for high bandwidth and on-board data transfer and CCSDS encoding standards for satellite link services. This OBC requires a power supply of 4.5-16 V and has a power consumption of 1.3 W. It has a mass of 130 g and measures 95.89 x 90.17 x 17.20 mm (L x W x H). The OBC is designed and qualified for five years of operation in low-earth orbit and is ideal for advanced satellite missions.
