ÅAC Microtec has developed Sirius TCM with LEON3FT that enables a new reliable high-performance mass memory specialized on advanced nanosatellite and microsatellite missions. Its real-time operating system runs on a LEON3FT fault-tolerant soft processor, is compliant to IEEE 1754 SPARC v8, and emphases on enhanced error detection and correction. Fault tolerance is secured by using triple-modular redundancy on FPGA and memory scrubbing.

Main Features

  • Reliable high-performance space data handling avionics
  • Tolerant to Single-Event-Effects (SEE) in logic and data storage
  • RTEMS real-time operating system (RTOS)
  • 50 MHz LEON3FT soft processor
  • SpaceWire on-board data bus
  • S- and X-band transceiver interface
  • 32 GB mass storage capacity
  • CCSDS satellite link services
  • Designed and qualified for five years in LEO
  • ITAR free equipment
  • Modular, nanosatellite compatible, mechanical design
  • Pulse commands for low level, basic commanding


The Sirius TCM implements SpaceWire for the main on-board data bus for high bandwidth on-board data transfer. The transceiver interface of the unit implements the CCSDS encoding standards for satellite link services for compatibility with leading ground stations networks. The Sirius TCM is supplied with a user-friendly application software for management of on-board services which makes it ready for integration out of the box or with a board support package for custom software development.

Modular Design

The   Sirius   products   are   designed   for   modularity.   A standard single string system consists of an on-board computer (Sirius OBC) and a combined mass memory with CCSDS stack (Sirius TCM). The OBC runs mission specific software and manage the spacecraft system. The TCM receives and stores payload data and platform housekeeping data while at the same time distributing telecommands and serving mass memory data to the transceiver. A Sirius data handling system is easily adapted for additional capacity and redundancy by adding modules.


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Flight heritage

We are very proud of our flight heritage since we flew our avionics on the first mission back in 2009. Many successful flights have followed since then and many new are scheduled.