ÅAC Microtec has developed Sirius OBC with LEON3FT enables a new reliable high-performance on-board computer specialized on advanced nanosatellite 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. The on-board computer is designed to emphasis high performance, resilience and reliability.

Main Features

  • 50 MHz LEON3FT soft processor
  • Reliable high-performance space data handling avionics
  • Tolerant to Single-Event-Effects (SEE) in logic and data storage
  • RTEMS real-time operating system (RTOS)
  • SpaceWire on-board data bus
  • 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 OBC with LEON3FT enables advanced nanosatellite constellations in LEO and deep space exploration missions due to its focus on high reliability, resilience and performance. Fault tolerance is secured through  TMR  (Triple-Modular  Redundancy)  on  all FPGA flip-flops and through boot flash and EDAC (error detection  and  correction)  on   memories.   Sirius   OBC is tolerant to Single-Event-Effects (SEE) in logic/data storage and the equipment is ITAR free.

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.


Download product sheet

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.