SIRIUS OBC LEON3FT DEVELOPMENT KIT

Sirius OBC Kit DataSheet Product enquiry

Smallsat Onboard Computer Development Kit

Designed for advanced satellite constellations in LEO and deep space exploration missions the readily available SmallSat SIRIUS OBC LEON3FT DEVELOPMENT KIT delivers ‘always-on’ reliable operations that work every time, on time, with precision performance.

With enhanced error detection and correction, the Sirius onboard computer is tolerant to Single-Event Effects (SEE) in logic and data storage. 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. The development kit is powered through a mains 12V adaptor, eliminating the need for specialised power supplies or other laboratory equipment.

Sirius spacecraft avionics are modular in design. Modules can be combined to offer redundant configurations, or to simply accommodate mission specific requirements.

The Sirius Command and Data Handling System has a standard single string system that consists of an on-board computer (Sirius OBC) and a combined mass memory with CCSDC stack (Sirius TMC). The OBC runs mission specific software and manages the spacecraft system. The TMC receives and stores payload data and platform housekeeping while at the same time distributing telecommands and serving mass memory data to the transceiver.

We offer various software design kits for this product, including BAL (Bright Ascension Ltd).

Performance

With 50 MHz LEON3F fault-tolerant soft processor, its RTEMS real-time operating system (RTOS) is compliant to IEEE 1754 SPARCv8. Utilizing SpaceWire on-board the main data bus, the on-board computer is designed to emphasis high performance, resilience and reliability.

Reliability 

The development kit includes a Sirius on-board computer with a RTEMS real-time operating system running on a FPGA based soft processor. This combination results in an outstanding on-board computer with high performance, resilience and reliability.

Adaptability

Easy-to-use interfaces, facilitating the development phase and reducing overall development and project costs. With the ability to unplug the OBC unit and test it on a flat sat environment the Sirius OBC kit is designed for desktop use with flight software environments.

Why SIRIUS-OBC-LEON3FT Development Kit?

  • TRL 9
  • EM: 3 months, FM: 6 months
  • Flown since 2021
  • Designed for advanced satellite constellations in LEO and deep space exploration missions
  • Reliable high-performance space data handling avionics
  • Tolerant to Single-Event-Effects (SEE) in logic and data storage
  • RTEMS real-time operating system (RTOS)
  • Multiple on-board data buses
  • Designed for five years in LEO
  • ITAR free equipment
  • Modular, compatible, mechanical design

Technical Specifications

General
Design Life 5 years in LEO
Processor 32-bit LEON3FT (IEEE-1754 SPARC v8) fault-tolerant processor
Processor Clock 50 MHz
SCET 15.25 μs accuracy
SDRAM 64 MB (post-EDAC)
Instruction Cache 8 kB
Data Cache 8 kB
NVRAM 16 kB (post-EDAC)
Operating Temperature +10°C to +30°C
Boot Image Storage 2 GB (post-EDAC)
Power Supply Input 9V to 15V using power supply; 12V wall socket plug included
Interfaces
SpaceWire 50 Mbps; RMAP support 2
Serial Ports RS422 / RS485 UARTs 6
Serial Ports RS485-only UARTs 2
PSS Interface RS485 PPS input / output 2/1
Analog Input Buffered 24 bit; up to 31250 SPS 8
GPIO* 3.3 V logic 16
Debugging JTAG port for CPU OpenOCD (real-time debug interface) with debug UART 1
CAN Implemented on optional daughter board 2
SpaceWire Implemented on daughter board 2
Dimensions
Length 230 mm
Width 155 mm
Height 37 mm

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