SIRIUS-OBC-LEON3FT

Sirius OBC DataSheet Product enquiry

SmallSat Onboard Computer

Flight proven across multiple mission applications for a range of customer requirements, this readily available SmallSat Sirius-OBC-LEON3FT solution has a reputation for reliability and performance for advanced satellite missions.

Dependable data handling designed for advanced satellite constellations in LEO and deep space exploration missions the readily available SmallSat Sirius-OBC-LEON3FT delivers ‘always on’ reliable operations that work every time on time with precision performance.

Our on-board computer is designed to emphasis high performance, resilience and reliability. Designed for the most demanding missions the Sirius OBC provides modular, satellite compatible, mechanical design. With pulse commands for low level, basic commanding. Sirius TCM spacecraft avionics are modular in design, modules can be combined to offer redundant configurations or to simply accommodate mission specific requirements. Our inbuilt protections are based on over a decade of design heritage guarantee real-time-on-time operations.

With enhanced error detection and correction, the Sirius OBC is tolerant to Single-EventEffects (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 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 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.

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

Performance

With 50 MHz LEON3FT 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 

Sirius OBC solutions have autonomous single event latch-up protection in logic and data storage. Our inbuilt protections are based on over a decade of design heritage guarantee realtime-on-time operations. Designed and qualified for five years in LEO.

Modularity

Designed for the most demanding missions the Sirius OBC provides modular, satellite compatible, mechanical design. With pulse commands for low level, basic commanding.

 

Why SIRIUS-OBC-LEON3FT?

  • 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
Expected 5 years in LEO
Processor 32-bit LEON3FT (IEEE01754 SPARC v8) fault-tolerant processor
FPU IEEE-754 single/double precision FPU
Processor Clock 50MHz
SCET 15.25µs accuracy
SDRAM 64MB (post-EDAC)
Instruction Cache 8kB
Data Cache 8kB
NVRAM 16 kB (post-EDAC)
Operating Temperating Range -30°C to +60°C
Nonvolatile System Memory Nand Flash 2 GB (post-EDAC)
Power Supply Input 4.5V to 16V
Radiation (TiD) 20kRAD (qualified > 30kRAD; Si)
Interfaces 
SpaceWire 50Mbps 2
Serial Ports RS422/ RS485 UARTs 6
Serial Post RS485-only UARTs 2
PSS Interface RS485 PPS input / output 1/1
Analog Input Buffered 24; bit up to 31250 SPS 8
GPIO 3.3 V logic 16
CAN Implemented on optional daughter board 2
SpaceWire Implemented on daughter board 2
Size; Weight & Power
Nominal Power Consumption 1.3W
Mass 130g
Length 95.89mm
Width 90.17mm
Height 17.20mm
Height - Optional daughter board 12.50mm

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