What are Satellite On-Board Computers (OBC)?

Satellite On-Board Computers (OBC) are the central processing units of spacecraft, responsible for executing flight software, managing subsystem coordination, handling telemetry and telecommand operations, and maintaining overall mission logic. The OBC interfaces with payload instruments, communication systems, power management units, and attitude control subsystems to ensure synchronized and deterministic operation. Architecturally, an OBC integrates processing cores, memory resources, communication interfaces, and fault management mechanisms within a radiation-tolerant hardware platform designed for autonomous operation.

Engineered for operation in harsh space environments, OBCs incorporate radiation mitigation techniques, watchdog systems, redundancy strategies, and robust power conditioning to ensure reliability under total ionizing dose exposure and single-event effects. They execute real-time control algorithms, health monitoring routines, and mission sequencing tasks while maintaining strict timing and power constraints. As the command and data handling backbone of a spacecraft, Satellite On-Board Computers must balance computational capability, electrical efficiency, and environmental resilience.

Key specifications of the Satellite On-Board Computers:

• Satellite Type: Satellite type defines the class of spacecraft for which the OBC is intended, such as scientific, communication, Earth observation, or technology demonstration platforms. Different satellite classes impose distinct processing, redundancy, and interface requirements. The selected OBC must align with mission complexity, autonomy level, and subsystem integration scope associated with the satellite category.
• Orbit: Orbit specifies the operational environment in terms of radiation exposure, thermal cycling frequency, and communication latency conditions. The orbital regime directly influences radiation hardening requirements, fault tolerance architecture, and shielding considerations for the OBC. Selection must ensure reliable operation across the anticipated mission duration and environmental stresses.
• Mass: Mass represents the physical weight of the OBC unit. In spacecraft design, mass contributes to overall launch constraints and structural integration planning. The OBC must meet mission mass budgets while maintaining mechanical robustness and structural integrity under launch loads and in-orbit conditions.
• Voltage: Voltage defines the required supply levels for OBC operation, including core logic and peripheral domains. This parameter determines compatibility with the spacecraft power distribution bus and influences regulation, filtering, and protection circuitry design. Stable voltage operation is critical for maintaining processor reliability and data integrity.
• Current: Current specifies the electrical current drawn during operation. It directly impacts power subsystem sizing, harness design, and thermal management planning. Understanding current consumption under different operational modes is essential for accurate spacecraft power budgeting.
• Power Consumption: Power consumption defines the total electrical power required during nominal and peak processing conditions. This parameter affects solar array sizing, battery capacity planning, and thermal control strategy. Efficient power consumption enhances mission longevity and subsystem reliability.
• Interface: Interface specifies the communication protocols and physical connectivity options supported by the OBC. These interfaces enable integration with payloads, sensors, actuators, and communication transceivers. Proper interface selection ensures interoperability, deterministic data exchange, and compliance with spacecraft bus architecture.
• Radiation Tolerance: Radiation tolerance characterizes the OBC’s ability to withstand total ionizing dose and single-event effects without functional degradation. This specification is fundamental to mission assurance, dictating the level of hardening, redundancy, and error mitigation techniques required to maintain operational continuity.
• Altitude Stabilization Component: Altitude stabilization component refers to the attitude determination and control subsystems interfaced with or managed by the OBC, such as sensors and actuators responsible for orientation control. The OBC must support precise timing, feedback processing, and control loop execution to maintain spacecraft stability and pointing accuracy.
• Interface: Interface defines the specific data exchange pathways used for subsystem coordination and external communication. Multiple interface configurations may be supported to enable redundancy, high-speed data transfer, or fault-tolerant networking within the spacecraft architecture. Interface capability directly influences integration flexibility and system scalability.

The Largest Database of Satellite On-Board Computers (OBC)

SatNow has listed Satellite On-Board Computers (OBC) from the leading manufacturers and made them searchable by specification. You can enter the key parameters and the search tool will scan catalogs from the leading manufacturers to identify products that meet your spec. Once you find Satellite On-Board Computers (OBC) that meet your requirement, you can view product information, download datasheets or request quotations. Quotation requests will be routed to the manufacturer of the product who will get back to you directly. The quotation will also be routed to distributors of the product in your region.