(1) Overview
OBC (On-Board Computer) serves as a hardware platform for running satellite operation flight software, controls the satellite and collects and stores the status of the bus and payload and sends it to the ground station.
At AP Satellite Inc., we developed the OBC by designing the module by its features and building the standardized interface. This allowed us to reduce development time and cost as well as development risk so we can supply a satellite OBC that can be used for a wide range of international space projects including low-earth satellite, geostationary satellite, exploration satellite and lander.
(2) Specifications
Our On-Board Computer has the following specifications.
| Item | Specification |
|---|---|
| Processor | LEON2 Processor @ 80MHz |
| System Memory | 2 x 32kB PROM 2 x 2MB Non-Volatile Memory 2 x 2MB SRAM |
| System Interface | 2 x SpaceWire RMAP 2 x MIL-STD-1553B 2 x Internal/External CAN Bus 2 x DMAUART |
| I/O interface | Bi-level I/O Pulse & Differential Output Analog I/O AOCS Interfaces |
| Mass memory capacity | 4Gbit |
| Uplink Data Rate | 4kbps |
| Downlink Data Rate | Real-time mode: 4.096kbps Play-back mode: 1.666Mbps |
| Decryption | External Decryption Module for Uplink Tele-command with user defined algorithm |
| Weight | < 20kg |
| Size | < 350mm x 280mm x 270mm |
| Power consumption | < 80W |
| Main features | - User Configurable Hot/cold Redundancy - System Reconfiguration based on user defined software - EDAC Functions in all memories - Single Fault Tolerance Design |
AP Satellite Inc. has achieved the following development milestones:
- Next-generation Compact Advanced Satellite 500-1&2 (CAS500-1&2): development of OBC (in process)
- Next-generation small-sized Satellite No. 1 (NexSat-1): development of OBC (for core technology payloads)
