OBDH (On-Board Data Handling System) Core for the ESEO micro-satellite is being developed with the use of PC/104 industrial computer equipped with Pentium processor.

OBDH Core controls data flow on board the spacecraft as well as data flow between GS (Ground Station) and spacecraft itself using the radio connection provided by COMM (telecommand and telemetry packets are means of communication). As a result of that, OBDH allows GS to monitor and control the operations of ESEO. However, OBDH Core is autonomous to some degree. When there’s no GS coverage OBDH Core shall execute the scheduled operations and monitor the key parameters. OBDH Core shall take all reasonable steps to minimize the consequences of detected errors.

Software is running on Linux with 2.6.9 kernel and Real-Time Application Interface patch. It is being written in C++ mostly. Small parts are writeen in C.

OBDH Core, together with Attitute and Orbit Control System (delivered by students from Portugal) computer, is closed within alluminium box. OBDH Core consists of threeindustrial PC/104 boards. First one is a PC computer board. Second is so called auxiliary board. Its main function is to communicate with on-board devices using two CAN buses. It is a custom made board by SKIK students. Third board is a voltage converter board.