Scientific Research Journal Vol.10 No. 2, 2013 ISSN 1675-7009 © 2013 Universiti Teknologi MARA (UiTM) Malaysia Error Detection and Correction System (EDAC) of On Board Data Handling (OBDH) in Real Time Operating System Behaviour Haryono¹, Agfianto Eko Putra², Jazi Eko Istiyanto² and Agus Harjoko² Satellite Centre¹, National Institute of Aeronautics and Space ( LAPAN), Jl Satelit KM 04 Rancabungur Bogor Department of Computer Science, Faculty of Mathematics and Natural Sciences², Gadjah Mada University (UGM), Sekip Utara Kotak Pos 21 Bulaksumur Yogkayakarta ¹Email: haryono@hryn.net ABSTRACT The satellite requires the support of a robust sub system. On Board Data Handling (OBDH) is the core function of the satellite subsystem and has to be error free in managing the operation of the satellite. It should withstand the harsh environmental conditions in space that has a lot of hazards caused by radiations. In view of these two conditions, the OBDH design should be able to manage the operation and overcome the hazards of radiation. In order to manage the operation Real Time Operating System (RTOS) was applied. RTOS was able to manage the task efficiently and effectively. In the aerospace domain, RTOS has become popular because of its strength in managing the operating system. Error Detection and Correction System (EDAC) system was applied to make OBDH more robust. This paper will discuss the implementation of the EDAC system in tandem with the RTOS behaviour to manage the operation and increase the robustness of the system. The findings show that OBDH can be programmed successfully using RTOS to handle critical and robust operations. Keywords: EDAC, uCos, Real Time Operating System, SH7145, OBDH