Mission Control Computer (MCC) systems on board the KITSAT-1 and KITSAT-2 satellites, launched in 1992 and in 1993, respectively, adopt EDAC (Error Detection and Correction) algorithm to detect and correct Single Event Upsets (SEUs). In addition, KITSAT-1 is boarded with a payload called CRE (Cosmic Ray Experiment) to observe high energy particles populated in the low earth orbit. We present in this thesis the results obtained from the SEU log file and CRE data. Most of SEUs are observed in the South Atlantic Anomaly (SAA) in that they are usually the multiple-bit errors. It is seen that monolithic RAMs are more susceptible to the radiation environment than the hybrid RAMs.
The High Energy Particle Detector (HEPD), which can measure the flux of protons, electrons and alpha particles in the inner Van Allen radiation belt, is designed to be on board the KOMPSAT which is scheduled for launch in 1999. The species and energies of the incident particles are determined from the energy transferred to four Surface-barrier Silicon Detectors (SSDs). Each of proton and electron energies is measured in three channels while we use only one channel for alpha particles. HEPD system is designed for the count rate not to exceed $2×10^{5}$counts/sec in the SAA. The geometrical factor of protons and electrons is 0.0287㎠-sr and that of alpha particles is 0.2285㎠-sr.
