Internal charging has been pointed as the reason of many satellite anomalies. In this paper, thecalculating principle of internal charging effect was introduced. ATICS, A software tool which cansimulate internal charging effect of satellite in space, was presented. A calculating example ofATICS for FR-4 printed circuit board in common use in satellite was provided. The electrontransport in FR-4 PCB of satellite was carried out based on open source code GEANT4 which is atoolkit for the simulation of the passage of particles through matter. After that, the build-up electricfield was calculated by fundamental physical principles. Considering the planar FR-4 PCB withdifferent thickness and several mono-energy electrons beams (0.5MeV-3MeV), we obtained the fluxdistribution with PCB depth, the charge deposit and the energy deposit, etc. Consequently, using thedifferent grounding mode, build-up electric fields in FR-4 PCB were calculated. The result showsthat in the case of perpendicular incidence, electrons lost their most energy at the half-path. Theresult of build-up electric field calculation indicates that maximum electric field, which mainlydetermined by depositing electrons and charge leakage rate, always increases with the thickness ofdielectric board.
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