Automatic Dependent Surveillance Broadcast (ADS-B) reception via satellite is surveillance technique that used to provide information from aircraft. Reception via satellite is intended to expand the coverage of ADS-B terrestrial. Thus, Iridium and Globalstar with the altitudes of 800 km and 1400 km respectively is utilized for comparisons. Altitude of the satellite affect the radius that is used to calculate the density of the aircraft that the satellite can coverage. The simulation result show that the footprint radius of Iridium satellite and Globalstar is 836.6 NM (Nautical Miles) and 1083 NM respectively which means the higher the altitude, the coverage also increase. On the other hand the optimum pulse duration of the ADS-B signal is 50 μs for Globalstar satellite and 120 μs for Iridium satellite. Consequently shorter pulse duration of ADS-B signal results in less message that can be transmitted.