GPS(global positioning system) and GLONASS(global navigation satellite system) which are two kinds of real time satellite positioning systems are applied widely. In order to fit the needs of offline experiment, a GPS/GLONASS positioning emulator that based on the theory of satellite navigation was designed. This emulator analysed the movements of satellite constellation, simulated the calculation of satellite receivers, and realized satellite positioning in pure software mode. The simulative calculation results show that its accuracy is identical to that of real receiver on the whole. So the emulator can simulate real satellite positioning, and makes the simulation works convenience.
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