A design method of data traffic satellite system has been developed. Firstly through band-pass sample theorem

the simulation system sample rate has been designed and furthermore the lowest equivalent carrier wave formula was deduced

the deduced formula is able to be applied into other simulation system. At the same time

the equivalent design methods to the practical system time and frequency spectrum were presented. Secondly according to the system function structure

the system software frame and running threads was studied. Finally corresponding function models has been realized. Two work modes including independent running and network controlling were provided

functional models

which were required by the transmitter and receiver of data-traffic satellite system and including radio modulation

were simulated integrally. Based on the evaluation model

the frequency spectrum

eye pattern and relation of BER and SNR are presented

and the simulation results are in agreement with theoretical values.