The Research Of The Satellite Data Distribution Signal Simulation Platform Based On SOC

LEO occupies an extremely important role in the construction of a satellite communication system,the data distribution LEO satellite is the most important one,so if you can use a small,high-performance platform to simulate the satellite data distribution signal.It will become very meaningful,not only to provide a simulation environment for satellite data distribution system,but also to provide a realistic signal source for the satellite payload testing and receiver testing.In this paper,the research of the satellite data distribution signal simulation platform based on SOC has been studied in the following areas:Firstly,in view of the features of satellite data distributed signal,high dynamic,low delay,Doppler frequency and short visible time,determining the use of ?ZYNQ core board and FMC sub card ? to simulate the data distribution satellite signal,the model of the ZYNQ core board is selected as ZYNQ7045,the FMC sub card is selected as AD9361.The design idea of AD9361 and ZYNQ is proposed.Secondly,determining the software running on SOC is embedded Linux and building a good software development,operating environment for embedded systems;the size of the system software is configured,cut,compiled from 2GB to 10 MB,the system is still running stable and responsing rapidly;Thirdly,using the embedded GTK+ language and glade application software to design the visual interface of the satellite data distribution signal simulation,the simulation of the satellite orbit parameters,the receiver signal Doppler,the signal transmission path loss,the simulation results are consistent with the STK software.Fourthly,the environment of the AD9361 is setting up and the signal transmitting and receiving is realized in the network terminal controlling AD9361,the quality of the transmitted and received signals is evaluated.Test results showed that the accuracy of sending and receiving signals is high,when the frequency of the transmitted signal is about 800 MHz,the signal is transmitted to the best quality and the quality of the received signal is the best when the frequency of the received signal is about 5500 MHz.In this paper,the simulation system of the satellite data distribution platform has achieved good results,which has a certain practical value.