Satellite Communication Simulation System Based On Ka Band

Nowadays,personal mobile communication and information superhighway have become the representative of the information age.In order to meet the social needs of information diversity,communication technology is increasingly required.Due to the technical advantages of satellite communications with wide coverage,long communication distances,flexible deployment stations,fast operation,and costs that are not limited by communication distances and multi-site broadcasting characteristics,It has been widely used in radio and television,broadband multimedia communications,personal mobile communications,emergency communications and military communications.Compared with the traditional Ku-band,the Ka-band satellite bandwidth capacity has increased tenfold,the unit flow cost has been greatly reduced,and it can better meet the transmission requirements of applications,such as high-definition video,real-time live broadcasting,and online games.Therefore,Ka-band satellite communications will become the future development direction of high-throughput bandwidth.Based on the design of Ka-band satellite communication simulation system,the following work is accomplished:(1)The simulation software required for system design is introduced,the design of the transponder is taken as the focus,and the basic composition and characteristics of the transponder are analyzed.Determine the overall performance parameters of the transponder,and the parameters of the D/C module,BDCA module(intermediate frequency signal to baseband signal),BUCA module(baseband signal to intermediate frequency signal)and U/C module.According to the requirement,use System Vue simulation software to design each frequency conversion module,and then simulation verifies the performance of each module of the transponder and the overall performance of the transponder.According to the verification results,the transponder meets the system design requirements.In this paper,the phase array receiving antenna is added to the satellite communication link.The experimental results show that the phase,gain,and noise coefficient of the phased array have an impact on the signal received and forwarded by the relay star.Also,the antenna has achieved jump and coverage with high gain in a wide range.(2)Analyze and design the satellite communication link and build a simulation link.Based on this,an interference model is added to the uplink.This model is used to verify the anti-interference performance of the system.Among them,the interference type is divided into pulse interference and single frequency interference,and the interference power is changed by adjusting the pulse width of the pulse signal and the power of the single frequency signal.Then,the BER simulation of the system is carried out.The BER software or BER test module is used to explore the relationship between interference and system performance,phased array and system performance.The results show that different types and sizes of interference have different effects on system work.(3)In order to facilitate user visualization operation,the GUI joint simulation platform is designed with Matlab simulation software.Through this platform,parameters in the link can be set up more intuitively,the operation of the control simulation system can be observed,and the simulation results can be observed.Finally,summary the design of the system,put forward the shortcomings in the design,and outlook the future work.The system can provide reference for the design of the follow-up Ka-band communication satellite.