Modeling And Simulation Of Deep Space Communication Channel For Mars Mission

With the rapid advancement of science and technology,the field of deep space exploration has gradually opened its own mysterious veil,and a number of countries have began to develop the aerospace field.At present,China's space activities are in a critical period of development to Mars.The design and implementation of the Mars deep space exploration channel communication simulation system play a very important role in the Mars exploration.In this thesis,the parameters analysis and simulation of Mars deep space channel are performed.The overall channel is divided into three parts: interstellar space segment,Mars near ground segment and Mars surface segment,and the influencing factors of the three segments are analyzed in details.The interstellar space segment mainly analyzes the effects of free space propagation loss,solar flicker,Doppler shift and planetary noise.The Martian near-field analysis mainly affects the Martian atmosphere,Mars sandstorm and the Martian cloud layer;the Martian surface segment mainly analyzes the obstacles.The effects of diffraction loss are single obstacles and multiple obstacle scenes,and the ray tracing method is used to compare the results.Modeling and analyzing the three-segment channel provides theoretical supports for the channel parameter estimation module in the simulation system.Then the index performance requirements and functional requirements of the simulation system are given.A set of channel parameter modeling analysis and calculation functions in the Mars deep space channel environment is completed.Then,the software simulation system is modularized and implemented.They are the parameter configuration module,the parameter estimation module,the visualization module,the hardware driver and the program control module,etc.,and the detailed functions of these modules are explained and introduced,and the work is given.Finally,the hardware and software joint debugging of the Mars deep space exploration channel communication simulation system is carried out.The results show that the whole software system works well with the underlying hardware.It can simulate the Mars deep space detection channel according to the channel parameters input by the user and give real-time surround.The three-dimensional image of the orbit of the device,all indicators meet the design requirements,laying a solid foundation for the future development of the Mars detection system.