Research On Ionospheric Sounding Radar Based On Software Dedined Radio Technology

The ionosphere is an important part of the earth's space environment.Ionosphere has various effects on space activities,communications,satellite navigation and other activities.After years of unremitting efforts,ionospheric observation technology and equipment in China have made a series of significant progress.The ionospheric altimetry radar,also known as the ionospheric Grohe,is still one of the most important and widely used ground ionospheric detection equipment since its birth at the beginning of the last century.However,the traditional ionospheric altimetry radar is usually realized in pure hardware,and its volume and weight are large,and its maintenance,function adjustment and upgrading are more complex.Software radio technology has been applied and developed in the field of communication because of its general and open advantages.Therefore,the purpose of this paper is to apply the software radio technology to the study of ionospheric detection in view of the detection requirements of the ionosphere,and to realize a set of ionospheric software radar detection system by using the characteristics of the openness,generality and reconfiguration of the software radio technology.The system has a small,upgrades and maintenance system.With the advantages of low,high flexibility and low power consumption,in addition to this,this radar system was used to test the ionosphere over Nanchang and to write signal processing program.From the echo signal of the radar,the vertical distribution profile of the ionosphere electron density over Nanchang was successfully extracted.The main research work and achievements in this paper are as follows:1.This paper summarizes the development of the ionosphere and its detection methods and main technologies,lists the main equipment of the present stage of ionosphere detection and summarizes the advantages and disadvantages of the current ionospheric detection equipment,expounds the software radio technology and points out its development direction for the next generation of ionospheric detection equipment.2,based on software radio technology,this paper proposes and implements a Doppler radar system.By combining the software radio technology and the Doppler principle,the Doppler radar can effectively detect the speed and distance of the moving object.Compared with the existing Doppler radar,it has the advantages of low cost,small size and easy to upgrade the function.In the mobile target detection experiment,the radar has achieved relatively accurate results,and has high real-time performance and strong practical value.3.On the basis of Doppler radar,a set of ionospheric detection radar system is designed and implemented in combination with the software radio technology,the ionosphere detection technology and the ionosphere data processing algorithm.Compared with the existing ionospheric detection radar,the radar system is versatile,scalable,and significantly reduces volume and power consumption.The reliability of the radar is verified by two closed loop experiments.In the open loop experiment,the radar has obtained the data.From the results of processing,the radar can detect the parameters of the ionosphere accurately,and the detection performance is excellent.It is of great significance to the next step of the satellite ionospheric detection equipment.This paper makes a summary of the ionospheric detection technology and the ionospheric detection radar equipment.In view of the shortage of equipment at present,a new type of ionospheric detection radar based on software radio technology is designed and implemented in this paper.From the detection results,the radar is overcoming the size of the original equipment and maintaining it.On the basis of high power consumption and high power consumption,it has achieved good detection results.It has good theoretical and practical significance.It validates the design theory of the “satellite borne radio plasma detection system” for major instruments of the National Natural Science Fund and provides some technical verification and testing platform for the project.