Abstract: ‍ ‍The detection performance of the traditional radar system，which is widely used at present，has reached a very high level.However，due to the outstanding problems such as closed system architecture，binding of function to hardware，and tight coupling of hardware and software，it has caused a series of problems such as complex equipment spectrum，single function solidification，maintenance support，and upgrading and improvement difficulties，and long development cycle，large resource consumption，and slow application of new technologies，it is difficult to adapt to rapidly changing military needs and rapid technological development.New technological systems must be developed to solve these problems.Aiming at the main problems existing in traditional radar，this paper focuses on the development and application requirements of software defined radar，and systematically analyzes the main characteristics of the software defined radar such as openness，flexibility and agility. The concept and realization requirements of openness， flexibility and agility are given，and the essential characteristics and performance advantages of the software defined radar are revealed by comparing the software defined radar with the traditional radar.On this basis，the general idea of developing software defined radar technical system analysis is put forward，the realization requirements of software defined radar technology are systematically analyzed from the aspects of software defined radar system architecture，front-end，processing platform，software environment and application software development.It is pointed out that the modular open system architecture based on hierarchical model is the top requirement of software defined radar design，and is the important foundation and soul of realizing the openness，flexibility and agility of software defined radar system.It is necessary to break the shackles of traditional radar front-end design ideas，fully open front-end resources，rationally divide functional modules，and realize the decoupling and componentization of modules. On the basis of traditional radar back-end，we must adopt integration framework and middleware technology to realize software and hardware platform decoupling and architecture scalability.The application software must be designed in a componentized manner and focus on improving component reusability.According to the analysis results，it is clearly proposed that open system architecture，hierarchical system design，modular function division，component software design and software and hardware decoupling are the essential characteristics and core contents of the software defined radar technology system，the basic requirement is to follow the relevant standard specifications of software defined radar，so as to provide guidance for the application of software defined radar technology and the development of equipment.The software defined radar technology system is different from the traditional radar technology system.This technology system is a new technology system produced by changing the traditional radar design method and research and development mode，starting from improving the openness，flexibility and agility of the radar system.Its core content is open system architecture，hierarchical system design，modular function division，componentized software development，software and hardware decoupling and other technologies.These technologies determine the openness，flexibility and agility of the software defined radar that the traditional radar does not have，and give the software defined radar new capabilities based on the performance of the traditional radar.And this capability has become more and more important，and its importance even exceeds the traditional radar performance to some extent，becoming the goal of the development of a new generation of radar.Therefore，it is of great significance to develop software defined radar technology system.