Research On Reconnaissance Analysis Technology Of UAV Radiated Signal Based On Software Radio

In recent years,commercial UAV applications have been successful,but this has also created insecurities.In order to monitor and manage the UAV target,this paper focuses on the research and analysis of the radiation signal detection and analysis technology of the UAV baesd on software radio.Firstly,this paper discusses and studies the research progress in various related fields in detail,and guides the design research of the subsequent functional modules.Second,analyze and clarify project needs.Based on the project requirements,the hardware is divided into functional modules such as data acquisition,real-time spectrum analysis and dual-channel cache,and the implementation principles of each functional module are introduced in detail.At the same time,according to the project requirements,the overall design plan is given.After that,this paper designs and implements the divided functional modules.Then,this paper introduces the characteristics of UAV radiation signal,the principle of reconnaissance based on spectral features and the principle of passive direction finding algorithm,and designs and implements the algorithm.Finally,the system is actually tested to verify the effects of software control functions and algorithms,and to analyze the causes of errors.This paper focuses on the design and implementation of the software radio hardware platform based on AD9361.After verification,the platform has certain versatility,and has the characteristics of low volume power consumption and high cost performance.At the same time,a high-speed dual-channel real-time cache module based on DDR4 is designed and implemented.The module has the characteristics of large bandwidth and dual channel independent cache.Based on the hardware structure,this paper proposes a signal recognition algorithm based on frequency domain features for UAV radiation source,which can effectively identify the communication signal of COFDM modulation mode.The work done in this paper finally realizes the function modules,and the real-time rendering of the interface is completed.After the data is processed by the reconnaissance and direction finding algorithm,the UAV radiation signal can be identified and the orientation of the UAV can be finally measured.