Design And Implementation Of Integrative Equipment For Reconnaissance And Jamming With Wideband And High Sensitivity

The modern electronic warfare receivers are facing a complex electromagnetic environment,and the target signal to be reconnaissance has the characteristics of wide frequency band,wide geographical distribution,complex signal patterns and overlapping interference noise.Therefore,reconnaissance and jamming equipments are required to meet the requirements of large instantaneous bandwidth,high receiving sensitivity and large dynamic range.In addition,in order to interfere with the target signal accurately and quickly,the receiving system should not only have the ability to process the received information quickly,but also have the ability to adapt to the environment of high-density signal,which requires better performance for the reconnaissance and jamming system.With the continuous development of integrated technology research,integrated design of reconnaissance and jamming has attracted more and more attention in the field of electronic countermeasures.However,most of the current researches are in the stage of theoretical research and system simulation.Therefore,it is of great significance to enhance the integrated engineering research of electronic countermeasures equipment.Based on the software radio architecture,this thesis develops a reconnaissance and jamming integrated equipment,which realizes the reconnaissance,jamming functions on the hardware platform of the equipment.It can also realize the fixed frequency signal,frequency hopping signal detection,modulation pattern recognition,parameter measurement and generate the required interference signal in the frequency range of 30 MHz to 500 MHz.The types of interference signals include noise frequency modulation,noise amplitude modulation and so on.The integrated reconnaissance and jamming equipment developed by the project can achieve 240 MHz instantaneous bandwidth processing and 60 dB instantaneous dynamic,so it can quickly detect and lock the target signal and generate jamming to improve the jamming efficiency.The performance of sensitivity of integrated reconnaissance and jamming equipment has been significantly improved,and the probability of intercepting small signals has been greatly improved.The integrated reconnaissance and jamming equipment can produce various kinds of jamming signals.Different jamming strategies are adopted for different target signals.The jamming methods become more flexible and diverse,which effectively improve the jamming efficiency and reduce unnecessary power loss.The project also solves the self-protection problem of reconnaissance channel when equipment works in a jamming state.In addition,the integrated design of reconnaissance and interference makes the equipment more portable and the power consumption greatly reduced.In this paper,after introducing the application field,significance and development status at home and abroad,the scheme design of integrated reconnaissance and jamming equipment is carries out,and the basic theory of the equipment,including signal sampling theory and digital down-conversion principle is analyzed.The detailed design methods of each module such as frequency conversion module,local oscillator module,sampling and signal generation module,signal splitter module and so on,are discussed,and the integrated online test and performance index test of the equipment are completed.