The Research Of Doopler Frequency Shift Interference In Electronic Countermeasure Of Sensor Nets

In the modern military warfare, electronic warfare technology is playing an increasingly important role. The technology of electronic jamming is one of the most major part of electronic countermeasure. This paper that has the background of National Defense Basic Scientific Research Project which is subsidized by National Defense Science Technology Industry Committee and Ministry of Education, focus on the study of electronic jamming based on Wireless sensor networks.This paper is divided into three major parts: Radar jamming system components, Research of Doppler frequency shift jamming signal,and the analysis of the Doppler frequency shift jamming effect.(1) Radar jamming system components:which introduced the distributed electronic warfare integrated combat system block diagram, a major component of the jamming system structure. Wireless sensor networks composed of jamming nodes and frequency measurement nodes, Research and design of the nodes to achieve the function, which showed block diagram and signal processing flow chart. Finally, processor module, communication module and memory module of the sensor node is designed. The system uses small detection nodes, because of its small size, having a good hidden,can widely distribute, and work together, different location nodes can multi-faceted collecti enemy's electromagnetic information, can be quickly integrated the enemy radar operating frequency, pulse pressure, coding, conversion, scanning, operating parameters, to complete the whole space electromagnetic signals reconnaissance and to achieve the effective jamming.(2) The research of Doppler frequency interference: Based on the weakness of mechanism of blanket jamming and deception jamming. A kind of Doppler frequency interference which has the advantages of those jamming mentioned above is presented in this paper, It plays a complementary effect of blanket and deception jamming. After that, the paper studies the digital model of Doppler frequency interference and velocity and range jamming caused by frequency shift.At last ,in order to generate some powerful Doppler frequency shift signals which have the features of velocity and deception ,frequency shift needed by system is Modulated to radar signal, These signals generated by DDS. Technology can smoothly pass through enemy's radar signal processing system, thus it is capable of generating many false target .(3) The analysis of doppler frequency interference's effect : This part gives the framework of whole system and the excogitation of each parts. After that this parper simulate the process of radar exploration by Matlab GUI, so that the whole process can be watch intuitively via visual interface. We can get the dynamic process of radar detection and detected targets in the interface. At last the analysis of SIR interference effect has been taken, we get the conclusion that transmitting Doppler frequency interference need to meet a certain energy relationship, so that enemy radar system can be effectively suppressed and get deception jamming.