Research And Implementation Of Radar Jamming Technology Based On Frequency Diverse Array

Radar jamming technology is an important part of modern warfare,Therefore,how to efficiently interfer with enemy radar system has become one of the hotspots in the current military field.Taking this as the starting point and combining with a new system of frequency diverse array(FDA)radar technology in this thesis,using the range-azimuthdependent characteristics of frequency diverse array beams,a novel frequency diverse array radar interference method is proposed.The main research work carried out is as follows:1?Based on the analysis of the characteristics of the frequency diverse array,three radar interference styles based on frequency diverse array are studied,and the mathematical expressions of the frequency diverse array jamming signals after matching filtering are deduced.The simulation results of deception interference,delay interference and slice reconstruction interference based on frequency diverse array are given,and the effectiveness of three interference patterns is verified.2?Aiming at the shortcoming that ordinary jammer not is able to generate multiple false scenes simultaneously in synthetic aperture radar imaging scene,a synthetic aperture radar jamming method based on frequency diverse array is proposed.A deception jamming model based on frequency diverse array is established,and the Range-Doppler domain imaging algorithm under the frequency diverse array deception jamming model is derived and explaining the cause of interference caused by frequency diverse array.At the same time,a false target deception interference model based on frequency diverse array is established,and a method for generating frequency diverse array false target deception jamming signals is proposed.The effectiveness of the frequency diverse array deception jamming method is verified by point target and scene imaging simulation,and the following conclusions can be obtained:· The false point target or scene in the imaging scene increases with the increase of the number of the frequency diverse array elements;· The frequency offset of the frequency diverse array can not only control the position of the false point target or scene,but also control the appearance and disappearance of the false point target or scene;· False target deception interference based on frequency diverse array can achieve“using fake instead of true”effect by modulating false scene templates;3?In order to verify the deceptive jamming effect of frequency diverse array on radar,a C-band frequency diverse array signal source was developed,and the frequency diverse array interference test platform based on USRP(Universal Software Radio Peripheral)reception was constructed.Firstly,the development process of the frequency diverse array signal source is elaborated and the test results of the signal source are given.Then,the design of the interference test platform of the frequency diverse array is discussed,and the design of the receiver is analyzed in detail.Finally,the data processing flow and the received data analysis method based on the test platform are provided,which verifies that the frequency diverse array jammer has good interference effect.