Research On Confronting Deception Jamming Techniques In Distributed Multi-static Radars

In modern warfare,electronic jamming technique has been developed from the simple noise suppression jamming into the deception jamming that has sorts of types,with the emergence of digital radio frequency memory(DRFM).And with the wide application of the deception jamming,there has been a great threat to radar survival in battlefield.Since distributed multi-static radar system can constitute a omnibearing,threedimensional and multi-layered combat structure and have the advantages of multiple systems,multiple overlapped factors and covering full frequency band,it can mitigate the influence of the electronic jamming for the strategic purpose of protecting valuable military facilities.Therefore,it has been a research hotspot in the field of electronic countermeasure(ECM)to confront deception jamming in distributed multi-static radar system.Focusing on the problem of countering deception jamming in distributed multi-static radar system,this paper carries out the research from two aspects: data domain antijamming and signal domain anti-jamming.The specific works of this thesis include:1.The working process and the jamming mechanism based on DRFM are studied.The mathematic models of five typical jamming are given and the process of its implementation are illustrated specifically.With the simulation results,these jamming influence on radar system is analyzed in detail.2.In the view of multiple targets tracking techniques in mono-static radar network,the system model of multiple targets tracking is established and the methods of data association,data fusion,track initialization,track association of different kind,Kalman filtering and track management are analyzed in detail.Finally,the multiple targets track method has been demonstrated by the simulation result.3.Considering that the range deception jamming is common in target tracking,the corresponding jamming measurement model is established from the aspect of data domain.And the feature of target homology in radar network is also analyzed,based on which the discrimination method of deception jamming measurement is studied.Finally,the anti-jamming performance are verified through the simulation results.4.From the aspect of data domain,the multi-static radar system model under range deception jamming is established and the jamming suppression method based on range-angle information is proposed,in which the processing procedures are illustrated in detail.Through the simulation results,it is demonstrated that the proposed method can suppress the range deception jamming effectively and realize the localization of multiple targets precisely.5.From the aspect of signal domain,the deception jamming discrimination method base on the difference of target spatial scattering characteristics are studied.After constituting the target echo model and the deception jamming model,the correlation difference between real and false targets is analyzed in detail,on the basis of which the specific method to counter deception jamming is illustrated.Finally,the effectiveness of the anti-jamming method is validated through simulation results.6.Considering the condition that SNR is low,the number of pulse is fewer and the number of false target is more,the performance of the discrimination method based on the spatial scattering difference will deteriorate severely.The difference between real and false targets in the dimensions of amplitude,Doppler and range is analyzed,on the basis of which a suppression method is proposed to counter range-velocity compound deception jamming.Through the simulation results,it is demonstrated that the problem above can be resolved effectively by our proposed method.