Research On Anti-deception-jamming Processing Methods Of Airborne Multistatic SAR

Synthetic aperture radar(SAR)is one of the main means of ground reconnaissance.However,the transmitter and the receiver of traditional monostatic SAR are fixed on the same carrier,which is vulnerable to electromagnetic interference.Therefore,the improvement of anti-jamming ability of SAR has become a research hotspot.Compared with the monostatic SAR,the rich target scattering information can be obtained by multistatic SAR.It has the advantages of strong concealment,and provides more possibilities for anti-jamming research,which has become the international frontier of SAR anti-jamming technology research.This dissertation focuses on the key technologies for anti-deception jamming of multistatic SAR,including multistatic SAR echo model,jamming identification and localization,jamming suppression and elimination.The main research contents are as follows.1.In the jamming signal environment,the quantitative model of multistatic SAR echo and deception jamming echo with respect to system parameters and configuration parameters is established,respectively.The characteristic differences of false targets in the same receicer and different receivers are analyzed,which lays the theoretical foundation for the follow-up research on the false target identification and jammer localization methods.2.The anti-deception jamming method of multistatic SAR based on range discrimination is proposed.The information of real targets and false targets are obtained.And the false target identification is effectively realized by the maximum stable extreme value detection and range cross discrimination method.According to the corresponding relationship between the false target and the jammer in the image domain and the space-time domain,the jammer is accurately located.And then the multistatic image information optimization fusion method is adopted to effectively suppress the single source single time-delay deception jamming.3.An anti-deception jamming method based on pairing decoupling for multistatic SAR is proposed.According to identification results of false targets,the corresponding relations between false targets and jammers are analysed,using the pairing decoupling of multiple false targets and jammers,combined with the jamming suppression method based on beamforming,the effective suppression of multi sources and multi time-delay deception jamming is realized,and the image information is supplemented to the greatest extent.4.A multistatic cooperative adaptive configuration transformation anti-deception jamming method is proposed.The jammers are located by characteristic of false targets.According to the dependence between false targets and the configuration of multistatic SAR platform,the anti-jamming problem of multistatic SAR is modeled as a multi-target optimization problem of multistatic SAR configuration.By changing the configuration,the false target is removed from the imaging area,so as to eliminate the jamming.The effectiveness of the above models and methods has been verified in the simulation experiment.The research results show that the method proposed in this dissertation can effectively identify and eliminate false targets in many cases,reconstruct SAR images without jamming signal,and improve the anti-jamming performance of multistatic SAR.