Research On Cooperative Anti Deception Jamming Method For Multiple Radar Seekers

The anti-j amming capability of radar seeker is an important guarantee for the survival and penetration of radar seeker system in complex electromagnetic interference environment.Active jamming has high energy utilization rate and cost performance ratio,and it is playing an increasingly important role in radar anti-war.The angle of view of a single radar seeker is very single,and the anti-jamming capability it can achieve is relatively limited.There are limitations in active performance in the increasingly fierce electronic warfare.The development of multi-radar seeker cooperative anti-jamming technology is an important way to increase the penetration ability of radar seeker,Joint processing of the echo data of each radar seeker can effectively improve the recognition ability of the multi-radar seeker system to the active false target generated by the jammer.Under this background,this thesis has carried out the relevant research on multi-radar seeker cooperative anti-active deception jamming technology,The main work is as follows:1.The radial migration process of a single radar seeker is analyzed,the time delay equation is derived and the solution is simplified;Then,the process of processing target scene echo is analyzed,and the mathematical model of range-azimuth joint estimation of single third-order mobile radar seeker to scene target is established;Then a sidelobe suppression filtering algorithm based on linear programming is proposed and applied to the joint range-azimuth estimation results,which can effectively suppress the sidelobe level while narrowing the main lobe;Finally,the measurement data of the target is calculated by the formula,and compared with the real position,the measurement error is analyzed and corrected,and the position information extraction result of the scene target is obtained.2.Aiming at the active false target generated by jammer retransmission,a data level fusion anti-jamming method is proposed.First of all,the measurement data of all targets in the scene from each radar seeker are uploaded to the data fusion center for time alignment,and then all the measurement data are converted to the unified Cartesian coordinate system;After selecting the reference radar seeker,based on the nearest neighbor principle of Euclidean distance as the reference measure,the measurement data grouping is established to solve the combined explosion problem;The Mahalanobis distance is calculated by association of two data in the group,and the difference between the spatial correlation of the real target and the spatial non-correlation of the active false target is fully utilized to effectively identify the false target generated by the jammer retransmission.3.Two signal level active false target methods are further proposed,which make full use of the target physical information that can be extracted by the radar seeker.First,based on the scattering characteristics of the target,the echo signal from the same target irradiated by the radar seeker with different positions and different operating frequencies is derived,and the correlation sparse expression of the backscattering sparse is calculated,and the conclusion is drawn:If the observation angle of the radar seeker is significantly different from the radar operating frequency,it can be approximately considered that the scattering coefficient obtained by two types of large seekers irradiating the same target is irrelevant,while the complex envelope of the active jamming signal received by two radar seekers is relevant.Secondly,based on the target micro-Doppler characteristics,taking the multiradar seeker irradiating the ground wheeled vehicle as an example,the micro-Doppler signals generated by the strong scattering points on the wheel surface on each radar seeker are derived.According to the expression,conclusions can be drawn:The micro-motion modulation of radar seeker with different operating frequency and frequency is different when irradiating the same target from different angles.Even if the jammer consciously adds such micro-modulation between pulses,the signals in all radiation directions are the same.The difference between the real target echo and the active jamming signal in the physical sense is used to identify the active false target.