Research On High Resolution Radar Interference Countermeasure And Target Recognition

Ballistic missiles can strike enemy targets accurately at a great distance,which is a major threat to military defense.Target recognition is an important stage in intercepting missiles.Since the missile flies outside the atmosphere for most of the time,the missile's flight receives little impact from atmospheric resistance,and during this time the missile's engine turns off,the missile receives almost zero thrust.At this time,the missile is only subjected by the gravitational of the earth and performs inertial motion.In order to maintain stability,the warhead is generally in a precession state or a nutation state.Therefore,the middle stage of the ballistics is an important stage for intercepting ballistic missiles.However,in the middle of the ballistics,the missile will gradually separate some structures that are no longer needed,such as missile fragments and springs.In order to increase the probability of the warhead breaking through the defense system,the missile will release the fake target such as the bait during the flight.The target group formed by all the spatial target sets will make the spatial target more complex.At the same time,all targets are considered to be only affected by the gravitational pull of the Earth.Reduce the discriminability between the warhead and the bait,and improve the difficulty of identifying the true target and the bait during the mid-flying period.First of all,this paper introduces three methods of target recognition.The first is to introduce the relationship between RCS time series and the relationship between RCS time series and attitude angle.The CAUTOC-CAMDF method is used to extract the RCS sequence period and the matching fitting method is used to obtain the precession angle of the space target.This method is suitable for baits that are similar in quality to the warhead but have different quality distributions.Secondly,it analyzes the precession,swing,nutation state of the space target and the transformation matrix of various states.The echo is obtained by the high-resolution radar and analyzed by time-frequency to obtain the echo micro-Doppler feature of space target.This method is suitable for identifying targets and baits with different fretting states.The last method of target recognition is based on the target HRRP.Extract the length of the target projected in the radar line of sight to identify warheads and baits of different sizesAfter introducing the analysis and comparison of the three target recognition algorithms,this paper introduces suppressed interference and the influence of suppressive interference on echo micro-Doppler and HRRP.Describe the flow of adaptive sidelobe cancellation and the influence of aslc on suppressive interference.