基于波束空间交替投影极大似然的拖曳式诱饵分辨判别方法

Towed decoy discrimination method based on beam space alternating projection-maximum likelihood

机载平台在遭遇威胁时,通过释放拖曳式诱饵假目标干扰进行自卫.载机和拖曳式诱饵在雷达波束宽度内,且径向距离小于距离分辨率时,雷达无法通过常规方法对载机目标和拖曳式诱饵进行分辨测量.针对数字相控阵雷达同拖曳式诱饵对抗的问题,提出一种基于波束空间交替投影极大似然(BSAP-ML)方法.首先通过阵元空间到波束空间处理,减少数字相控阵维度;然后通过交替投影方法对目标和拖曳式诱饵的角度进行迭代测量;最后通过基于角度向量的判别方法对载机目标和诱饵进行判断识别.仿真结果表明,该方法可用于数字相控阵雷达,对载机和拖曳式诱饵进行有效的超分辨角度测量和判别.

When the airborne platform encounters threats,it performs self-defense by releasing towed decoys for jamming.When the aircraft target and towed decoys are within the radar beam width and the radial distance is less than the range resolution,the radar cannot distinguish and measure the aircraft target and towed decoys by using conventional methods.In order to address the problem of digital phased array radar against towed decoys,a method based on beam space alternating projection-maximum likelihood(BSAP-ML)is proposed.Firstly,the dimensionality of digital phased array is reduced by processing from array space to beam space.Then the angle of the target and the towed decoy is measured iteratively by using alternating projection method.Finally,the aircraft target and decoys are identified by the discriminant method based on angle vector.The simulation results show that this method can be applied to digital phased array radar to effectively carry out super-resolution angle measurement and discrimination of the aircraft target and towed decoys.