互耦效应下端射阵机载雷达空时内插STAP方法

Space-time interpolation STAP method for end-fire array airborne radar with mutual coupling effect

针对端射阵天线由于阵元间距较小,容易造成能量耦合引起互耦效应,进而影响天线增益和空域导向矢量等参数以及后续的杂波抑制性能这一问题,首先利用互阻抗法和等距离环地面散射单元积分法,建立了互耦条件下的端射阵机载雷达信号模型;然后分析了互耦效应对杂波特征谱和空域导向矢量等参数的影响;最后提出了一种基于空时内插的空时自适应处理方法,对杂波的非平稳性和空域导向矢量进行了补偿.理论分析和仿真结果证明了该方法的有效性.

Due to the small element spacing of end-fire array antenna,it is easy to cause mutual coupling effect resulting from energy coupling,which in turn affects the antenna gain,spatial steering vector and other parameters as well as subsequent clutter suppression performance.In order to solve this problem,this paper first uses the mutual impedance method and the integral method of equidistant ring ground scattering element to establish the signal model of end-fire array airborne radar under mutual coupling condition,and then analyzes the effects of mutual coupling on the parameters such as clutter characteristic spectrum and spatial steering vector.Finally,the paper proposes a space-time adaptive processing method based on space-time interpolation to compensate for the clutter nonstationary and the space steering vector.Theoretical analysis and simulation results show the effectiveness of the proposed method.