子阵级自适应差波束的方向图控制方法

The pattern control approaches of adaptive different beam at subarray level

子阵级自适应差波束的静态方向图控制在应用了单脉冲技术的相控阵雷达系统中具有重要应用。给出了子阵级自适应差波束的信号模型,分析了在无干扰的情况下,LCMV(Linearly Constrained Minimum Variance)方法的自适应方向图与静态方向图相比旁瓣电平显著增加的原因.提出了基于失配最优检测的子阵级自适应差波束的方向图控制方法。该方法通过引入失配导向向量,可使无干扰情况下的自适应方向图与静态方向图相同,从而解决了自适应与非自适应工作模式之间的转换问题;而在存在干扰的情况下,旁瓣电平与LCMV方法相比也有显著改善。该方法同时具有实现简单、不额外增加运算量的优点。仿真结果证明了其有效性。

The pattern control of adaptive different beam at subarray level finds important application in phased array radar systems which utilize monopulse technique. The signal model of adaptive different beam at subarray level is given and the reason is analyzed why in the absence of jammers the sidelobe level of adaptive pattern of LCMV method is remarkably increased compared with that of the quiescent pattern. The pattern control approach of adaptive different beam at subarray level based on mismatched optimum detection is presented. By introducing mismatched steering vector, this approach can achieve the same adaptive pattern as the quiescent pattern in the absence of jammers, as a result of which the conversion problem between the adaptive and non-adaptive working modes is solved. Simultaneously, compared with the LCMV method, the sidelobe level is remarkably improved in the presence of jammers. This approach has the advantage of easy realization and no increase of computation cost. Simulation results indicate its validity.