一种基于二次约束的零陷加宽算法

An algorithm for null widening under quadratic constraint

本文提出了一种基于二次约束的零陷加宽有效算法。该方法在Capon波束形成器的基础上,通过对干扰积分矩阵进行二次方约束和优化选取约束参数的方法控制零陷的深度和宽度;采用拉格朗日乘子法解决了二次方优化问题,精确计算了影响算法性能的拉格朗日乘子的取值范围,从而达到抑制运动干扰的目的。仿真结果验证了该方法的有效性,与现有的算法相比,在旁瓣抑制和输出信干噪比方面有一定优势。

A novel algorithm for null widening under quadratic constraint is presented in this paper. Under the quadratic constraint on the interference integration matrix, the method can control the depth and width of null with different parameters based on the Capon beamforming criteria. The analytic solution of this quadratic programming problem is given by Lagrange multiplier methodology, and then the scope of Lagrange multiplier value which affects the algorithm performance is precisely computed, so the goal for moving interference suppression is attained. Simulation results show the effectiveness of the proposed algorithm, and it has advantages over the existing algorithms in sidelobe control and output SINR.