相位控制形成阵列零陷的技术

针对传统零陷技术计算大量的问题,提出了一种不同于传统相位控制方法的相位控制形成零陷的新方法,它是一个无约束极值优化问题.首先提出一个干扰抑制比概念,并构造一个非线性代价函数,然后利用最速下降法,通过最小化该代价函数,求取线阵阵元最优的相位扰动值,从而能够在多个干扰源方向形成零陷.仿真结果表明,采用提出的零陷形成技术,能够在多个干扰源方向形成深度零陷而不影响主瓣.该相位控制形成零陷的技术突破了传统的相位控制技术要求零陷个数必须远小于阵元数的限制.

Method of null steering by phase control

A new technique different from conventional phase-only algorithm for the pattern synthesis of linear antenna array is proposed.A novel concept of interference suppression ratio was presented to construct a nonlinear cost function,and the optimum resolution for pattern nulling was derived from minimizing the cost function by employing steepest descent method.The simulation results show that the proposed method can steer several nulls agreeable to nulls depth in the beam pattern in the directions of strong interference signals without affecting the main beam.And it overcomes the limitation existed in previous phase-only techniques that the number of nulls must be small compared to the number of elements.