采用迭代快速傅里叶变化进行方向图综合，可以对大型阵列快速综合，即给定目标方向图，求权值。还可拓展到非均匀阵列-pattern synthesis using iterative FFT techniques

reference: "element failure correction for a large..." by Keizer.

For unequally spaced array please refer to:"fast pencil beam pattern synthesis of large unequally sapced antenna arrays"