用投影预变换提高自适应波束形成的稳健性

Robust Adaptive Beamforming Via Projection Pretransformation

在快拍数较少和（或）存在系统误差时，自适应波束形成的性能会变差，特别是会引起方向图副瓣电平升高——波束畸变。本文提出的投影变换法利用干扰方向的初略估计，在未精确预知阵列流形的条件下，可以显著改善自适应方向图的副瓣性能，并提高自适应算法的收敛性，计算机仿真结果验证了这一优点。

Small number of samples and (or) system errors result in bad performance of adaptive beamforming,especially in adapted antenna patterns with high sidelobes——beam distortion A projection transformation method is presented in this paper,which utilizes preliminary estimation of interference DOA It is demonstrated that the sidelobe perfomance of abapted antenna patterns can be significently improved with this method and increased convergence rate of adaptive algorithm when the array manifold is not known exactly,which is confirmed by computer simulations