The norm constraint IQML beamforming algorithm for wideband and coherent jammers suppression

In this paper, a new narrowband beamformer with derivative constraint is developed for wideband and coherent jammers suppression. The so-called IQML algorithm used to estimate the unknown directions of the jammers in signal-free environment is known to be an inappropriate constraint estimator. In this paper, a new IQML algorithm with a norm constraint is a consistent estimator and can achieve better performance. We show that it outperforms the approach with linear constraint used in the narrowband beamformer, in terms of flat s, output SINR and ing capability for wideband and coherent jammers suppression.