Robust adaptive beamforming for wide-band, moving, and coherent jammers via uniform linear arrays

The problem of providing robustness to the conventional narrow-band uniform linear array configuration so as to handle aide-band and moving jammers is addressed here. This robustness is achieved via the use of derivative cons traints in jammer directions. However, since the jammer directions are not known a priori, these constraints are incorporated with a maximum likelihoo d characterization of the so-called jammer subspace, This formulation does not need to assume the availability of signal-free observations, as stipula ted in earlier work. Computer simulation results are presented, which show that the algorithms proposed here yield significantly better performance as compared to the previous algorithms of Gershman et al. [1], [2] and Hung a nd Turner [3] in a variety of situations required to handle wide-band, movi ng, and coherent jammers.