Robust Capon beamforming with additional linear constraints

The robust Capon beamformer (RCB) allows for errors in the look direction array steering vector (ASV) by exploiting ASV uncertainty ellipsoids. Here, we allow for extra linear constraints, which can be used, e.g., to exploit additional prior knowledge, yielding the linearly constrained RCB (LCRCB). We show that the RCB and a modified version of the coherent RCB (CRCB), which we term MCRCB, are both special cases of the LCRCB.