Flexible Robust Adaptive Beamforming Method With Null Widening

The nonstationarity of interferences and array errors may bring fatal degradation to the interference cancellation performance an adaptive beamformer. Covariance matrix tapering (CMT) can produce wide troughs in receiving pattern becomes a promising solution. However, not only full adaption methods but also robust sidelobe canceller widen all nulls symmetrically original directions arrival (DOAs) with same width. In fact, most cases, does need symmetrical equivalent-width since it is little possibility that different poses nonstationarity. To cover worst nonstationarity, traditional CMT widest null will suffer waste degrees freedom (DOFs). this paper, flexible method for widening proposed which desired width asymmetry. asymmetry developed from spatial asymmetrical cluster, unequal produced by disturbing space matrix. Computer simulation result corroborate feasibility merits method.