Multiple-frequency adaptive antenna processing over imperfect ground planes

This paper illustrates a method to carry out adaptive processing simultaneously at multiple frequencies using the same antenna array located over imperfect ground planes. First, it is shown how to transform an array situated over an imperfect ground to a uniformly spaced array of point radiators. Then, a direct data domain least squares (D3LS) method is used to extract the signal-of-interest (SOI) in the presence of jammer and clutter simultaneously at multiple frequencies, using a single snap shot of the data.