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A target-tracking concept based on modern spectral estimation techniques combined with adaptive array processing has been investigated to attain superresolution tracking performance. The goal is to achieve satisfactory monopulse track angle estimates in the presence of strong multiple interference sources which are located within a beamwidth of the target. This application area was addressed via an all-digital receive system concept whereby adaptive spatial filter weights are periodically updated on the basis of source estimates, and the filter output residue signals are then sifted for targets. This report includes several radar-simulation examples to illustrate some of the processing step outputs, tracking beam distortions, corrections for target wavefront distortions, and tracking in the presence of closely spaced interference sources. It also contains a section devoted to the algorithm theory, analysis, and development which will help to understand the various processing steps involved. (Author)