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I' 17. DISTRIBUTION STATEMENT (of the Abstract en~tered In Block 20. It different ftr.m Report) T~' SJustification__ I&. SUPPLEMENTARY NOTES f tr uc Di stribution/ AvaIlnbtitv Codes I....lland/or I9. KEY WORDS (Continue on rveree eld. I nececey end IdentIfy by block nu.,be,) 1 "t!..Pe jal Adaptive arrays Tracking I Antennas Digital processing A Nonlinear processing,/i, Spectral analysis I.1 1comr 20. ACT (Continue on,ecro. olde if neceeetv n1d Identify by block number)- d'-- ' Modern spectral-estimation techniques have achieved a level of performance that attracts interest in applications areas such as the tracking of multiple spatial sources. In addition to the original "superresolution " capability, these techniques offer an apparent "absence of sidelobes&quot