Chapter 1 Reduced-rank intelligent signal processing with application to radar

The technologies associated with radar signal processing have developed and advanced at a tremendous rate over the past sixty years. This evolution is driven by the desire to detect more stealthy targets in increasingly challenging noise environments. Two fundamental requirements on signal processing have developed as advanced radar systems strive to achieve these detection goals: 1) The dimensionality of the signal space is increased in order to nd subspaces in which the targets can be discriminated from the noise; and 2) The bandwidth of each of these dimensions is increased to provide the degrees of freedom and resolution that are needed to accomplish this discrimination when the competing noise and the target are in close proximity. To be more precise, radar has developed from having only a spatial dimension to the utilization of a Doppler frequency (or slow-time) dimension to combat monostatic clutter, to a signal frequency (or fast-time) dimension to defeat terrain scattered interference, to

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