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Two mixed-integration processors for processing coherent imaging radar data are analyzed and compared. These two optical processors reduce the deleterious speckle effects associated with a fully coherent imaging system. However, the mixed-integration process reduces the achievable resolution. The discrete frequency-plane mixed-integration processor subdivides the frequency plane into M × N cells, processes each cell coherently, and incoherently sums the individual outputs. The scanning frequency plane mixed-integration processor continuously scans the frequency plane with an aperture that is 1/M × 1/N times the size of the signal spectrum. It is shown that the scanning processor is much more effective at reducing the effects of speckle while achieving comparable resolution.
J. S. Zelenka (Mon,) studied this question.
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