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MTI Optimization in a Multiple-Clutter Environment.
NAVAL RESEARCH LAB WASHINGTON D C
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A means of optimizing an MTI filter for rejecting several types of clutter, which is generated by different mechanisms such as by rain or the ground, is formulated. It is found that the optimal performance of such a filter depends on the spectral density functions, average radar cross sections, and the relative mean doppler frequencies of each type of clutter. It is shown that the optimal improvement factor of such a filter is bounded by the weighted average weighted in accordance with the radar cross sections of the clutter types of the improvement factor for the individual clutter type. It is also shown that the improvement factor of a filter is bounded by two limits. Both of these limits are a function of the relative mean doppler frequency f sub o between the clutter types. As f sub o increases, the performance of the MTI system degrades. The worst improvement factor occurs when f sub o is equal to half of the radar prf.
APPROVED FOR PUBLIC RELEASE