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The problem of helicopter parameter estimation and blade number selection is addressed. The parameters are estimated based on Maximum Likelihood methods and the corresponding Cramér–Rao bounds are derived. To avoid ambiguities in blade number estimation, we apply information theoretic criteria for blade number selection incorporating alternate penalty functions. We assume that a clutter filter essentially...
Using the concept of the coarray, an expression is derived for the point spread function for wide-band pulse-echo imaging arrays. The performance of imaging arrays under near- and far-range conditions is analyzed, focusing on linear imaging using line arrays. The results are also extended to the case of planar arrays. The results provide a better understanding of the interplay between bandwidth, element...
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