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Any two N × N costas signals must have at least one common ambiguity sidelobe if N > 3—A proof

1985
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Proceedings of the IEEE
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The initial estimate of s, and s2 is obtained by the Tufts-Kumaresan (TK) method 121, 161, 171, [Ill, that is by forward or backward linear prediction (depending on whether one is looking for falling or rising exponential components) after low-rank approximation to the observed data matrix or an estimated correlation matrix. A standard quasi-Newton method is then used for the maximization of E, 181. The performance of this method is studied by computing the bias and the standard deviation of q

doi:10.1109/proc.1985.13329
fatcat:xm3cxkj62rbutpfpiqynmdwn2i