An algorithm for calculation of angular pulse structure in an underwater sound channel is considered. The algorithm is based upon the Husimi transform that allows one to link a wavefield and the corresponding ray arrivals. An important advantage of the algorithm is the possibility of its realization with a relatively short vertical antenna. The notions of fundamental and algorithmic inaccuracies of angular spectrum measurements are introduced. The first one corresponds to fundamental limitations imposed by the uncertainty relation. The second one is related to the antenna’s ability to provide exact calculation of the Husimi transform. We estimate the minimal fundamental inaccuracy for an antenna with length of 300 m.
$^1$V.I. Il'ichev Pacific Oceanological Institute, FEB RAS
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