Source localization for the matched-mode processing by a short vertical array

The matched-mode processing is an important method of source localization and detection for a distant underwater target. In this paper, a fast iterative method of mode decomposition for a short vertical array is presented. It has very fast convergent speed. By the matched-mode processing with the iterated mode amplitude vector, the accuracy of source range and depth estimation are obviously raised, and the sidelobes are effectively suppressed.This method is used to reduce the length requirement of array and it has potential application prospects. With the simulated calculation of the Pekeris model and the Arctic Ocean channel,we prov that the new method of mode decomposition is reasonable and effective. The experiment of source localization for a short vertical array has been successfully performed from a Qingdao site, the Yellow Sea in December of 1993.