Abstract
The frequency invariability of the warped modal signal and the warped signal autocorrelation function in shallow water is discussed. A method is proposed for passive source-range estimation based on the frequency invariability and warping transform of signal autocorrelation function received by a single hydrophone in a range-independent or weak range-dependent shallow water environment. In the method, a guided source with a known range is employed to provide the crucial and relative invariant scaled features. The experimental data in shallow water with an iso-speed profile and a fluctuated thermocline are used to verify this approach. The relative errors of the source range estimation are basically less than 10%.
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