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• W1139543050 abstract "According to the acoustical Doppler effect, an improved narrow-band technique is proposed to estimate underwater source’s motion parameters including speed, closest distance, rest frequency, and closest point of approach (CPA) time, by using a single receiving sensor. First, the matched Wigner transform (MWT), which produces a time–frequency distribution (TFD) with optimal energy concentration and without inner artifacts for a high-order polynomial phase signal, is defined. On the basis of the MWT, a method is developed for the accurate instantaneous frequency (IF) estimation of Doppler signal. Moreover, we deduce that the Wigner–Ville distribution of the Doppler signal has a peak at the center of the TFD. Thereafter, the CPA time is directly estimated. When the CPA time is obtained, the other motion parameters can be easily estimated by using a simplified amplitude weighted nonlinear least-squares method, which fits the IF estimates to the predicted Doppler shift. Finally, the effectiveness of the proposed scheme is validated by using underwater acoustic data." @default.
• W1139543050 created "2016-06-24" @default.
• W1139543050 creator A5032675774 @default.
• W1139543050 creator A5052383569 @default.
• W1139543050 date "2016-01-01" @default.
• W1139543050 modified "2023-10-14" @default.
• W1139543050 title "Parameter estimation of underwater moving sources by using matched Wigner transform" @default.
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• W1139543050 doi "https://doi.org/10.1016/j.apacoust.2015.07.020" @default.
• W1139543050 hasPublicationYear "2016" @default.
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