title: Relative velocity measurement from the spectral phase of a match-filtered linear frequency modulated pulse.
abstract: Linear frequency modulated signals are commonly used to perform underwater acoustic measurements since they can achieve high signal-to-noise ratios with relatively low source levels. However, such signals present a drawback if the source or receiver or target is moving. The Doppler effect affects signal amplitude, delay, and resolution. To perform a correct match filtering that includes the Doppler shift requires prior knowledge of the relative velocity. In this paper, the relative velocity is extracted directly from the Doppler cross-power spectrum. More precisely, the quadratic coefficient of the Doppler cross-power-spectrum phase is proportional to the relative velocity. The proposed method achieves velocity estimates that compare favorably with Global Positioning System ground truth and the ambiguity method.
authors: Laboratório de Vibração e Acústica, Universidade Federal de Santa Catarina, Floriaónopolis, Brazil samuelpinson@yahoo.fr.
authors: Samuel
authors: S
authors: Pinson
authors: Applied Research Laboratory, The Pennsylvania State University, State College, Pennsylvania 16804, USA cwh10@psu.edu.
authors: Charles W
authors: CW
authors: Holland