title: Watermarking of linear frequency modulated pulses using chirplet graphs and stretch processing.
abstract: In many underwater acoustics problems such as search and rescue, it is desirable to establish the source of the sonar pings. In this paper a methodology is proposed to watermark sonar pulses prior to transmission by embedding them with a chain of low power chirplets represented by a graph. Watermark detection is formulated using stretch processing where chirplet energies are focused on a single beat frequency only if the graph is traversed along the same path used at the source. The algorithm is tested by simulation in shallow water at varying ranges.
authors.affiliation: Electrical and Computer Engineering Department, Villanova University, 800 Lancaster Avenue, Villanova, Pennsylvania 19085, USA bijan.mobasseri@villanova.edu.
authors.forename: Bijan G
authors.initials: BG
authors.lastname: Mobasseri
authors.affiliation: Delphi Automotive, 2151 East Lincoln Road, Kokomo, Indiana 46902, USA anirudh.nimbagal@gmail.com.
authors.forename: Anirudh
authors.initials: A
authors.lastname: Nimbagal