Watermarking of linear frequency modulated pulses using chirplet graphs and stretch processing

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.

from #Audiology via xlomafota13 on Inoreader http://ift.tt/1OJ3ahH
via IFTTT