Inversion for a sphere’s geometrical, elastic, position, and radial-motion parameters in a waveguide


  1. Fawcett, J.A.
Corporate Authors
Defence R&D Canada - Atlantic, Dartmouth NS (CAN)
The broadband scattering characteristics of a target may be used to distinguish its echos from those of clutter. This type of classification is of interest in many sonar applications: ASW, torpedo, mines, and diver detection. In a shallow water situation, the original sonar pulse and the echo from the target will consist of a sequence of pulses corresponding to the various combinations of incident and backscattered multipath arrivals. Thus, the interference effects of the waveguide propagation can have a significant effect upon the received echo and thus also affect the classification of the target from the echo. In addition, the target may be moving, in which case the received echo is Doppler-shifted. The purpose of this report is to investigate the simultaneous determination of a spherical target's position (range and depth) within a waveguide, its radial speed, its radius, its shell thickness, and the elastic parameters of the shell. It will be shown that many of these parameters can be accurately estimated from a single wideband echo. The expected uncertainties of the parameter estimates will also be investigated.

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Radar clutter;Sonar echoes;Pulses
Report Number
DRDC-ATLANTIC-TM-2010-029 — Technical Memorandum
Date of publication
01 May 2010
Number of Pages
Electronic Document(PDF)

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