Sonar Echo Ranging Using Signals With Nonlinear Time-Frequency Characteristics

Antonia Papandreou-Suppappola, Seth B. Suppappola

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


In this letter, we investigate the applicability of cetacean sounds and frequency-modulated (FM) signals with dispersive characteristics toward the problem of echo ranging of acoustic targets. We derive closed-form expressions of the ambiguity function range resolution profile for nonlinear FM (NFM) pulses with similar time-frequency characteristics as cetacean whistles. We demonstrate that by varying the signal parameters, we can obtain their ambiguity function with a narrow mainlobe and low sidelobes desirable for estimating the time delay and Doppler shift of the received echo. We further test our results by formulating a detection problem using NFM pulses.

Original languageEnglish (US)
Pages (from-to)393-396
Number of pages4
JournalIEEE Signal Processing Letters
Issue number3
StatePublished - Mar 2004


  • Ambiguity function
  • Sonar echo ranging
  • Time-varying (TV) signals

ASJC Scopus subject areas

  • Signal Processing
  • Electrical and Electronic Engineering
  • Applied Mathematics


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