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Appl. Sci. 2018, 8(8), 1329; https://doi.org/10.3390/app8081329

Feature of Echo Envelope Fluctuation and Its Application in the Discrimination of Underwater Real Echo and Synthetic Echo

1
School of Naval Architecture, Dalian University of Technology, Dalian 116024, China
2
Science and Technology on Underwater Test and Control Laboratory, Dalian 116013, China
*
Author to whom correspondence should be addressed.
Received: 3 June 2018 / Revised: 20 July 2018 / Accepted: 7 August 2018 / Published: 9 August 2018
(This article belongs to the Section Acoustics and Vibrations)
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Abstract

Discriminating a real underwater target echo from a synthetic echo is a key challenge to identifying an underwater target. The structure of an echo envelope contains information which closely relates to the physical parameters of the underwater target, and the characterization and extraction of echo features are problematic issues for active sonar target classification. In this study, firstly, the high-frequency envelope fluctuation of a complex underwater target echo was analyzed, the envelope fluctuation was characterized by the envelope fluctuation intensity, and a characterization model was established. The features of a benchmark model echo were extracted and analyzed by theoretical simulation and sea testing of a scaled model, and the result shows that the envelope fluctuation intensity varies with carrier frequency and azimuth of incident signal, but the echo envelope fluctuation of the synthetic target echo does not present these features. Then, based on the characteristics of echo envelope fluctuation, a novel method was developed for active sonar discrimination of a real underwater target echo from the synthetic echo. Through a sea experiment, the real target echo and synthetic echo were classified by their different echo envelope fluctuations, and the feasibility of the method was verified. View Full-Text
Keywords: active sonar; underwater; envelope; envelope fluctuation intensity; synthetic echo; echo discrimination active sonar; underwater; envelope; envelope fluctuation intensity; synthetic echo; echo discrimination
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Chen, Y.; Li, S.; Jia, B.; Li, G.; Wang, Z. Feature of Echo Envelope Fluctuation and Its Application in the Discrimination of Underwater Real Echo and Synthetic Echo. Appl. Sci. 2018, 8, 1329.

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