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A Physical Model-Based Analysis of Heterogeneous Environments Using Sonar-ENDURA Method
May 1994 (vol. 16 no. 5)
pp. 497-506

A physical model-based analysis of unstructured environments is presented using sonar as a sensing device. Previous methods have relied only on time-of-flight (TOF) methods and have examined only homogenous environments consisting of either smooth or rough surfaces. In this paper, a forward model for the reflection from a class of surfaces with varying degrees of roughness is presented based on the Kirchhoff approximation method. This model integrates different types of environments into a single analytical framework. The echo intensity is parametrized in terms of its energy content and duration, which are functions of the surface roughness, distance, and orientation. The echo-energy and echo-duration maps are introduced to display these parameters. A systematic and robust procedure (ENDURA method) is presented to analyze the reflections and to differentiate and localize the reflecting surfaces. The methodology is verified with experimental results obtained in our laboratory. The results indicate a significant improvement over conventional TOF systems.

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Index Terms:
acoustic signal processing; sonar; physical model-based analysis; heterogeneous environments; sonar; ENDURA method; unstructured environments; time-of-flight methods; Kirchhoff approximation method; echo intensity parametrization; energy content; energy duration; surface roughness; distance; orientation; echo-energy maps; echo-duration maps
Ö. Bozma, R. Kuc, "A Physical Model-Based Analysis of Heterogeneous Environments Using Sonar-ENDURA Method," IEEE Transactions on Pattern Analysis and Machine Intelligence, vol. 16, no. 5, pp. 497-506, May 1994, doi:10.1109/34.291448
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