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18 October 2001 Environmental and target influences on microwave radiometers for landmine detection
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A simple layered medium model for microwave thermal emission from a buried object shows that multiple frequency emission measurements can potentially provide an effective means for target detection. Object detection is obtained form a search for oscillatory features in multiple frequency brightness temperatures, which occur due to interference effects between the surface and buried object interfaces. Previous studies have considered simple homogeneous temperature and water content models of the soil medium, and show that oscillatory features versus frequency are not obtained in the absence of a target even with medium temperature or soil moisture variations. However, the more realistic case of non-constant temperature and water content versus depth was not considered in previous studies; these effects can potentially modify interference phenomena. In addition, subsurface objects have typically been modeled as layers whose horizontal dimensions are infinite; models including the effects of finite targets size are thus of interest.
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Joel Tidmore Johnson, Baran U. Ungan, and David Randolph Wiggins "Environmental and target influences on microwave radiometers for landmine detection", Proc. SPIE 4394, Detection and Remediation Technologies for Mines and Minelike Targets VI, (18 October 2001);

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