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 from 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 target size are thus of interest. In this paper, multiple frequency emission results from a layered medium with non-constant temperature and water content versus depth axe examined in the target and no target cases. Thermal and water content profiles are obtained from models for water and thermal transport, so that reasonable variations with depth are included. Results are shown which indicate that the basic target detection methodology is not strongly influenced by these factors at microwave frequencies. Numerical models for computing emission from a finite size buried object are also presented, and results compared with those from the layered medium theories to quantify the influence of target size relative to the observed region on emission results. Again, results show that the basic detection methodology can remain valid even with finite target sizes.


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    Title :

    Environmental and target influences on microwave radiometers for landmine detection


    Contributors:
    Johnson, J.T. (author) / Ungan, B.U. (author) / Wiggins, D.R. (author)


    Publication date :

    2001


    Size :

    9 Seiten, 14 Quellen




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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