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Proceedings Paper

Coherent versus incoherent passive radiance model
Author(s): Charles J. Albers
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Paper Abstract

In the modeling of the radiance from a buried object, two principle models have been used--the incoherent model and the coherent model. The difference between these two models is in the method of combining radiation from the same source but after traversing different path lengths, due to partial reflections at the ground-air interface, to the receiver. Coherent addition of the contributions gives rise to a signal which oscillates, as a function of the burying depth, about that which would arise from incoherent addition of the contributions. The degree of coherency of the contributions is shown to be a function of the receiver bandwidth, burying depth, and surface roughness. Criteria for determining the degree of coherence are given. Experiments supporting the theory are cited and examples are given.

Paper Details

Date Published: 27 June 1997
PDF: 4 pages
Proc. SPIE 3064, Passive Millimeter-Wave Imaging Technology, (27 June 1997); doi: 10.1117/12.277079
Show Author Affiliations
Charles J. Albers, Nichols Research Corp. (United States)


Published in SPIE Proceedings Vol. 3064:
Passive Millimeter-Wave Imaging Technology
Roger M. Smith, Editor(s)

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