Coherent versus incoherent passive radiance model

Charles J. Albers Jr.

doi:10.1117/12.277079

27 June 1997 Coherent versus incoherent passive radiance model

Charles J. Albers Jr.

Proceedings Volume 3064, Passive Millimeter-Wave Imaging Technology; (1997) https://doi.org/10.1117/12.277079
Event: AeroSense '97, 1997, Orlando, FL, United States

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.

Citation Download Citation

Charles J. Albers Jr. "Coherent versus incoherent passive radiance model", Proc. SPIE 3064, Passive Millimeter-Wave Imaging Technology, (27 June 1997); https://doi.org/10.1117/12.277079

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