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Proceedings Paper

Measured and simulated power spectral density and temporal coherence of infrared cirrus and stratus cloud images
Author(s): Morton S. Farber; Jerry Alan Tessendorf; Albert Soong
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Paper Abstract

Sets of image data from the MUSIC (Multi Spectral Infrared Camera) have been analyzed to obtain the spatial and temporal structure of cirrus and stratus cloud scenes at small spatial and temporal scales. The MUSIC data were collected in 1989 in a side-looking airborne geometry. The large clutter to noise ratios found in this analysis for both cirrus and stratus clouds represent a potentially large noise source for IRST. The power-law roll-off and anisotropy of the power spectral density of images is compared to the output of a 3-D cloud scene simulator and found to be in reasonable agreement; and in very poor agreement with simpler notions which invoke perspective distortion of two-dimensional clouds and predict much large anisotropy. The log of the time-lagged coherence of a registered sequence of images depends on the square of the spatial frequency and the square of the time lag. This is in agreement with a passive advection model of the cloud evolution, which successfully predicts the change in coherence behavior between smaller and large time lags relative to the advection integral time.

Paper Details

Date Published: 13 August 1993
PDF: 19 pages
Proc. SPIE 1967, Characterization, Propagation, and Simulation of Sources and Backgrounds III, (13 August 1993); doi: 10.1117/12.151077
Show Author Affiliations
Morton S. Farber, Arete Associates (United States)
Jerry Alan Tessendorf, Arete Associates (United States)
Albert Soong, Arete Associates (United States)


Published in SPIE Proceedings Vol. 1967:
Characterization, Propagation, and Simulation of Sources and Backgrounds III
Wendell R. Watkins; Dieter Clement, Editor(s)

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