NDLI: L-Band Radar Estimation of Forest Attenuation for Active/Passive Soil Moisture Inversion

Content Provider	IEEE Xplore Digital Library
Author	Kurum, M. Lang, R.H. O'Neill, P.E. Joseph, A.T. Jackson, T.J. Cosh, M.H.
Copyright Year	1980
Abstract	In the radiometric sensing of soil moisture through a forest canopy, knowledge of canopy attenuation is required. Active sensors have the potential of providing this information since the backscatter signals are more sensitive to forest structure. In this paper, a new radar technique is presented for estimating canopy attenuation. The technique employs details found in a transient solution where the canopy (volume-scattering) and the tree-ground (double-interaction) effects appear at different times in the return signal. The influence that these effects have on the expected time-domain response of a forest stand is characterized through numerical simulations. A coherent forest scattering model, based on a Monte Carlo simulation, is developed to calculate the transient response from distributed scatterers over a rough surface. The forest transient-response model for linear copolarized cases is validated with the microwave deciduous tree data acquired by the Combined Radar/Radiometer (ComRAD) system. The attenuation algorithm is applicable when the forest height is sufficient to separate the components of the radar backscatter transient response. The frequency correlation functions of double-interaction and volume-scattering returns are normalized after being separated in the time domain. This ratio simply provides a physically based system of equations with reduced parameterizations for the forest canopy. Finally, the technique is used with ComRAD L-band stepped-frequency data to evaluate its performance under various physical conditions.
Sponsorship	IEEE Geoscience and Remote Sensing Society IEEE URSI
Starting Page	3026
Ending Page	3040
Page Count	15
File Size	839513
File Format	PDF
ISSN	01962892
Volume Number	47
Issue Number	9
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-09-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	L-band Passive radar Attenuation Soil moisture Microwave radiometry Backscatter Radar scattering Transient response Time domain analysis Numerical simulation vegetation frequency correlation function (FCF) microwave transient response soil moisture
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Electrical and Electronic Engineering

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