NDLI: Predicting L-band Microwave Attenuation through Forest Canopy using Directional Structuring Elements and Airborne Lidar

Content Provider	IEEE Xplore Digital Library
Author	Wright, W.C. Liu, P.W. Slatton, K.C. Shrestha, R.L. Carter, W.E. Lee, H.
Copyright Year	2008
Description	Author affiliation: Dept. of Civil & Coastal Eng., Univ. of Florida, Gainesville, FL (Wright, W.C.; Liu, P.W.; Slatton, K.C.; Shrestha, R.L.; Carter, W.E.) \|\| Dept. of Electr. & Comput. Eng., Univ. of Florida, Gainesville, FL (Lee, H.)
Abstract	The L-band signals broadcast by GPS satellites are attenuated by vegetation, making it problematic, if not impossible, to predict the performance of the system in forested areas without some quantitative measure of the structure and density of the local forest canopy. Airborne laser swath mapping (ALSM) observations can be used to rapidly and remotely sample the structure and density of forested areas. We report here the results of a study performed to determine the attenuation of GPS signals in forests, by correlating changes in the signal-to-noise ratio (SNR) of the received GPS signals under different canopies, using three dimensional structure and density information about each canopy derived from ALSM observations. The results of this study verify that the loss of signal is strongly correlated with the local structure and density of the forest, and we demonstrate how the ALSM point cloud can be used to better predict the attenuation of the GPS signals. The results of this research also pertain to other modes of microwave transmission in forested areas, including satellite and cellular telephony, and the estimation of biomass from L-band radar.
File Size	259955
File Format	PDF
ISBN	9781424428076
DOI	10.1109/IGARSS.2008.4779441
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-07-07
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	L-band Laser radar Global Positioning System Satellite broadcasting Vegetation mapping Area measurement Density measurement Attenuation measurement Optical attenuators Signal to noise ratio forestry Lidar GPS biomass radar
Content Type	Text
Resource Type	Article

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