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Remote estimation of dielectric permittivity of lunar surface regolith using compact polarimetric synthetic aperture radar data

DSpace at IIT Bombay

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Title Remote estimation of dielectric permittivity of lunar surface regolith using compact polarimetric synthetic aperture radar data
 
Creator BHATTACHARYA, A
PORWAL, A
DHINGRA, S
DE, S
VENKATARAMAN, G
 
Subject ELECTRICAL PROPERTIES
WATER ICE
MOON
ABUNDANCE
CHANDRAYAAN-1
DEPENDENCE
SPECTRA
POLES
IRON
FEO
Lunar regolith
Dielectric permittivity
Compact polarimetry
LRO Mini-RF
Stokes parameters
Anisotropy
 
Description A new model has been developed to estimate the dielectric permittivity of the lunar surface regolith using S-band hybrid compact polarimetric SAR data obtained from Mini-RF aboard LRO. The surface regolith is modeled as a random medium consisting of elementary ellipsoidal particles smaller than the incident wavelength of S-band. The data, available in the form of Stokes vector, are used to derive a coherency matrix, under the reflection symmetry condition, whose elements are used to calculate the particle anisotropy parameter. Since the anisotropy is bounded by the dielectric permittivity, its relationship with the latter is used for the required estimation. The method is applied to compute the dielectric permittivity of Apollo 17 landing site in Taurus-Littrow valley and to a part of Sinus Iridum. The estimated mean dielectric permittivity values (2.87 +/- 0.31) and (3.04 +/- 0.31), respectively, are consistent with the previous estimates. The dielectric permittivity values have also been used to discern different units of regolith in both the regions. The advantage of our model is that it does not require any a priori knowledge about the density or composition of the regolith. The available data in the form of Stokes parameters are sufficient for the computation. The model predicts a thin layer of low density, porous fine grained dust on the lunar surface. (C) 2015 COSPAR. Published by Elsevier Ltd. All rights reserved.
 
Publisher ELSEVIER SCI LTD
 
Date 2016-01-14T13:00:17Z
2016-01-14T13:00:17Z
2015
 
Type Article
 
Identifier ADVANCES IN SPACE RESEARCH, 56(11)2439-2448
0273-1177
1879-1948
http://dx.doi.org/10.1016/j.asr.2015.10.007
http://dspace.library.iitb.ac.in/jspui/handle/100/17560
 
Language en