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Polarimetric Modeling of Lunar Surface for Scattering Information Retrieval Using Mini-sar Data of Chandrayaan-1
| Content Provider | Semantic Scholar |
|---|---|
| Author | Kumar, Shashi Tolpekin, V. A. Vosselman, Marjoleine |
| Copyright Year | 2013 |
| Abstract | DISCLAIMER This document describes work undertaken as part of a programme of study at the Faculty of Geo-information Science and Earth Observation (ITC), University of Twente. All views and opinions expressed therein remain the sole responsibility of the author, and do not necessarily represent those of the faculty. ABSTRACT Mini-SAR of Chandrayaan-1 is the very first kind of hybrid polarimetric Radar flown outside the Earth's orbit. This sensor was employed to detect water ice deposits from the completely dark regions of the Moon. The hybrid polarimetric architecture of mini-SAR allows the measurement of the Stokes parameters of the backscattered signal. Decomposition techniques developed for this data include the ݉-δ and ݉-χ which have been used along with Circular polarization ratio (CPR) information to characterize the backscatter and look for water-ice deposits. This research presents an alternative to explore and study this data. H-α decomposition technique was used to extract the scattering information to study the physical properties of the targets. This approach utilizes the decomposition of Wolf's coherency matrix, derived from the Stokes parameters. The Eigen values and Eigen vectors estimated from the matrix decomposition are used in calculating the entropy (H) and mean alpha angle (α). The scattering mechanisms were characterized based on the combined interpretation of entropy and mean alpha angle. This technique was also employed to classify the targets based on their physical properties with the help of H-α plane. Surface scattering was found to be the dominant scattering pattern and most part of the lunar surface except the interior of craters were affected by this type of scattering. Double bounce reflections were difficult to categorize, but most of these patterns were encountered when the topography formed natural dihedral structures like the wall and the floor of the crater. The most important and interesting study was made with volume scattering component. High volume scattering was detected from inside the dark craters of the North Pole of the moon. The results were compared with the results obtained from the ݉-δ and ݉-χ decomposition techniques and CPR. The result of volumetric scattering from within the craters was validated against the Radar readings obtained from Greenland ice sheet and the icy planet of Europa. The high volume scattering could be attributed to anisotropic particles which could be buried ice or rocks. The H-α approach was successfully applied to hybrid polarimetric data to retrieve scattering information and in turn physical properties … |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www.itc.nl/library/papers_2013/msc/gfm/kausika.pdf |
| Alternate Webpage(s) | http://www.iirs.gov.in/iirs/sites/default/files/StudentThesis/M.Sc_.Thesis_Bhavya%20Kausika.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
