نتایج جستجو برای: techniques polarimetric

تعداد نتایج: 632640  

2009
Mickaël Duquenoy

This paper deals with the analysis of the non-stationary behavior of scatterers in polarimetric SAR imaging . A method based on continuous wavelet and incoherent polarimetric decompositions is proposed to extract the polarimetric timefrequency signatures of scatterers. These signatures characterize scatterers according to their polarimetric /or energetic behavior versus the emitted frequency an...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه زنجان - دانشکده علوم انسانی و اجتماعی 1392

most specialists in the field of foreign language teachingconsiderreading skill as an interactive process between the reader’s prior knowledge and the text.accordingly, the activation of prior knowledge for an effective comprehension is very important. it is generally agreed that the pre-reading phase is the stage where this type of interaction and activation may be enhanced throughcertain stra...

2012
Esra Erten Cristian Rossi Irena Hajnsek

The contribution of Polarimetric Synthetic Aperture Radar (PolSAR) images compared with the single-channel SAR in terms of temporal scene characterization has been found and described to add valuable information in the literature. However, despite a number of recent studies focusing on single polarized glacier monitoring, the potential of polarimetry to estimate the surface velocity of glaciers...

2007
Martin Hellmann Shane R. Cloude

This lecture presents the role of Polarimetry in SAR Interferometry. A general formulation for vector wave interferometry is presented that includes conventional scalar interferometry presented in the respective former lecture as a special case. Based on this formulation, the coherence optimization problem can be solved to obtain the optimum scattering mechanisms that lead to the best phase est...

2015
Mirmajid Mousavi

In this paper the most significant and recent polarimetric SAR (PolSAR) speckle filters that have been developed so far are reviewed and the effects of them on classification and their ability to preserve polarimetric properties along with their strength in noise reduction are studied. For this purpose, the PolSAR filters such as refined Lee, intensity driven adaptive neighborhood (IDAN), scatt...

2013
Mari-Ann N. Moen Laurent Ferro-Famil Anthony P. Doulgeris Stian N. Anfinsen Sebastian Gerland Torbjørn Eltoft

This paper explores polarimetric properties of Arctic sea ice. The analysis is performed in several steps. First, the SAR image is segmented into distinct classes using an unsupervised classification algorithm, which incorporates both polarimetric and statistical signal features. The algorithm has built in contextual smoothing through Markov Random Field modeling. The image segments are subsequ...

2009
Brent Bartlett Chabitha Devaraj Michael Gartley Carl Salvaggio John R. Schott Chester F. Carlson Joseph A. Shaw J. Scott Tyo

For sensing systems that characterize the spectro-polarimetric radiance reaching the camera, the origin of the sensed phenomenology is a complex mixture of sources. While some of these sources do not contribute to the polarimetric signature, many do such as the downwelled sky polarization, the target and background pBRDF(polarimetric bi-directional reflectance distribution function), the upwell...

2011
Victor D. Navarro-Sanchez Juan M. Lopez-Sanchez

In this paper we demonstrate some benefits of using polarimetric data in persistent scatterers interferometry (PSI). A polarimetric optimization approach is applied to TerraSAR-X dual-pol data, leading to a significant increase in the number of persistent scatterer candidates (PSCs) selected by the most commonly used criteria of quality, namely the amplitude dispersion index and the average int...

Journal: :Signal Processing 2012
Sandeep Gogineni Arye Nehorai

Polarimetric radar systems allow the flexibility of transmitting arbitrarily polarized waveforms that match the scattering profiles of the target. Since different types of targets have varying profiles, the advantages of a polarimetric radar system can fully be exploited only when the type of target is accurately estimated. However, accurate estimation requires a significant amount of training ...

2005
ALEXANDER V. RYZHKOV SCOTT E. GIANGRANDE TERRY J. SCHUUR

As part of the Joint Polarization Experiment (JPOLE), the National Severe Storms Laboratory conducted an operational demonstration of the polarimetric utility of the Norman, Oklahoma (KOUN), Weather Surveillance Radar-1988 Doppler (WSR-88D). The capability of the KOUN radar to estimate rainfall is tested on a large dataset representing different seasons and different types of rain. A dense gaug...

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