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BACK TO INDEX Publications of year 1985 Articles in journal or book chapters
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| Abstract: | Digital synthetic-aperture radar (SAR) imaging techniques have previously only been reported in the literature in a fragmentary manner. This article presents a comprehensive review of the theory of digital SAR imaging from Earth-orbiting satellites. The digital SAR imaging process is explained, including a discussion of various aspects which are specific to satellite-borne SAR. A number of relevant digital-processing techniques are reviewed and it is shown how these techniques may be applied to the processing of digital SAR data. The range migration problem is discussed and various techniques for overcoming it are presented. The paper should be useful not only to the designer of SAR processors, but also to the user of digital SAR data and images. |
@ARTICLE{barber85:SAR,
author = {B. C. Barber},
title = {{Theory of Digital Imaging from Orbital Synthetic-Aperture Radar}},
journal = {International Journal of Remote Sensing},
year = {1985},
volume = {6},
pages = {1009-1057},
number = {7},
abstract = {Digital synthetic-aperture radar (SAR) imaging techniques have previously only been reported in the literature in a fragmentary manner. This article presents a comprehensive review of the theory of digital SAR imaging from Earth-orbiting satellites. The digital SAR imaging process is explained, including a discussion of various aspects which are specific to satellite-borne SAR. A number of relevant digital-processing techniques are reviewed and it is shown how these techniques may be applied to the processing of digital SAR data. The range migration problem is discussed and various techniques for overcoming it are presented. The paper should be useful not only to the designer of SAR processors, but also to the user of digital SAR data and images.},
comment = {Comprehensive overview},
keywords = {SAR Processing, Range Migration, Range Compression, Range Polynomial, Azimuth Processing, Upsampling, 2D Filter, Time Domain Correlation, Satellite SAR},
pdf = {http://www.geo.uzh.ch/~ofrey/protected/PAPERS/barber85.pdf}
}
Keywords: SAR Processing, Image analysis, motion, Image motion analysis, Sea ice, Sea surface electromagnetic scattering, Synthetic-aperture radar.
| Abstract: | Using digital SEASAT synthetic aperture radar (SAR) imagery, high-precision densely sampled maps of ice motion have been derived by tracking ice features to determine the small-scale spatial variability of ice deformation. The digital SAR imagery was processed to remove geometric distortions and located on the Earth to an accuracy of about 100 m utilizing an algorithm based on the spacecraft orbital data and the characteristics of the SAR data collection system, independent of attitude information or ground reference points. Radiometric enhancement of the imagery using a variable linear stretch algorithm was performed to remove a system-related gradient and improve the identification of sea ice features. Using ice features common to an overlapping pair of images, vector plots of ice motion were then produced. Examples of ice motion are shown in the marginal ice zone and in the central ice pack where mean displacements of 15.3 km/day and 5.0 km/day were measured, respectively. Considering errors in Earth location with those in feature identification an overall error of 150-200 m in displacement measurements was estimated. The ice motion vector plots indicate a high degree of spatial deformation, demonstrating the potential value of spaceborne SAR data for production of precision large-scale maps of ice displacement with a spatial resolution of ice deformation on scales much less than 100 km. |
@ARTICLE{curlanderHoltHussey85:SeaIce,
author = {John C. Curlander and Benjamin Holt and Kevin J. Hussey},
title = {Determination of sea ice motion using digital SAR imagery},
journal = {Oceanic Engineering, IEEE Journal of},
year = {1985},
volume = {10},
pages = {358--367},
number = {4},
abstract = {Using digital SEASAT synthetic aperture radar (SAR) imagery, high-precision densely sampled maps of ice motion have been derived by tracking ice features to determine the small-scale spatial variability of ice deformation. The digital SAR imagery was processed to remove geometric distortions and located on the Earth to an accuracy of about 100 m utilizing an algorithm based on the spacecraft orbital data and the characteristics of the SAR data collection system, independent of attitude information or ground reference points. Radiometric enhancement of the imagery using a variable linear stretch algorithm was performed to remove a system-related gradient and improve the identification of sea ice features. Using ice features common to an overlapping pair of images, vector plots of ice motion were then produced. Examples of ice motion are shown in the marginal ice zone and in the central ice pack where mean displacements of 15.3 km/day and 5.0 km/day were measured, respectively. Considering errors in Earth location with those in feature identification an overall error of 150-200 m in displacement measurements was estimated. The ice motion vector plots indicate a high degree of spatial deformation, demonstrating the potential value of spaceborne SAR data for production of precision large-scale maps of ice displacement with a spatial resolution of ice deformation on scales much less than 100 km.},
keywords = {SAR Processing, Image analysis, motion, Image motion analysis, Sea ice, Sea surface electromagnetic scattering, Synthetic-aperture radar},
owner = {ofrey},
pdf = {http://www.geo.uzh.ch/~ofrey/protected/PAPERS/curlanderHoltHussey85.pdf},
timestamp = {2006.03.24},
url = {http://ieeexplore.ieee.org/iel6/48/25744/01145134.pdf}
}
Keywords: SAR Processing, Doppler Centroid, Doppler Centroid Estimation, Doppler Ambiguity Resolver, DAR, Clutterlock, Satellite SAR, SEASAT, Doppler Rate Estimation, Autofocus.
| Abstract: | Problems in the determination of Doppler parameters for spaceborne synthetic-aperture radar (SAR) data processing are examined. The degradations in image quality due to errors in these parameters are summarized. We show that these parameters can be estimated using accurate spacecraft ancillary data. In cases where such data are not available, we propose two techniques to estimate these parameters using the coherent radar return. These techniques were tested with the Seasat SAR data and the test results demonstrate that the accuracies achieved exceed the system performance requirements. Possible applications of these techniques in other areas of SAR data utilization are briefly discussed. |
@ARTICLE{li85:DopCentrEst,
author = {Fuk-Kwok Li and Daniel N. Held and John C. Curlander and Chialin Wu},
title = {{Doppler Parameter Estimation for Spaceborne Synthetic-Aperture Radars}},
journal = {IEEE Transactions on Geoscience and Remote Sensing},
year = {1985},
volume = {23},
pages = {47-56},
number = {1},
abstract = {Problems in the determination of Doppler parameters for spaceborne synthetic-aperture radar (SAR) data processing are examined. The degradations in image quality due to errors in these parameters are summarized. We show that these parameters can be estimated using accurate spacecraft ancillary data. In cases where such data are not available, we propose two techniques to estimate these parameters using the coherent radar return. These techniques were tested with the Seasat SAR data and the test results demonstrate that the accuracies achieved exceed the system performance requirements. Possible applications of these techniques in other areas of SAR data utilization are briefly discussed.},
keywords = {SAR Processing, Doppler Centroid, Doppler Centroid Estimation, Doppler Ambiguity Resolver, DAR, Clutterlock, Satellite SAR, SEASAT, Doppler Rate Estimation, Autofocus},
pdf = {http://www.geo.uzh.ch/~ofrey/protected/PAPERS/li85.pdf}
}
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Please note that access to full text PDF versions of papers is restricted to the Remote Sensing Laboratories of the University of Zürich.
Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to
adhere to the terms and constraints invoked by each author's copyright.
This collection of SAR literature is far from being complete.
It is rather a collection of papers which I store in my literature data base. Hence, the list of publications under PUBLICATIONS OF AUTHOR'S NAME
should NOT be mistaken for a complete bibliography of that author.
Last modified: Wed Sep 8 19:32:46 2010
Author: Othmar Frey , Remote Sensing Laboratories (RSL), University of Zurich, Switzerland .
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