Ship Detection and Measurement of Ship Motion by Multi-Aperture Synthetic Aperture Radar
SAR (Synthetic Aperture Radar) GMTI (Ground Moving Target Indication) studies of ship signatures over a ten year period have developed an adaptive approach to the creation of ensembles of adaptive range-history models that characterize ship motion, ship length and ship heading from multi-aperture ai...
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ftdtic:AD1017665 2023-05-15T17:22:57+02:00 Ship Detection and Measurement of Ship Motion by Multi-Aperture Synthetic Aperture Radar Livingstone,Chuck Dragosevic,Marina Chu,Shen Defence Research and Development Canada Ottawa Ottawa, Ontario Canada 2014-06-01 text/html http://www.dtic.mil/docs/citations/AD1017665 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD1017665 en eng http://www.dtic.mil/docs/citations/AD1017665 Approved For Public Release; Ship motion detection Synthetic aperture radar MOVING TARGET INDICATOR radar sea motion GMTI DPCA ATI EDPCA range history phase history airborne SAR-GMTI space-based SAR-GMTI time-frequency decomposition non-parametric detection parametric detection velocity estimation ship length ship heading Text 2014 ftdtic 2017-04-30T14:46:54Z SAR (Synthetic Aperture Radar) GMTI (Ground Moving Target Indication) studies of ship signatures over a ten year period have developed an adaptive approach to the creation of ensembles of adaptive range-history models that characterize ship motion, ship length and ship heading from multi-aperture airborne and space-based radar measurements. The ships being detected and measured are assumed to be rigid bodies that move in response to propulsion and sea motion forces. Non-parametric moving target detection and motion estimation metrics are applied to radar returns from ship targets to represent each observed ship as an ensemble of spatially clustered moving targets whose motions, clustered into domains over the ship target area, estimated metrics are fed back to range-history models to improve the SAR focusing of the ship and to improve the motion estimation accuracy. DPCA (Displaced Phase Center Antenna)moving-target detection algorithms were used to generate lists of moving-target candidate points from two and four aperture SAR-GMTI scenes and the signal data corresponding to these points were analyzed to cancel sampling ambiguities from ships and littoral zone land targets prior to target motion estimation for each sample point. At the end of the estimation process target samples were clustered to extract the ensemble (bulk) properties of the ship target. When highly over-sampled GMTI data are acquired from airborne radars, coherent processing intervals that correspond to ocean wave periods that influence ship motion are obtained and ocean motion estimates can be extracted from the ship data using time-frequency analysis. The incorporation of the ocean motion estimates into the range history set that represents the ship allows fine SAR focusing of the ship image. An example is shown for a 167 m ship transiting off the coast of Newfoundland. Text Newfoundland Defense Technical Information Center: DTIC Technical Reports database |
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Open Polar |
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Defense Technical Information Center: DTIC Technical Reports database |
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language |
English |
topic |
Ship motion detection Synthetic aperture radar MOVING TARGET INDICATOR radar sea motion GMTI DPCA ATI EDPCA range history phase history airborne SAR-GMTI space-based SAR-GMTI time-frequency decomposition non-parametric detection parametric detection velocity estimation ship length ship heading |
spellingShingle |
Ship motion detection Synthetic aperture radar MOVING TARGET INDICATOR radar sea motion GMTI DPCA ATI EDPCA range history phase history airborne SAR-GMTI space-based SAR-GMTI time-frequency decomposition non-parametric detection parametric detection velocity estimation ship length ship heading Livingstone,Chuck Dragosevic,Marina Chu,Shen Ship Detection and Measurement of Ship Motion by Multi-Aperture Synthetic Aperture Radar |
topic_facet |
Ship motion detection Synthetic aperture radar MOVING TARGET INDICATOR radar sea motion GMTI DPCA ATI EDPCA range history phase history airborne SAR-GMTI space-based SAR-GMTI time-frequency decomposition non-parametric detection parametric detection velocity estimation ship length ship heading |
description |
SAR (Synthetic Aperture Radar) GMTI (Ground Moving Target Indication) studies of ship signatures over a ten year period have developed an adaptive approach to the creation of ensembles of adaptive range-history models that characterize ship motion, ship length and ship heading from multi-aperture airborne and space-based radar measurements. The ships being detected and measured are assumed to be rigid bodies that move in response to propulsion and sea motion forces. Non-parametric moving target detection and motion estimation metrics are applied to radar returns from ship targets to represent each observed ship as an ensemble of spatially clustered moving targets whose motions, clustered into domains over the ship target area, estimated metrics are fed back to range-history models to improve the SAR focusing of the ship and to improve the motion estimation accuracy. DPCA (Displaced Phase Center Antenna)moving-target detection algorithms were used to generate lists of moving-target candidate points from two and four aperture SAR-GMTI scenes and the signal data corresponding to these points were analyzed to cancel sampling ambiguities from ships and littoral zone land targets prior to target motion estimation for each sample point. At the end of the estimation process target samples were clustered to extract the ensemble (bulk) properties of the ship target. When highly over-sampled GMTI data are acquired from airborne radars, coherent processing intervals that correspond to ocean wave periods that influence ship motion are obtained and ocean motion estimates can be extracted from the ship data using time-frequency analysis. The incorporation of the ocean motion estimates into the range history set that represents the ship allows fine SAR focusing of the ship image. An example is shown for a 167 m ship transiting off the coast of Newfoundland. |
author2 |
Defence Research and Development Canada Ottawa Ottawa, Ontario Canada |
format |
Text |
author |
Livingstone,Chuck Dragosevic,Marina Chu,Shen |
author_facet |
Livingstone,Chuck Dragosevic,Marina Chu,Shen |
author_sort |
Livingstone,Chuck |
title |
Ship Detection and Measurement of Ship Motion by Multi-Aperture Synthetic Aperture Radar |
title_short |
Ship Detection and Measurement of Ship Motion by Multi-Aperture Synthetic Aperture Radar |
title_full |
Ship Detection and Measurement of Ship Motion by Multi-Aperture Synthetic Aperture Radar |
title_fullStr |
Ship Detection and Measurement of Ship Motion by Multi-Aperture Synthetic Aperture Radar |
title_full_unstemmed |
Ship Detection and Measurement of Ship Motion by Multi-Aperture Synthetic Aperture Radar |
title_sort |
ship detection and measurement of ship motion by multi-aperture synthetic aperture radar |
publishDate |
2014 |
url |
http://www.dtic.mil/docs/citations/AD1017665 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD1017665 |
genre |
Newfoundland |
genre_facet |
Newfoundland |
op_relation |
http://www.dtic.mil/docs/citations/AD1017665 |
op_rights |
Approved For Public Release; |
_version_ |
1766109893333352448 |