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Processing of Bistatic SAR Data From Quasi-Stationary Configurations

Bamler, Richard und Meyer, Franz und Liebhart, Werner (2007) Processing of Bistatic SAR Data From Quasi-Stationary Configurations. Geoscience and Remote Sensing, IEEE Transactions on, Vol. 45 (11), Seiten 3350-3358. IEEE. DOI: 10.1109/TGRS.2007.895436. ISSN 0196-2892.

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Offizielle URL: http://ieeexplore.ieee.org/Xplore/login.jsp?url=/iel5/36/4373350/04358848.pdf&isnumber=4373350&prod=JNL&arnumber=4358848&arSt=3350&ared=3358&arAuthor=Bamler%2C+R.%3B+Meyer%2C+F.%3B+Liebhart%2C+W.


Standard synthetic aperture radar (SAR) processing algorithms use analytically derived transfer functions in the 2-D frequency and range/Doppler domains. These rely on the assumption of hyperbolic range histories of monostatic SARs with straight flight paths. For bistatic SARs, the range histories are no longer hyperbolic, and simple analytic transforms do not exist. This paper offers two solutions for bistatic SAR data processing under the restriction of quasi-stationarity, i.e., sufficiently equal velocity vectors of transmitter and receiver. 1) Moderately bistatic configurations can be handled satisfactorily by using hyperbolic range functions with a modified velocity parameter, which is a solution already well known for the accommodation of curved orbits in the monostatic case. This “equivalent velocity” approach is shown to be of surprising range of validity even for pronounced bistatic situations. It is not to be confused with the “equivalent monostatic flight path” approximation, which is shown to be inapplicable for any practical case. 2) With increasing separation of transmitter and receiver, the equivalent velocity approximation deteriorates. To cope with extreme bistatic configurations, a general approach named “NuSAR” is proposed, where the involved transfer functions are replaced by numerically computed ones. This paper describes how the transfer functions are computed from the given orbits and the shape of the Earth surface. In any of these two cases, the bistatic SAR data can be processed by standard SAR processors; only the conventional transfer functions need to be replaced. Neither are there time-domain prefocusing or postfocusing steps required nor complicated mathematical expansions involved. The presented algorithms are also applicable to very high resolution wide-swath (or squinted) SARs on curved orbits.

Titel:Processing of Bistatic SAR Data From Quasi-Stationary Configurations
AutorenInstitution oder E-Mail-Adresse der Autoren
Datum:November 2007
Erschienen in:Geoscience and Remote Sensing, IEEE Transactions on
Referierte Publikation:Ja
In ISI Web of Science:Ja
Band:Vol. 45
DOI :10.1109/TGRS.2007.895436
Seitenbereich:Seiten 3350-3358
Stichwörter:Bistatic SAR, equivalent velocity, nonhyperbolic range history, NuSAR, orbit curvature, synthetic aperture radar (SAR)
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W - keine Zuordnung
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W - keine Zuordnung
DLR - Teilgebiet (Projekt, Vorhaben):W -- keine Zuordnung (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Methodik der Fernerkundung
Institut für Methodik der Fernerkundung > SAR-Signalverarbeitung
Hinterlegt von: Cornelia Roehl
Hinterlegt am:23 Jan 2008
Letzte Änderung:27 Apr 2009 14:29

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