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Processing of Bistatic SAR Data From Quasi-Stationary Configurations

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

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Official 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.

Abstract

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.

Item URL in elib:https://elib.dlr.de/51931/
Document Type:Article
Title:Processing of Bistatic SAR Data From Quasi-Stationary Configurations
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Bamler, RichardUNSPECIFIEDUNSPECIFIED
Meyer, FranzUNSPECIFIEDUNSPECIFIED
Liebhart, WernerUNSPECIFIEDUNSPECIFIED
Date:November 2007
Journal or Publication Title:Geoscience and Remote Sensing, IEEE Transactions on
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:Yes
Volume:Vol. 45
DOI :10.1109/TGRS.2007.895436
Page Range:pp. 3350-3358
Publisher:IEEE
ISSN:0196-2892
Status:Published
Keywords:Bistatic SAR, equivalent velocity, nonhyperbolic range history, NuSAR, orbit curvature, synthetic aperture radar (SAR)
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W - no assignment
DLR - Research area:Space
DLR - Program:W - no assignment
DLR - Research theme (Project):W - no assignment (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute
Remote Sensing Technology Institute > SAR Signal Processing
Deposited By: Roehl, Cornelia
Deposited On:23 Jan 2008
Last Modified:27 Apr 2009 14:29

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