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.
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.
|Title:||Processing of Bistatic SAR Data From Quasi-Stationary Configurations|
|Journal or Publication Title:||Geoscience and Remote Sensing, IEEE Transactions on|
|In ISI Web of Science:||Yes|
|Page Range:||pp. 3350-3358|
|Keywords:||Bistatic SAR, equivalent velocity, nonhyperbolic range history, NuSAR, orbit curvature, synthetic aperture radar (SAR)|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Space|
|HGF - Program Themes:||W - no assignement|
|DLR - Research area:||Space|
|DLR - Program:||W - no assignement|
|DLR - Research theme (Project):||W -- no assignement (old)|
|Institutes and Institutions:||Remote Sensing Technology Institute|
Remote Sensing Technology Institute > SAR Signal Processing
|Deposited By:||Cornelia Roehl|
|Deposited On:||23 Jan 2008|
|Last Modified:||27 Apr 2009 14:29|
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