Statistics of SAR interferograms with application to moving target detection

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Authors
  1. Gierull, C.H.
Corporate Authors
Defence Research Establishment Ottawa, Ottawa ONT (CAN)
Abstract
This report examines the statistics of the phase and magnitude of SAR interferograms towards the deployment of along-track interferometry (ATI) for slow ground moving target indication (GMTI). Great importance is attached to the practical applicability of the derived theoretical results, particularly with regard to the experimental MTI-mode of Radarsat2. Therefore, the results are evaluated with experimental airborne SAR data acquired during flight trials conducted in Petawawa in 1999. While the known probability density function (pdf) of the interferogram's phase (derived under the assumption of Gaussian backscatter) is shown to agree almost perfectly for a wide variety of backscatter conditions, the corresponding magnitude's pdf tneds to deviate strongly in most cases. Motivated by this discrepancy, a novel distribution is derived for the interferogram's magnitude. This pdf, called the polynomial or p-distribution, matches the real data much more accurately, particularly for extremely heterogeneous composite terrain. TRUNCATED

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Keywords
ATI (Along-track interferometry);GMTI (Ground Moving Target Indicator)
Report Number
DREO-TR-2001-045 — Technical Report
Date of publication
01 Jul 2001
Number of Pages
69
DSTKIM No
CA011559
CANDIS No
516111
Format(s):
Hardcopy;Document Image stored on Optical Disk

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