The relationship between backprojection and best linear unbiased estimation in synthetic-aperture radar imaging

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May 2016, 10(2): 549-561. doi: 10.3934/ipi.2016011

The relationship between backprojection and best linear unbiased estimation in synthetic-aperture radar imaging

1.	Colorado State University, Department of Mathematics, 1874 Campus Delivery, Fort Collins, CO 80523-1874, United States

Received June 2015 Revised October 2015 Published May 2016

Abstract
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In this paper we investigate the relationship between two different techniques typically used in imaging and estimation problems. We focus on synthetic-aperture radar imaging and compare the methods of backprojection (standard for imaging) and best linear unbiased estimation (BLUE). We aim to reconstruct or estimate the reflectivity function of an object present in a scene of interest. We find that the estimate of the reflectivity (calculated using BLUE) and the reconstructed image (calculated using filtered backprojection) are the same when we utilize a criterion from microlocal analysis to define the optimal backprojection filter and assume the measured data is corrupted by zero-mean independently identically distributed (white) noise. In particular we show that the microlocal criterion for the optimal backprojection filter is equivalent to the unbiased constraint present in the BLUE technique.

Keywords: radar imaging, backprojection, best linear unbiased estimation, microlocal analysis., Synthetic-aperture radar.

Mathematics Subject Classification: Primary: 78A46, 94A13; Secondary: 35Q6.

Citation: Kaitlyn Muller. The relationship between backprojection and best linear unbiased estimation in synthetic-aperture radar imaging. Inverse Problems & Imaging, 2016, 10 (2) : 549-561. doi: 10.3934/ipi.2016011

References:

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[15]	H. C. Yanik, Analytic Methods for SAR Image Formation in the Presence of Noise and Clutter,, Ph.D. Thesis, (2014). Google Scholar
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References:

[1]	H. Ammari, J. Garnier and K. Solna, A statistical approach to target detection and localization in the presence of noise,, Waves in Random and Complex Media, 22 (2012), 40. doi: 10.1080/17455030.2010.532518. Google Scholar
[2]	G. Beylkin, Imaging of discontinuities in the inverse scattering problem by inversion of a causal generalized Radon transform,, J. Math. Phys., 26 (1985), 99. doi: 10.1063/1.526755. Google Scholar
[3]	M. Cheney and B. Borden, Fundamentals of Radar Imaging,, SIAM, (2009). doi: 10.1137/1.9780898719291. Google Scholar
[4]	A. Grigis and J. Sjostrand, Microlocal Analysis for Differential Operators: An Introduction,, in London Mathematical Society Lecture Note Series 196, 196 (1994). doi: 10.1017/CBO9780511721441. Google Scholar
[5]	S. Kay and G. F. Boudreaux-Bartels, On the optimality of the Wigner distribution for detection,, Acoustics, 10 (1985), 1017. doi: 10.1109/ICASSP.1985.1168129. Google Scholar
[6]	C. J. Nolan and M. Cheney, Microlocal Analysis of Synthetic Aperture Radar Imaging,, The Journal of Fourier Analysis and Applications, 10 (2004), 133. doi: 10.1007/s00041-004-8008-0. Google Scholar
[7]	H. V. Poor, An Introduction to Signal Detection and Estimation,, Springer-Verlag, (1988). doi: 10.1007/978-1-4757-3863-6. Google Scholar
[8]	D. C. Montgomery, E. A. Peck and G. G. Vining, Introduction to Linear Regression Analysis,, Wiley-Interscience, (2001). Google Scholar
[9]	S. Kay, Fundamentals of Signal Processing, vol. 1: Estimation Theory,, Prentice Hall, (1993). Google Scholar
[10]	D. J. Rossi and A. S. Willsky, Reconstruction from projections based on detection and estimation of objects - parts i and ii: performance analysis and robustness analysis,, IEEE Trans. Acoustics, 32 (1984), 886. doi: 10.1109/TASSP.1984.1164405. Google Scholar
[11]	M. E. Taylor, Pseudodiferential Operators,, Princeton University Press, (1981). Google Scholar
[12]	F. Treves, Introduction to Pseudodifferential and Fourier Integral Operators, Vol. I & II,, The University Series in Mathematics, (1980). Google Scholar
[13]	K. Voccola, Statistical and Analytical Techniques in Synthetic Aperture Radar Imaging,, Ph.D. Thesis, (2011). Google Scholar
[14]	K. Voccola, B. Yazici, M. Cheney and M. Ferrara, On the Relationship between the Generalized Likelihood Ratio Test and Backprojection Method for Synthetic-Aperture Radar Imaging,, SPIE Defense, (2009). Google Scholar
[15]	H. C. Yanik, Analytic Methods for SAR Image Formation in the Presence of Noise and Clutter,, Ph.D. Thesis, (2014). Google Scholar
[16]	B. Yazici, M. Cheney and C. E. Yarman, Synthetic-aperture inversion in the presence of noise and clutter,, Inverse Problems, 22 (2006), 1705. doi: 10.1088/0266-5611/22/5/011. Google Scholar

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