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181 results on '"Rigling, Brian D."'

12. Use of nonquadratic regularization in fourier imaging

Author

Rigling, Brian D.

Subjects
Algebraic logic -- Usage, Fourier analysis -- Reports, Imaging systems -- Usage, Imaging systems -- Analysis, Imaging technology, Aerospace and defense industries, Business, Computers, Electronics, Electronics and electrical industries
Abstract

In many Fourier imaging applications, the presence of unaccounted for amplitude or phase errors in the Fourier domain data can lead to a degraded system impulse response and high sidelobes in the image domain. Historically, many methods for data-driven correction of these effects have been proposed, and numerical optimization of nonquadratic, p-norm image quality metrics has recently emerged as a robust solution. This paper presents a tutorial examination of the sources of image sideiobes in Fourier imaging applications, and studies the effectiveness of p-norm regularization algorithms under various experimental conditions. Several observations are made, including comments on robustness to noise and methods for tapered window design and energy-constrained sparse aperture imaging. Image examples are presented as experimental validation.

Published
2009

13. Motion measurement errors and autofocus in bistatic SAR

Author

Rigling, Brian D. and Moses, Randolph L.

Subjects
Image processing -- Methods, Synthetic aperture radar -- Usage, Business, Computers, Electronics, Electronics and electrical industries
Abstract

The effect of motion measurement errors (MMEs) on measured bistatic synthetic aperture radar (SAR) phase history data that has been motion compensated to the scene origin is discussed. By deriving limits on the allowable MMEs to be used as system specifications, it is demonstrated that proper orientation of a bistatic SAR image during image formation process allows application of monostatic SAR autofocus algorithms in postprocessing to mitigate image defocus.

Published
2006

14. Three-dimensional surface reconstruction from multistatic SAR images

Author

Rigling, Brian D. and Moses, Randolph

Subjects
Three-dimensional graphics -- Research, Object recognition (Computers) -- Analysis, Pattern recognition -- Analysis, Synthetic aperture radar -- Research, Business, Computers, Electronics, Electronics and electrical industries
Abstract

The reconstruction of three-dimensional surfaces from multiple bistatic synthetic aperture radar (SAR) images is discussed. A framework for predicting the performance of multistatic stereo SAR algorithm is also proposed to suggest a metric for use in planning strategic deployment of multistatic assets.

Published
2005

15. Taylor expansion of the differential range for monostatic SAR

Author

Rigling, Brian D. and Moses, Randolph L.

Subjects
Synthetic aperture radar -- Research, Algorithms -- Research, Algorithm, Aerospace and defense industries, Business, Computers, Electronics, Electronics and electrical industries
Abstract

The polar format algorithm (PFA) for spotlight synthetic aperture radar (SAR) is based on a linear approximation for the differential range to a scatterer. We derive a second-order Taylor series approximation of the differential range. We provide a simple and concise derivation of both the far-field linear approximation of the differential range, which forms the basis of the PFA, and the corresponding approximation limits based on the second--order terms of the approximation.

Published
2005

17. Polar format algorithm for bistatic SAR

Author

Rigling, Brian D. and Moses, Randolph L.

Subjects
Synthetic aperture radar -- Research, Algorithms -- Research, Algorithm, Aerospace and defense industries, Business, Computers, Electronics, Electronics and electrical industries
Abstract

Matched filtering (MF) of phase history data is a mathematically ideal but computationally expensive approach to bistatic synthetic aperture radar (SAR) image formation. Fast backprojection algorithms (BPAs) for image formation have recently been shown to give improved O([N.sup.2][log.sub.2]N) performance. In this paper, an O([N.sup.2][log.sub.2]N) bistatic polar format algorithm (PFA) based on a bistatic far-field assumption is derived. This algorithm is a generalization of the popular PFA for monostatic SAR image formation and is highly amenable to implementation with existing monostatic image formation processors. Limits on the size of an imaged scene, analogous to those in monostatic systems, are derived for the bistatic PFA.

Published
2004

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