&lt;title&gt;Performance of high-frame-rate, back-illuminated CCD imagers&lt;/title&gt;

Lawler, William B.; Harrison, Lorna J.; Levine, Peter; Sauer, Donald J.; Hseuh, Fu-Lung; Shallcross, F. V.; Meray, Grazyna M.; Taylor, G.

doi:10.1117/12.172774

Cited by 7 publications

(2 citation statements)

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“…Starting with Eq. (1) it can be shown directly that S(i -i) + S(-i -) = 2f s(f)e20cos(2,rf.F) di (6) or in terms of real and imaginary parts as S'( -i) + S'(-F -i) = 2j' s'(f) cos(2ir f.i) di (7) and -i) + S"( -i -i) = 2f s"(f) cos (2ir f. i) di (8) where S(i) = S'() + iS"() Note that we will use a single prime to indicate the real part of a complex function and a double prime to indicate the imaginary part of a complex function. The parameter i is the vector offset of the output images.…”

Section: The Optical Processormentioning

confidence: 99%

<title>Optical processor for SAR image formation: system development</title>

et al. 1994

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We describe the current status of a hybrid optical processor being developed for real-time synthetic aperture radar (SAR) image formation. The processor is being developed for insertion into the ERIM spotlight mode SAR airborne data collection system under the ARPA TOPS program monitored by of the Army Research Lab. A 2-D Fourier transforming time-integrating interferometrically based optical processor is a key element of the system. The optical processor uses a modulated laser diode for radar signal insertion, crossed 1-D acousto-optic scanners for 2-D scanning, a modified Köster interferometer for fringe generation, and fast detector arrays for light detection and integration. The image space-bandwidth-product and dynamic range are enhanced by processing time-multiplexed interlaced image subpatches at real-time rates. Digital pre-and post-processing play essential roles in the system enhancement. The final image is a mosaic of the subpatch images. The optical processor design approach lends itself to the important attributes of high (real-time) data rates, multiple SAR mode processing capabilities, compact and rugged packaging, and power efficiency. INTRODUCTIONThe development and airborne demonstration of a compact real-time optical processor for synthetic aperture radar (SAR) signal processing is being performed under the ARPA TOPS Program through the Army Research Laboratory. Airborne insertion demonstration will be accomplished using the ERIM flight facilities and CV-580 aircraft with its state-of-art SAR system, the ERIM DCS (Data Collection System). The program includes development of the processor interfaces and instrumentation for monitoring flight operations and collecting test data and imagery.Synthetic aperture radar development began in the 1950's and it has evolved into an effective fine resolution imaging sensor. Real-time SAR image formation processing places very demanding requirements on processor performance. The required two-dimensional processing of large time bandwidth product (or space bandwidth product) data, generally requiring correlation and/or Fourier transform operations, provide the inspiration for applying optical techniques to address the computational as well as the quick access memory needs. Our optical processor development described here uses these important features with the attributes of power efficient real-time operation, small size, and adaptability.As indicated the optical processor is being designed for insertion into the ERIM DCS. This radar system has been described in a previous publication and only a short summary will be given here1. It is a fine-resolution spotlight mode SAR. As the aircraft flies along, the radar antenna is aimed to continually illuminate or spotlight a scene of interest during the desired integration time. See Fig. 1. Potentially, it could illuminate a spot with 90° of line-of-sight rotation. Typically, a much smaller angle is needed to obtain the desired resolution. After the required angular extent has been obtained the antenna is aimed to ill...

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Section: The Optical Processormentioning

confidence: 99%

<title>Optical processor for SAR image formation: system development</title>

et al. 1994

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“…Starting with Eq. (1) it can be shown directly that and S"(i -) + S"(-i -) = 2fs"(f) cos(2irf.F) df (7) where S(i) = S'(i) + iS"(F) (8) and --2r1fr0 , . "- (9 …”

Section: The Optical Processormentioning

confidence: 99%

<title>Optical processor for SAR image formation: performance trades</title>

Aleksoff

Subotic

1995

SPIE Proceedings

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We present characteristics, consider some performance trades, and give experimental results for an optoelectronic processor for synthetic aperture radar (SAR) image formation. A 2-D Fourier transforming time-integrating interferometricaliy based optical processor is a key element of the system. The optical processor uses a modulated laser diode for radar signal insertion, crossed 1-D acousto-optic scanners for 2-D scanning, a modified Köster interferometer for fringe generation, and fast detector arrays (cameras) for light detection and integration. The image dynamic range is enhanced by processing many camera frames. Digital pre-and post-processing play essential roles in the system enhancement

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