Ultra-Wideband Synthetic Aperture Radar Imaging. Effect of Off-Track Motion on Resolution

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Authors
  1. Boutros, J.
  2. Barrie, G.
Corporate Authors
Defence R&D Canada - Ottawa, Ottawa ONT (CAN)
Abstract
Ultra-wideband radars are capable of producing high-resolution images by combining the benefits of ultra-wideband short pulse technology and those of synthetic arrays. One particular application of this is in the area of through-wall sensing, where relatively low center frequencies enable good radio frequency (RF) penetration of typical building materials. This report discusses the effects of off-track platform motion on image resolution in the context of UWB impulse radar. It examines the distortion caused by positioning errors as radar motion traces out a synthetic aperture. Monte-Carlo type simulations were performed to generate normally distributed position errors in both range and azimuth, scaled according to a specified standard deviation ranging up to proportional to 30cm. The extent of image distortion is quantified by calculating the width of simulated target returns (in both range and azimuth), compared with a nominal configuration of known positions. A convenient metric for this comparison is the Full Width Half Maximum (FWHM). Computer code was written to automatically extract this information from the reconstructed image space. Further, this report provides a qualitative summary of the progressive degradation of imaging information, examining both range migration curves and the final reconstructed images. Results obtained from simulations indicate that for standard deviations up to the order of the system operating wavelength approximately 15cm), the percent erro

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Keywords
Impulse radar;SAR imaging;UWB (Ultra WideBand);Through-wall imaging;Through-Wall radar;Short-pulse (SP) Radars
Report Number
DRDC-OTTAWA-TM-2003-177 — Technical Memorandum
Date of publication
01 Nov 2003
Number of Pages
56
DSTKIM No
CA023244
CANDIS No
520479
Format(s):
Hardcopy;CD ROM

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