Ultra-wideband Synthetic Aperture. Data and Image Processing

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Authors
  1. Barrie, G.
Corporate Authors
Defence R&D Canada - Ottawa, Ottawa ONT (CAN)
Abstract
This document presents the details of a preliminary investigation into the design and fiture implementation of an Ultra-Wideband Short-pulse (UWB-SP) synthetic aperture through wall imaging system. Two major components, data collection and image formation, are examined, and factors impacting such a system's ultimate performance and capability are considered. A prototype data collection system is developed and used to record sets of one-dimensional data. Processing techniques are developed to extract a useable signal. Noise and clutter levels are estimated to quantify the resulting processing gain. The report outlines how data processing requirements are established based on system parameters such as PRF and sampling rate. A signal model is established, where a fourth-order Gaussian derivative simulates scattered target returns. Qualitative agreement with measured data is observed in both time and frequency domains. Appendices provide details on construction and application of analytic signals in modelling and simulation. Time-domain matched-filtering is employed for image formation. A theoretical development of the so-called backprojection technique is provided, along with algorithm implementation details. MATLAB code of representative routines is provided in an appendix. It was found that a filtered backprojection technique is required to reduce processing artifacts such as 1/r tails in the image map. Applications of a simple ramp filter in the wavenumber domain produces an

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Keywords
Ultra-Wideband radar;Synthetic Aperture imaging;Backprojection;Through-wall imaging;Time domain;Matched filter processing
Report Number
DRDC-OTTAWA-TM-2003-015 — Technical Memorandum
Date of publication
01 Jan 2003
Number of Pages
61
DSTKIM No
CA022085
CANDIS No
518888
Format(s):
Hardcopy;CD ROM

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