An Analysis of Through- and In-the-Wall UWB Impulse Radar. Systems Design Considerations

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Authors
  1. Barrie, G.
  2. Tunaley, J.K.E.
Corporate Authors
Defence R&D Canada - Ottawa, Ottawa ONT (CAN)
Abstract
Military applications of through-wall radar requires the ability to detect targets through relatively high-density materials such as concrete, stone and brick. These materials can result in considerable attentuation of electromagnetic waves, increasing requirements for both radar power and signal processing. Wall attenuation becomes a prominent limitation in the ensuing power budget. For the preliminary investigation undertaken here, conflicting physical requirements for high resolution and signal penetrating power are matched against the hardware and data processing limitations of large dynamic range, sampling rate and interference. If the radar signal must penetrate concrete block, a practical operational frequency is about 3 GHz, and the usable frequency range is no greater than approximately 10 GHz. On the other hand, for common wall materials other than concrete block, and assuming that the material is dray, dynamic range does not constrain the resolution. Much higher resolutions in the millimeter range are possible. The assumptions that the two-way attentuation can be up to 30 dB (at 10 GHz, say) and that the ratio of the RCSs can range over 20 dB imply that the dynamic range at the radar front-end must be at least 50 dB. This does not, however, address the multipath effects, which are statistical in nature, nor does it address the increased attenuation due to moisture in the blocks. An additional fade margin needs to be built into the power budget to maintain an accept

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Keywords
Ultra-Wideband radar;Impulse radar;Through-wall imaging;In-wall imaging;Wall attenuation;Through-Wall radar;UWB (Ultra WideBand)
Report Number
DRDC-OTTAWA-TM-2003-134 — Technical Memorandum
Date of publication
01 Sep 2003
Number of Pages
25
DSTKIM No
CA023085
CANDIS No
520165
Format(s):
Hardcopy;CD ROM

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