Detection of Targets Behind Walls Using Ultra Wideband Short Pulse: Numerical simulation

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Authors
  1. Chamma, W.A.
  2. Kashyap, S.
Corporate Authors
Defence R&D Canada - Ottawa, Ottawa ONT (CAN)
Abstract
This work describes the use of a full-wave time-domain numerical procedure, based on the finite-difference time-domain (FDTD) method, to investigate the capabilities and limitations in the use of an ultra wideband (UWB) radar system to detect targets behind walls. A room with a concrete floor and wooden walls is modelled inside the FDTD lattice. The modelling assumes a transmitting antenna located outside the room and radiating a UWB pulse with a centre frequency of 2 GHz. A conducting cubic target is placed inside the room and the scattered field due to the cube is calculated using FDTD and is recorded at several receiver points outside the room. The back projection procedure is used to construct an image of the target. The above investigation is then repeated with the single target placed at different locations inside the room. Using the field information at various points outside the room, the movement of the target inside the room is traced and displayed. The effect of various parameters on the performance of the detection system is studied. These include the number of receiver and transmitter points and their separation distances both in a bistatic and monostatic radar setups. In the bistatic radar case it was observed that larger array aperture lengths produced a better-focused image while larger receiver separation distances produced higher sidelobes. However in the monostatic radar case, a better image is generated for smaller numbers of transmitter and receiver point

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Keywords
Through the wall surveillance;Through-wall imaging;UWB (Ultra WideBand);FDTD (Finite-Difference Time Domain)
Report Number
DRDC-OTTAWA-TM-2003-226 — Technical Memorandum
Date of publication
01 Nov 2003
Number of Pages
40
DSTKIM No
CA023531
CANDIS No
520861
Format(s):
Hardcopy;CD ROM

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