Surveillance Through Concrete Walls
DEFENCE RESEARCH AND DEVELOPMENT CANADA OTTAWA
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This report studies the capability of ultra wideband short-pulse UWB SP radar to provide through concrete walls surveillance including multistatic radar surveillance. Multistatic radar configurations are of interest since they can be used to do covert surveillance. A full wave electromagnetic simulator is used to generate high fidelity through wall radar data. These raw radar data are transformed into radar images using a generation image algorithm that is described in detail in this report. The delay of the electromagnetic wave due to concrete walls when included into the imaging algorithm considerably improves the radar images. The impact of various radar parameters and signal processing techniques on radar images are examined in detail. The goal is to optimize the development of a potential radar testbed for through-wall imaging applications. Radar images obtained using the image generation algorithm show that UWB SP radar can track targets moving inside a concrete room. The decrease in signal velocity within concrete walls has three effects on through-the-wall-imaging. It defocuses target images and displaces targets from their true positions. False targets can also be present in the radar images. The radar images are considerably improved by including the time of flight difference due to concrete walls into the image generation algorithm. Radar images of stationary objects, or the room layout, obtained using the image generation algorithm show that UWB SP radar can provide static mapping of the concrete room layout. Radar images obtained using different multistatic radar configurations show that multistatic imaging works as long as targets are not located in the direct coupling region.
- Numerical Mathematics
- Structural Engineering and Building Technology
- Military Intelligence
- Active and Passive Radar Detection and Equipment