A quasi-optical multi-ray model for a short-range millimeter wave radar is presented.\nThe model considers multi-path effects emerging while multiple rays are scattered from the target\nand reflected to the radar receiver. Among the examined scenarios, the special case of grazing ground\nreflections is analyzed. Such a case becomes relevant when short range anti-collision radars are\nemployed in vehicles. Such radars operate at millimeter wavelengths, and are aimed at the detection\nof targets located several tens of meters from the transmitter. Reflections from the road are expected\nto play a role in the received signal strength, together with the direct line-of-sight beams illuminated\nand scattered from the target. The model is demonstrated experimentally using radar operating in\ntheW-band. Controlled measurements were done to distinguish between several scattering target\nfeatures. The experimental setup was designed to imitate vehicle near-ground millimeter wave radars\noperating in vehicles. A comparison between analytical calculations and experimental results is made\nand discussed.
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