Road surface condition detection device and road surface condition detection method

摘要

A radio waves receiving unit receives horizontally polarized waves and vertically polarized waves of radio waves radiated from an object at a radiation angle. An image generation unit generates a horizontally polarized waves image and a vertically polarized waves image based on the horizontally polarized waves and the vertically polarized waves, respectively. A polarization ratio calculation unit calculates, for each radiation angle, a polarization ratio which is a ratio of intensity of the horizontally polarized waves to the vertically polarized waves based on the horizontally polarized waves image and the vertically polarized waves image. A refractive index calculation unit calculates a refractive index of the object based on a change between polarization ratios of two different radiation angles. A road surface condition recognition unit recognizes a condition of a road surface based on the refractive index.

主权项

1. A road surface condition detection device comprising:
a radio waves receiving unit configured to receive intensity of horizontally polarized waves and intensity of vertically polarized waves of radio waves radiated from a road surface region at a radiation angle; a polarization ratio calculation unit configured to calculate, for each radiation angle, a polarization ratio which is a ratio of the intensity of the horizontally polarized waves and the intensity of the vertically polarized waves; a refractive index calculation unit configured to calculate a refractive index of the road surface region according to a change between polarization ratios of two different radiation angles calculated by the polarization ratio calculation unit; and a road surface condition recognition unit configured to recognize a condition of a road surface based on the refractive index calculated by the refractive index calculation unit.