METHOD OF DETERMINING STATE OF ROAD SURFACE Russian patent published in 2015 - IPC E01C23/07 G01N22/00 G01S13/00 

FIELD: measurement equipment.

SUBSTANCE: inspected section of the road surface is probed by electromagnetic waves, the electromagnetic waves reflected from this surface section are received, the phase shift between the falling and reflected waves or change of amplitude (power) of the received waves is determined with reference to their values for the falling waves, respectively, the main phase shift of these waves or the main change of amplitude (power) of these waves in absence of the covering layer on the road surface is determined. A passive reflector of the falling electromagnetic waves reflecting them in the direction opposite to the direction of the probing waves is buit-in into the surface layer of the inspected section of the road. The sounding is performed by the fixed frequency electromagnetic waves at some angle other than a right angle, and by the size of additional phase shift with reference to the main phase shift or additional change of amplitude (power) of the received waves with reference to the main change of amplitude (power) of these waves the state of the road surface is obvious.

EFFECT: higher accuracy.

4 cl, 5 dwg