The roadside sensor monitoring system uses the principle of ground-penetrating radar, i.e. it emits a radar signal passing through an optically opaque medium (snow) and receives a reflection from a hard surface (or shows the absence of such a reflection). Works only for snow, does not work for mud/water due to the rapid attenuation of the signal.
Relevance. In Russia, in winter, especially in the regions of the Arctic, Siberia and the Far East, a large number of highways are operated, the edge of which can often not be determined due to the snow layer. When the grader levels the snow cover on the road, the snow is leveled on the side of the road, where there is no longer a hard surface. As a result, the driver can move one wheel to the side of the road, especially when driving with another car, and overturn. This leads in harsh climatic conditions to great material losses and dangers to the life and health of drivers.
The principle of operation. The antenna module of the GPR sensor is placed on the bracket on the front–right of the car cab at a height of 50-100 cm. It emits a radio signal and receives a reflected signal from the snow surface and the hard surface. The radiation is directed at an angle to the side. If the hard surface begins to go down (i.e. the distance to the border of the hard surface increases) or disappears, an audible signal is given to the driver on the indicator. Sensor processing algorithms can distinguish between reflections from snow and hard surface.
Composition of the sensor system:
– antenna module. It has a radiation frequency of 7-8 GHz, does not contain batteries and can operate at -50 degrees, is in a protected IP67 case;
– USB cable with a sealed connection. Connects the antenna module and the indicator and serves to transmit power and signals. Length 4.5 m.;
– indicator. A small tablet computer in the driver’s cab that provides power, signal processing of the antenna module and the output of a sound signal approaching the road edge.