FIELD: determining present location of vehicle moving along electromagnetic wave propagating facility. SUBSTANCE: device has electromagnetic- wave transmitting, reflecting, and detecting means, radiated and reflected waves comparison means, and processing means for results obtained from comparison means. Radiated and reflected wave propagation means are, essentially, radiating propagation facilities. Radiated and reflected electromagnetic waves are frequency modulated. Electromagnetic wave reflecting means are designed for converting carrier frequency of electromagnetic wave. Detecting means provide for converting electromagnetic wave carrier into its original frequency. Processing means are used for processing results by measuring phase difference between carrier of radiated waves and that of detected waves. EFFECT: enhanced precision of vehicle location. 5 cl, 3 dwg
