ACOUSTIC SYSTEM MEASURING DISTANCE Russian patent published in 1998 - IPC

FIELD: acoustic detection and ranging, railway transportation. SUBSTANCE: given acoustic system measuring distance may be used in particular for determination of distance covered by car measuring distance with reference to check objects. It has M passive receivers- transponders including n acoustic converters, 2n reflecting lattices, matching unit and receiving-transmitting antenna. Receiver of system includes limiter, amplifier, filter. master generator, mixer, controlled attenuator, detectors, comparators. System transmitter incorporates controlled master generator, controlled attenuator, power amplifier, matching unit, synchronization unit, information processing unit, computer and receiving-transmitting antennas. Specified acoustic system provides for high noise immunity and measurement accuracy of distances covered by car measuring distance at high speeds of its travel. EFFECT: high noise immunity and measurement accuracy. 3 cl, 2 dwg