Radio wave distance measuring apparatus and radio waves ranging method .

摘要

PROBLEM TO BE SOLVED: To provide a radiowave range finding device, capable of measuring the distance between terminal devices with high accuracy, even under a low receiving level condition, when the distance between the terminal devices is measured by a radio signal.;SOLUTION: An instrument 19 for measuring the time between frames measures information on the distance between the terminal devices, by the number of periods (pulses) of a reference clock S83 of a first terminal device generated in the interval of the difference in time between a reference frame signal S81 generated by the reference clock S83 of the first terminal device 1 being a transmission side, and a decoded frame signal S82 generated by decoding a received signal from a second terminal device 2 being a reception side. Moreover, a clock-phase-difference measuring instrument 20a measures for each clock pulse the difference in phase between the reference clock S83 and a demodulated clock S84 regenerated from the received signal, and generates a correction value to be acquired by smoothing the measurement results of the phase differences. The clock-phase-difference measuring instrument 20a outputs information on a corrected distance acquired by adding a correction value to the distance information acquired by measurement with the time measuring instrument 19.;COPYRIGHT: (C)2012,JPO&INPIT