Patent ID: 7903022
Filing Date: 2011-03-08
Classification: G01S,H04B

Abstract:
1. A distance measuring apparatus, comprising: a transmitter, configured to transmit first one-frame signals from an antenna via radio waves having three or more different carrier frequencies, each of the first one-frame signals being composed of a request signal and a continuous carrier wave; a receiver, configured to receive second one-frame signals generated when the first one-frame signals are reflected by a reflector while being modulated, each of the second one-frame signals having a frequency corresponding to a frequency of an associated one of the first one-frame signals; a phase information acquirer, configured to calculate a phase change amount between the first one-frame signals and the second one-frame signals for each of the carrier frequencies; and a distance calculator, configured to calculate a distance between the antenna and the reflector by high-resolution spectrum analysis, on the basis of the carrier frequencies and the phase change amount calculated for each of the carrier frequencies.