frequency component u00b1 fs of a sub carrier to the frequency component separating portion 14 the frequency component separating portion 14 separates the received frequency component u00b1 fs into usb and lsb herein the lsb can be picked up by the configuration shown in fig4 b that is first i components and q components are extracted from input frequencies by means of an orthogonal mixer 14 a wherein the phase of the q components is changed by 90 u00b0 by a phase converter 14 b and the after phase changed q component and i components for which the phase has not been changed are synthesized by a synthesizer 14 c thereby extracting the lsb in addition usb can be picked up by the configuration shown in fig4 c that is first i components and q components are extracted from input frequencies by an orthogonal mixer 14 a wherein the phase of the q components is changed by u2212 90 u00b0 by a phase converter 14 d and the after phase changed q component and i components for which the phase has not been changed are synthesized by a synthesizer 14 c thereby extracting the usb the range calculating portion 13 shown in fig4 a calculates the range using the usb and.