Patent ID: 7535953

Claim:
A time information transmitter-receiver comprising: a time count section for counting current time; a first antenna; a frequency conversion section for synthesizing a received signal received by the first antenna with an oscillation signal having a predetermined frequency, and converting the synthesized signal into an intermediate frequency signal; a reference oscillation signal generation section for generating a signal having a phase synchronized with a phase of the intermediate frequency signal; a time information detection output section for detecting the intermediate frequency signal based on the signal generated by the reference oscillation signal generation section, and outputting time information; a transmission time generation section for correcting the current time counted by the time count section based on the time information outputted by the time information detection output section, and generating transmission time information from the corrected current time; an oscillation signal generation section for generating the oscillation signal having the predetermined frequency, by multiplying or dividing the signal generated by the reference oscillation signal generation section; a multiplied signal generation section for generating a multiplied signal having a same frequency as a frequency of the received signal by multiplying the signal generated by the reference oscillation signal generation section by the oscillation signal having the predetermined frequency; a transmission signal generation section for generating a transmission signal obtained by modulating an amplitude of the multiplied signal, as a carrier wave having the same frequency as the frequency of the received signal, based on the transmission time information; a phase shift section for shifting a phase of the transmission signal generated by the transmission signal generation section; and a second antenna for transmitting the transmission signal the phase of which is shifted by the phase shift section, wherein the phase shift section shifts the phase of the transmission signal so that the phase of the transmission signal coincides with a phase of the received signal when the second antenna transmits the transmission signal.