Patent ID: 7542524
Filing Date: 2009-06-02
Classification: G04R,H04B,H04L

Abstract:
1. A radio wave receiver comprising: a carrier signal reproduction section for generating a carrier reproduction signal from a received signal received by an antenna, wherein the carrier reproduction signal has a same frequency as that of a carrier wave of the received signal, and a phase of the carrier reproduction signal is corrected using a phase correction signal so that the phase of the carrier reproduction signal becomes equal to that of the carrier wave of the received signal; a carrier phase shift multiplication section for shifting the phase of the carrier reproduction signal generated by the carrier signal reproduction section, by 90 degrees, and for outputting a carrier phase shift multiplied signal by multiplying the phase shifted carrier reproduction signal by the received signal, wherein a high frequency component of the carrier phase shift multiplied signal is blocked; a phase correction signal generation section for generating the phase correction signal to correct a phase shift between the carrier reproduction signal and the received signal, based on the carrier phase shift multiplied signal outputted from the carrier phase shift multiplication section, and for feeding the phase correction signal to the carrier signal reproduction section; a multiplication section for outputting a multiplied signal by multiplying the received signal by the carrier reproduction signal, wherein a high frequency component of the multiplied signal is blocked; a first phase shift section for outputting a first phase shift signal by shifting a phase of the multiplied signal outputted by the multiplication section, by 90 degrees; a second phase shift section for outputting a second phase shift signal by shifting a phase of the carrier phase shift multiplied signal outputted by the carrier phase shift multiplication section, by 90 degrees; a signal-to-be-added generation section for dividing one signal of the carrier phase shift multiplied signal outputted by the carrier phase shift multiplication section and the second phase shift signal outputted by the second phase shift section, by the first phase shift signal, and for outputting a signal-to-be-added by multiplying the divided signal by the other signal; and an output section for outputting a detection signal by adding the signal-to-be-added to the multiplied signal.