RADIO SIGNAL DEMODULATING DEVICE

It is an object of the present invention to provide a radio signal demodulating device in which fluctuation followability of transmission channel environment is improved. The radio signal demodulating device according to the present invention receives the amplitude of an information signal in which known pilot signals are multiplexed, as a radio signal modulated in proportion to the time change of frequency of a carrier wave. The radio signal demodulating device according to the present invention includes a frequency converting unit (2), a signal combining unit (3), a first pilot signal extracting unit (11), a second pilot signal extracting unit (13), a first pilot orthogonal signal generating unit (12), a second pilot orthogonal signal generating unit (14), a first error signal generating unit (16), a first weight factor updating unit for calculating a weight factor to be used in the signal combining unit, by using a first pilot orthogonal signal and a first error signal obtained by the first error signal generating unit.