| 摘要 |
PROBLEM TO BE SOLVED: To calculate the azimuth angle of an incoming radio wave with high accuracy regardless of the signal format of a radio wave source.SOLUTION: The angle measurement device includes: two element antennas disposed apart from each other by more than 1/2 wavelength with respect to the wavelength of an incoming radio wave on a base line in the nose direction of a traveling object; a reference phase oscillator for outputting a predetermined reference phase signal; phase difference measurement units of a number corresponding to the number of the element antennas for measuring a phase difference between each of carrier wave signals received by the two antennas and the reference phase signal; a frequency difference measurement procedure for measuring the Doppler frequency of each of the carrier wave signals received by the two element antennas and the rate of change of the Doppler frequency by using a phase difference measurement value from the phase difference measurement unit; and an azimuth arithmetic unit for calculating an azimuth angle to a radio wave source by using the Doppler frequency and the rate of change of the Doppler frequency. |
