Patent ID: 11862858
Assignee: MITSUBISHI ELECTRIC CORPORATION
Field: Telecommunications (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 10:
11. A polarization direction method of measuring a polarization direction of a received wave using the polarization direction measuring device according to claim 1, the arrival direction of the received wave being defined by the AZ angle and the EL angle, the polarization direction method comprising:
receiving the received wave with the plurality of circularly polarized antennas;
detecting, by the detector, the third intensity ratio between two of the circularly polarized antennas of the received wave to be received at the plurality of circularly polarized antennas;
acquiring, by the acquiring unit, an arrival direction of the received wave;
acquiring, by the arithmetic unit, the first intensity ratio of a vertically polarized component of the received wave from the first intensity ratio table stored in the storage unit based on the acquired arrival direction of the received wave;
acquiring, by the arithmetic unit, the second intensity ratio of a horizontally polarized component of the received wave from the second intensity ratio table stored in the storage unit based on the acquired arrival direction of the received wave; and
calculating, by the arithmetic unit, the polarization direction of the received wave as a ratio of the horizontally polarized component and a ratio of the vertically polarized component, wherein the ratio of the horizontally polarized component is determined with expression (1) and the ratio of the vertically polarized component is determined with expression (2):

PH=(M−TV)/(TH−TV)  (1)

PV=1−PH  (2)

wherein: PH is the ratio of the horizontally polarized component,
PV is the ratio of the vertically polarized component,
TV is the first intensity ratio,
TH is the second intensity ratio, and
M is the third intensity ratio

wherein the calculating is performed from the predetermined calculation expression based on the intensity ratio of the received wave acquired by the detector, the intensity ratio of the vertically polarized component of the received wave, and the intensity ratio of the horizontally polarized component of the received wave.