Radio wave arrival direction estimation device, radio wave arrival direction estimation method, and radio wave arrival direction estimation program

A radio wave arrival direction estimation method comprising:

• controlling a rotation drive to rotate an antenna having a non-uniform antenna pattern to sequentially direct the antenna in a plurality of different directions, and acquiring each of antenna angles indicating the plurality of different directions in which the antenna is sequentially directed;
• measuring reception intensities at which the antenna has received a radio wave at each of the acquired antenna angles during the rotation;
• calculating a matching degree between the acquired antenna angle and the measured reception intensity and an antenna pattern of the antenna for each acquired antenna angle, wherein the calculating comprises:
• obtaining a difference between the reception intensity measured at each of the acquired antenna angles and a gain of the antenna pattern corresponding to the acquired antenna angle,
• aggregating the differences to determine a total difference value for each acquired antenna angle, and
• computing the matching degree based on the total difference value for each acquired antenna angle;
• and
• estimating an antenna angle at which the calculated matching degree is the maximum, corresponding to where the calculated total difference value is the minimum, as an arrival direction of the radio wave.

A non-transitory computer-readable storage medium storing a radio wave arrival direction estimation program for enabling a computer to perform operations comprising:

• controlling a rotation drive to rotate an antenna having a non-uniform antenna pattern to sequentially direct the antenna in a plurality of different directions, and acquiring each of antenna angles indicating the plurality of different directions in which the antenna is sequentially directed;
• measuring reception intensities at which the antenna has received a radio wave at each of the acquired antenna angles during the rotation;
• calculating a matching degree between the acquired antenna angle and the measured reception intensity and an antenna pattern of the antenna for each acquired antenna angle, wherein the calculating comprises:
• obtaining a difference between the reception intensity measured at each of the acquired antenna angles and a gain of the antenna pattern corresponding to the acquired antenna angle,
• aggregating the differences to determine a total difference value for each acquired antenna angle, and
• computing the matching degree based on the total difference value for each acquired antenna angle;
• and
• estimating an antenna angle at which the calculated matching degree is the maximum, corresponding to where the calculated total difference value is the minimum, as an arrival direction of the radio wave.