Three-dimensional slope detection device and slope detection method thereof

A slope detection method of base station antenna for mobile communication comprising:

• calculating a horizontal plane of a horizontal coordinate system through a gravity sensor;
• calculating, from light quantity data of sunlight measured by multiple optical sensors provided on a spherical surface in a manner that face different directions and measure a quantity of the sunlight, an incidence vector for an incidence direction of the sunlight on the basis of a local coordinate system;
• acquiring incidence angle information of the sunlight on the horizontal coordinate system by applying a time when the light quantity data is measured, latitude information, and longitude information to a sun path equation;
• confirming the horizontal coordinate system by calculating a true north direction (Y-axis direction) on the horizontal coordinate system through the horizontal plane (X-Y plane), the incidence vector, and the incidence angle information of the sunlight on the horizontal coordinate system;
• and
• calculating three-dimensional slope information including a tilt angle, an azimuth angle, and a roll angle of the antenna on the horizontal coordinate system by comparing the confirmed horizontal coordinate system with the local coordinate system,
• wherein in the calculating of the three-dimensional slope information, the roll angle of the antenna is corrected to be 0°, and then the tilt angle and the azimuth angle of the antenna on the horizontal coordinate system are calculated.