Methods, apparatuses and computer program products for calibration of antenna array

A method, comprising:

• displaying instructions for orienting a device such that an image of a calibration source through a camera of the device falls in a designated position on a screen of said device;
• receiving a signal from said calibration source via an antenna array of the device;
• calculating an orientation angle between said device and said calibration source based on said image of the calibration source;
• storing pairs of the signal and the orientation angle at various instances while moving or rotating the device to make the image of the calibration source move along a predefined trajectory displayed on the screen;
• and
• calibrating a direction-finding system in the device based on the stored pairs of the signal and the orientation angle.

An apparatus, comprising:

• at least one processor;
• and
• at least one memory including computer program code,
• wherein the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to:
• display instructions for orienting a device such that an image of a calibration source through a camera of the device falls in a designated position on a screen of said device;
• receive a signal from said calibration source via an antenna array of the device;
• calculate an orientation angle between said device and said calibration source based on said image of the calibration source;
• store pairs of the signal and the orientation angle at various instances while moving or rotating the device to make the image of the calibration source move along a predefined trajectory displayed on the screen;
• and
• calibrate a direction-finding system in the device based on the stored pairs of the signal and the orientation angle.

A non-transitory computer readable medium with computer program code stored thereon, the computer program code causing an apparatus to perform the following when executed by a processor:

• displaying instructions for orienting a device such that an image of a calibration source through a camera of the device falls in a designated position on a screen of said device;
• receiving a signal from said calibration source via an antenna array of the device;
• calculating an orientation angle between said device and said calibration source based on said image of the calibration source;
• storing pairs of the signal and the orientation angle at various instances while moving or rotating the device to make the image of the calibration source move along a predefined trajectory displayed on the screen;
• and
• calibrating a direction-finding system in the device based on the stored pairs of the signal and the orientation angle.