A drone might fly into a semi-dark structure the ... which could be affixed to a wall like a sticker, it would be cheaper and easier to implement than systems that require multiple tags.

The Matrice drone, weighing less than a pound, is fitted with a camera, thermal heat detector, loudspeaker and a spotlight, ...

MiFly differs from this norm by depending on just one compact tag that can be affixed to any surface, like a sticker on a wall. This tag reflects signals back to the drone in the form of ...