I am trying to create a small robot toy car with the ability to follow a person around, with a range of about 50 m.
Ideally the person will be provided with a small transmitter of some kind, and the car will have a receiver which will allow it to determine the direction to the transmitter so that the car can follow the person holding it.
However, I understand that systems such as infrared require line of sight to operate, while others like WiFi are too omnidirectional to pinpoint the transmitter direction.
Is there any recommended method or system that would meet my requirement?
To elaborate, it is more for remote photo taking.
A person would hold a remote tag and trigger a command; after which the robot would seek out the person, and position itself in the same direction to take a shot.
Unfortunately GPS not not a solution as for this application is mostly for indoors. I understand RFID tags may work although i am not sure if it has sufficient directionality