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Need to build a cheap tracking device

Need to build a cheap tracking device

Need to build a cheap tracking device

(OP)
I need a cheap tracking device to be installed on a robot.

The robot(with the receiver) needs to follow a man (wearing the transmitter). The range of transmission is within 50m, the range of tracking error within 3m. Preferrably no GPS is used.

Eg. a robot carrying my tool box need to follow behind me to where I walk to in a room. And the robot has to be within 3m around me.

Does anyone got any good suggestion for the receiver and transmitter? Or how I should go about implementing such a tracking device.

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