Note: I posted this over on Robotics but the more I think about it, the more I realize this would be better asked here.
Basically, I want to detect an ultrasonic beacon in a radius around the robot. The beacon would have a separate ultrasonic emitter while the robot would have the spinning receiver.
Are there any existing ultrasonic sensors that would meet this use case or am I stuck hacking one together myself? I have tried searching Google, but I assume the keywords I am using aren't the industry standard ones.
Is ultrasonic even the best choice? I was hoping that the beacon would be kept in a pocket, so I figured optical sensors were out. However, the beacon could be attached outside of clothing.
Edit: I should add that both the beacon and the robot will be mobile, so stationary base station solutions are not what I am looking for.
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