I'm interested in range finders and was wondering if the arduino ultrasonic range finder could be modified to work at longer range by using two as a radar transponder setup? or perhaps to make an equivalent circuit that acted in the same way.
The current ultrasonic sensor is too weak to pick up the reflected signal it spits out bouncing off objects beyond a certain range but could this be overcome by having a mic and ultrasonic speaker or equivalent on the object itself? The idea being you would send out a sound ping from the ground station which would be picked up by the mic on the object to be tracked, upon being received the device on the object would send out a plast of sound back which would then be picked up by the ground station and the total flight time could then be calculated.
I figured as sound travels a whole lot slower that light or radio waves the whole thing might be a bit more achievable from the perspective of an arduino and it might be able to overcome the ultrasonic range finders short range for certain projects.
Any thoughts appreciated.