Distance sensors suggestions

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hi all

ive got project im working on , need sensor detect distance of user +- 6 meters accuracy of 500cm.

it outdoor application , user , device moving about.

i have looked rf doesnt seem plausible , bluetooth(not sure that), have looked ultrasonic sensors need receiver or sender on user has timing issues , need rf modules send data etc unless guys know of ultrasonic sensors work receiver on device , sender on user communication between two?

please there has simple out there , cheap lol.

thanks or pointers chaps.

well, there ultrasonic distance sensors arduino... don't think each 1 has own frequency, suppose 1 can receive others signal. wiring arduino output ping input of 1 while listening echo of other *might* work. sync 2 duinos on few orders of magnitude faster, such rf, or connect wires , sync once , measure ping... being said, need ball of transducers , receivers. :d



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