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Precise location sensor

Discussion in 'Electrical Engineering' started by Tman, Sep 22, 2012.

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  1. Tman

    Tman Guest

    Does anyone know of a technology, module, chip that can do precise locationdetermination...

    I need something that can get 4cm (centimeters) or better repeatable (not absolute) location accuracy, in an area approx 100m x 100m (or so)... 1 update per second is fine.

    I am pretty sure that this is beyond the capability of GPS.

    I can envision a "local LORAN-like" solution consisting of: 3 fixed stations, 1 which is a master transmitter, and the other two of which transmit a different frequency, but with a phase-locking arrangement. Then, the sensor would need to sense these 3 frequencies, do a phase difference determination, and then use this to augment a GPS coordinate with a hyperbolic line of transmission.

    Just as a reasonability check, 10degrees of phase at 150MHZ works out to something like 5cm or so. Higher frequencies being even more precise.

    Thanks for any ideas, before I go about building something like this myself!
  2. Guest

    I meant "line of location"...
  3. Rich.

    Rich. Guest

    Doesn't that Roomba self-driving vacuum do that?
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