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High precision radio positioning system for metrology

Discussion in 'General Electronics' started by George, May 19, 2004.

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  1. George

    George Guest

    Hello everybody,

    I'm trying to create a high precision positioning system using a
    triangulation method similar to GPS but on a local level. I think
    that by calculaing the distance between a receiver and several
    (atleast 4) transmiters I can precisely know where de receiver is in
    the room.

    I hope that a simple phase comarison whould be enough to calculate
    the distance between rx and the tx's.

    The problem is that I have know idea what sort of wave i should
    use: advantages and disadvantages of low/high frequencies. I'm afraid
    that I might have problems with multipth effects and electromagnetique
    noise created by other electrical devices in the room. I'm also
    worried about where exactly the transmission and emission points are
    on the antennas since I want highly accurate results.

    If anyone has an idea or suggestion I would highly appreciate any
  2. Art

    Art Guest

    Got a major project on your hands there, Gov. Like trying to re-envent the
    mouse-trap. You must start at the absolute basics and determine exactly what
    your requirements are, and then determine what means will be most effecient
    and accurate to produce usable data. You may find the GPS may be less
    expensive unless you definately want to engineer something. Suggest
    searching the local libraries for good engineering manuals and go fo it.
  3. I'm wondering, does it have to be rf? And are you using fixed receivers
    or fixed transmitters? A "beacon" that gives out pulses of ultrasonic
    sound in sync with a pulse from an infrared led would allow simple time
    measurement circuits to be used.

    The Nintendo Powerglove ('80s vintage) used an ultrasonic transmitter on
    the back of the glove, and a wired link for the sync pulse. The
    receivers were 3 transducers mounted to a fixed framework that provided
    known distances between the receivers.

    Ultrasonic and laser tape measures have pretty good accuracy, and
    repeatability. You might try and see if you can interface into some to
    provide the range measurement system.

    Good Luck!

    R Allen
  4. Mantra

    Mantra Guest

    Dude, you're in over your head. "highly accurate results"?!? Gee,
    how many kilometers/centimeters/micrometers resolution is that?
    Sorry, I'm ranting. I have plenty of ideas for you but without specs
    and/or application it's hard to make an intelligent suggestion.

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