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General compass calibration - 3 AXIS HALL SENSOR

Discussion in 'Phantom 2 Discussion' started by Ottoni, Dec 18, 2013.

  1. Ottoni

    Joined:
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    Location:
    Brazil - Sao Paulo
    Hi folks

    Some information about general compass calibration and how electronic compass works :

    Very interesting text about electronic compass and I think DJI guys should know about this. :idea:
    It would be a good solution for this irritating problem on Phantom copters
    (Source: http://www.akm.com/akm/en/product/detail/0001/

    A pedestrian navigation system can not be developed simply by combining GPS and an Electronic Compass.
    There are several issues which needs to be considered when implementing an Electronic Compass and to measure the geomagnetic field. For example, in portable devices, the extraneous magnetic fields are strong and subject to frequent change and distortion.Furthermore, the levels of component magnetization may change in the strong magnetic fields often encountered around trains, stereo speakers, and other electrical equipment.
    To address this issue, AKM offers the DOE (Dynamic Offset Estimation) algorithm which enables automatic adjustment of the compass for extraneous magnetic field changes, and thus eliminates the need for repeated manual adjustment. (compass dancing).
    The adjustment is automatic, efficient, and highly effective for the maintenance of accurate and reliable direction finding, whether walking along the street, getting off a bus, leaving a subway station, or passing through other environments.

    Link to a Smartphone compass calibration dancing :roll:
    http://www.youtube.com/watch?v=zrEzMggOnFQ
     
  2. slicknet

    Joined:
    Dec 19, 2013
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    Location:
    Southern New England, RI
    Quick question.

    Does the Vision 2 compass need to be calibrated with every use. According to DJi's video, he says the first time you fly it to calibrate.