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What magnetometers are out there?

Discussion in 'Electronic Design' started by Mike, Mar 27, 2007.

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  1. Mike

    Mike Guest

    Hi - I'm working on building a fairly sophisticated IMU system. It
    will combine data coming from 3 axes of gyro, 3 axes of accelerometer,
    3 axes of magnetometer, and a DGPS corrected GPS into an XYZ offset
    and roll pitch yaw offset from initial conditions.

    Anyways - right now I'm trying to identify what sort of magnetometer
    to use. I care most about accuracy, precision, and bandwidth. Right
    now I'm thinking I'll use some Honeywell parts:
    http://www.ssec.honeywell.com/magnetic/products.html - probably the
    HMC1053: http://www.ssec.honeywell.com/magnetic/datasheets/HMC105X.pdf

    Good linearity (.1%), high bandwidth (5MHz), small size (LCC-16
    (essentially a QFN without a ground pad)), annoying interface (lots of
    external parts needed - including high voltage stuff - a complete pain
    to work with).

    One thing I worry about a bit - Honeywell also has some parts with 3x
    the sensitivity of the HMC1053, but in unappealing packages (and only
    single or dual axes). Will I lose any accuracy by having to set my
    gain 3x as high on whatever instrumentation amp. I use? From my
    understanding typically the non-linearity of instrumentation amps is
    in the hundreths or thousandths of a percent, so it won't matter at
    all.

    PNI make some sensors that seem to be more bandwidth limited. Various
    other companies make magnetometers with somewhat slow digital
    interfaces, whereas I'm looking for an analog interface. I would like
    about 1KHz bandwidth or more.

    Any other parts I should be looking at?

    Thanks!

    -Mike
     
  2. linnix

    linnix Guest

    We are working on
    Absolute position to 10cm.

    Both requires MicroElectroMechanicalSystem (MEMS) fabrication parts.
    We just need to find the right company to do it for us.
     
  3. Mike

    Mike Guest

    Why would you need MEMS for GPS? What's mechanical about GPS?

    Also, relying entirely on accelerometers and GPS will certainly limit
    you to where your device can be used. I'm not sure what market such a
    device would appeal to - needing a nearby DGPS station as well as a
    good satellite signal. What market are you aiming at?

    -Mike
     
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