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  1. #1
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    Two scale factors in IMU

    Hi,

    an IMU has two parameters:

    scale factor repeatability = 1000 PPM (1-sigma)
    and
    scale factor in-run stability = 250 PPM (1-sigma)

    Question: What is the difference between them?

    Senmeis

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  2. #2
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    Re: Two scale factors in IMU

    from https://en.wikipedia.org/wiki/Inertial_measurement_unit

    repeatability is getting the same result from doing the same thing - say you use your IMU to fly a plane from dallas to tokyo
    do this several times. the repeatability is a measure of your landing in the same spot each time

    stability is sitting still and getting the same thing - say you park your plane in denver, and leave the IMU running. stability is it saying your still in the same place



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  3. #3
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    Re: Two scale factors in IMU

    I’m not sure if the „scale factor in-run stability“ is related to the case when the IMU stands still. Attached is an example of both parameters. It seems scale factor in-run stability is measured with the roll = 180 degrees.

    Senmeis
    Click image for larger version. 

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