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What is the resolution of sensor data inside DMU30?

24-bit sigma delta analogue to digital convertors are used within DMU30. Compensation is carried out using single precision floating point mathematics. The DMU30 output message is also output as single precision floating point numbers. So the mathematical resolution is very small indeed.

In practical terms, the minimum resolvable change is dominated by the sensor noise. With averaging, this can be improved to a point where the minimum resolvable change is dictated by the bias instability derived from Allan Deviation plots. For the gyro channels this is below 0.1 deg/hr and for the accelerometers, around 10μg.

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