How is accelerometer and gyroscope noise calculated from datasheet of MPU9250 in the below example?

Question

Rakhi Agarwal 2019-9-6

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https://ww2.mathworks.cn/matlabcentral/answers/479168-how-is-accelerometer-and-gyroscope-noise-calculated-from-datasheet-of-mpu9250-in-the-below-example

评论： saikat mondal 2023-11-17

So I found this very useful link to implement MPU9250 with arduino:

https://www.mathworks.com/help/supportpkg/arduinoio/examples/estimate-orientation-inertial-sensor-fusion-and-mpu-9250.html

However, I have doubts regarding how the accelerometer and gyroscope noise calculated from the datasheet (as mentioned in the link).

If anyone knows how these values are calculated, kindly explain.

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Answer 1

Pujitha Narra 2019-9-9

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https://ww2.mathworks.cn/matlabcentral/answers/479168-how-is-accelerometer-and-gyroscope-noise-calculated-from-datasheet-of-mpu9250-in-the-below-example#answer_390968

Hi Rakhi,

The accelerometer and gyroscope values given in the datasheet for MPU-9250 are rms values. The GyroscopeNoiseMPU9250 and AccelerometerNoiseMPU9250 are calculated as follows:

RMS Noise of Gyroscope= 0.1⁰/s-rms

=0.00174533 rad/s-rms

Deviation of Noise=

=3.0462e-06 rad/s= GyroscopeNoiseMPU9250

Similarly,

RMS noise of Accelerometer = 8 mg-rms

=8e-3*9.8 meter/

-rms

= 0.0784 meter/

-rms

Deviation of Noise =

= 0.0061 meter/

= AccelerometerNoiseMPU9250

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Daniel Schwartz 2020-12-2

Wouldn't squaring the RMS noise give you the variance rather than the deviation?

saikat mondal 2023-11-17

can you tell for magnetometer as well.

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Answer 2

fatima zohra soussi 2020-8-12

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https://ww2.mathworks.cn/matlabcentral/answers/479168-how-is-accelerometer-and-gyroscope-noise-calculated-from-datasheet-of-mpu9250-in-the-below-example#answer_478887

编辑：fatima zohra soussi 2020-8-12

can you give me this model please because i also want to simulate gyroscope/Accelerometer in simulink , the link is not work thank you

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Diarmaid Cualain 2020-9-16

I assume that they are referencing here: https://uk.mathworks.com/help/supportpkg/arduinoio/ug/estimating-orientation-using-inertial-sensor-fusion-and-mpu9250.html

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