I'm trying to understand how noise is represented for accelerometers, gyroscopes, and magnetometers so that I can match the requirements of my project with the standard specs of these sensors.
I want the output of a 3 axis inertial sensor to be values in meters/sec/sec, gauss, and radians/sec for each axis, and noise to be represented by a range around the true value (so X as in +/- X m/s/s, gauss, and radians/sec) for accelerometers, magnetometers, and gyroscopes respectively. Switching out gauss for teslas, meters for feet, radians for degrees, etc. would all be fine.
After looking at a few datasheets, I'm surprised to find that...
- Accelerometer noise is measured in "LSB rms" and "μg/√Hz"(https://www.sparkfun.com/datasheets/Sensors/Accelerometer/ADXL345.pdf, http://dlnmh9ip6v2uc.cloudfront.net/datasheets/Sensors/Accelerometers/MMA8452Q.pdf)
- Gyroscope noise is measured in "º/s-rms" and "º/s/√Hz" (https://www.sparkfun.com/datasheets/Sensors/Gyro/PS-ITG-3200-00-01.4.pdf)
- Magnetometer noise is measured in "µT rms" and "Gauss/√Hz" (http://dlnmh9ip6v2uc.cloudfront.net/datasheets/Sensors/Magneto/MAG3110.pdf, http://www.vectornav.com/products/vn200-rug?id=54)
What do these units mean, and how do they (or can they) translate into what I want?