3 ms·
So, we first need to find the highest motion frequency a sensor might experience in the experiment, and then make sure the sampling rate it at least twice that
by iamcreasy 3y ago
So, we first need to find the highest motion frequency a sensor might experience in the experiment, and then make sure the sampling rate it at least twice that to avoid aliasing?
Meaning, if an IMU sensor is mounted on a very slow moving, such as 2cm/s, RC vehicle then the sampling rate can be very slow. But if the sensor is on a fast moving drone, we need to estimate the highest frequency of the motion and make sure our sampling rate is at least double that?
- KeplerBoy 3y agoYes, pretty much, but it depends. Your 2 cm/s RC vehicle might still experience high-frequency vibrations (in the range of the motor rpm) and you might want to sample that.
- iamcreasy 3y agoIf we are not trying to capture motor rpm vibration - can't we just ignore it?
- jononor 3y agoWhether it is signal of interest or not, if above the sampling rate it will be aliased down into lower frequencies. So all energy above the sampling rate should be removed to avoid this disturbance.
- iamcreasy 3y agoSo low pass filter is always mandatory? For example, in this RC car case - lets say we are sampling at 1Hz and the signal appears to be clean. But we still have to run a low pass filter of ensure the motor vibrations are removed?