Posted on December 21, 2013 at 21:50Hi,
i'm a german student and i'm working on a private project. It's a UAV (UnmannedAirVehicle), which controls it's altitude by pressure. For this, i want to use a LPS331AP, but the raw-data output oscilates with a frequency of about 0.05 Hz. Normally, i would use a bandstop filter to reduce / minimize this noise, but if the UAV moves up or down, the frequency can be / will be often the same, so this doesn't fit.
In the application note ''Hardware and software guidlines'' it says on page 16:
''
For indoor navigation when sub meter detection is required, a special recursive filter could
be used. Tailoring the S/W filter for the sensor characteristic and the application requirement
is usually a good move. Sensor fusion is the most advanced filtering which uses all available
information and uses them to reduce the positioning noise.
''
But i can't find any more information about this ''recursive filter''. What sort if filter should this be? I'm allready using sensor fusion -> i double integrate a accelerometer to get the height out of it and use a complementary filter to combine this with the LPS331AP readings. But the noise frequency of the LPS331AP is too low to determine it.
I don't need to know the absolute pressure.
Thanks for reading & sorry for my bad english
#filter #lps331ap #noise
