Re: [Paparazzi-devel] Use magnetometer or not for an airplane?

[Chris]

Hi Heinrich
I found the problem.
I was setting the "mag_valid" variable and this triggers the 
magnetometer code to scale the values and pass them to the imu structure 
despite the "USE_MAGNETOMETER" DEFINITION.
I also wrote another pice of code in order to calibrate and use the 
magnetometer as a simple compass
so i can direct the airborne antenna using the magnetometer rather than 
the "gps_course"
What i do is first detect the wind direction with the pitot tube, then 
fly in to the wind and record the
gps_course and MAG_Heading measurements and finally calculate the 
difference and adjust the
MAG_Heading measurement accordingly so both measurements are equal (with 
normalization of course).
This way MAG_Heading - gps_course = real_yaw (i think :-)  )
I am thinking a similar calibration on the ground so i can avoid the 
airborne calibration.
DO you think that this method is correct in general?
Chris


On 06/02/2013 07:00 PM, address@hidden wrote:
> Use magnetometer or not for an airplane?