Re: Open Source AHRS project: giving away hardware

2014-05-11 Thread Jake
On 05/11/2014 07:08 AM, joerg Reisenweber wrote: On Sat 10 May 2014 11:57:30 Pascal Gosselin wrote: calibrate the compass via GPS track by an easy calibration or self-calibration method GPS doesn't offer any data to calibrate magnetometer from. magnetometer aka compass is about orientation

Re: Open Source AHRS project: giving away hardware

2014-05-11 Thread Pascal Gosselin
Indeed. When you taxi an airplane on the ground in a straight live or drive a car in a straight line, GPS TRACK (adjusted for magnetic declination) = Magnetic Heading. The other complementary magnetometer calibration techniques involve driving around in a full circle in about 60 to 75 seconds

Re: Open Source AHRS project: giving away hardware

2014-05-11 Thread Pascal Gosselin
On May 11, 2014, at 12:03 AM, Ben Wong lists.openmoko@wongs.net wrote: Sounds like a fun challenge. I'd take it up if I wasn't already so busy. After all, who in their life hasn't at one point wanted to write an Unscented Kalman Filter? ;-) Just out of curiosity, is OpenPilot.org

Re: Open Source AHRS project: giving away hardware

2014-05-11 Thread joerg Reisenweber
On Sun 11 May 2014 09:25:37 Pascal Gosselin wrote: Indeed. When you taxi an airplane on the ground in a straight live or drive a car in a straight line, GPS TRACK (adjusted for magnetic declination) = Magnetic Heading. The other complementary magnetometer calibration techniques involve

Re: Open Source AHRS project: giving away hardware

2014-05-11 Thread Pascal Gosselin
On 2014-05-11, 11:28 AM, joerg Reisenweber wrote: This all assumes a locked and defined mounting situation for the magnetometer. Then yes. For an embedded device however this method tells you nothing about the magnetometer heading. The embedded device can change relative orientation to the

Re: Open Source AHRS project: giving away hardware

2014-05-10 Thread Ben Wong
Sounds like a fun challenge. I'd take it up if I wasn't already so busy. After all, who in their life hasn't at one point wanted to write an Unscented Kalman Filter? ;-) Just out of curiosity, is OpenPilot.org not a viable solution? --Ben On Sat, May 10, 2014 at 8:57 AM, Pascal Gosselin

Re: Open Source AHRS project: giving away hardware

2014-05-10 Thread joerg Reisenweber
On Sat 10 May 2014 11:57:30 Pascal Gosselin wrote: calibrate the compass via GPS track by an easy calibration or self-calibration method GPS doesn't offer any data to calibrate magnetometer from. magnetometer aka compass is about orientation of device, GPS is about position and movement