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Daniel Dyer replied to Dave_fr's discussion 'Virtual compass for ardupilot = even faster and pinpoint navigation ???'

Actually, the Ublox doesn't interpolate its measurements - when you ask for the maximum of 4 updates per seconds, it is actually solving at 4Hz. The way it gets accurate heading is actually from the velocity, which is calculated using from the…

Aug 24, 2009

Daniel Dyer commented on Roy Brewer's blog post 'Accelerometer question for IMU Experts'

Roy, You're certainly correct in that in the unbalanced force case (when the vehicle is still accelerating and drag forces are negligible), the accelerometer will measure an acceleration along the body-z axis of a magnitude (g / cos(theta)).…

Aug 9, 2009

Daniel Dyer commented on William Premerlani's blog post 'EM406 dynamics: final resolution'

Yep - I can confirm the U-Blox LEA-5H actually solves at up to 4Hz. The solution rate can be set independently to the reporting rate, and dead reckoning (interpolation) can be disabled if required. I'm using it on a board which I've…

Apr 27, 2009