Tilt using accelerometers

[raybuzz]

Hi everyone,
I am a newbie in building of UAVs. I am trying to build an autopilot from scratch. I read about accelerometers used to measure tilt, but this is possible when the aircraft moves at constant velocity or is at rest. But most of the time the aircraft will be accelerating in 3D space, so how is accelerometers used to measure tilt on an UAV?

[zlite]

Hi everyone,
I am a newbie in building of UAVs. I am trying to build an autopilot from scratch. I read about accelerometers used to measure tilt, but this is possible when the aircraft moves at constant velocity or is at rest. But most of the time the aircraft will be accelerating in 3D space, so how is accelerometers used to measure tilt on an UAV?

You combine 3-axis accelerometers (noisy in short term) with 3-axes gyros (drifting over long term), correcting each other, to create a full IMU. Google IMU and Kalman Filter and you'll see how.