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I have a reference device that outputs euler angles, which are angles that relate the sensor body frame to the north east down frame. These angles are called pitch roll and yaw. The sensor is an accelerometer. I know how to get the rotation matrix that will put accelerations from the accelerometer sensor body frame to the north east down frame. Call this rotation matrix R(Body to North East Down).

How do I get the rotation matrix that will rotate from Body frame to Earth Centered Earth Fixed frame? I need to do this as all of my other calculations use the Earth Centered Earth Fixed frame. I can see that:

R(Body to Earth Centred Earth Fixed) = R(Body to North East Down) * R(North East Down frame to Earth Centered Earth Fixed).

How do I get R(North East Down frame to Earth Centered Earth Fixed)?

To get acceleration in the Earth centered Earth fixed frame, would I use:

Acceleration(Earth Centred Earth Fixed) = R(Body to Earth Centred Earth Fixed)*Acceleration(Body frame) ?

I have access to the position in latitude and longitude (radians). Also note that acceleration is a vector not a coordinate.

Thanks.