PNI TCM 5 - Manual (Page 24)

PNI Sensor Corporation Doc #1007537 r12
TCM3 & TCM5 User Manual- Sept 2011 Page 24
4.2.3 Pitch and Roll
The TCM uses accelerometers to measure the orientation of the compass with respect to gravity. Since
the compass also measures the complete magnetic field, the TCM can correct for the tilt of the compass
to provide an accurate heading.
The TCM utilizes Euler angles as the method for determining accurate orientation. This method is the
same used in aircraft orientation where the outputs are Heading (Yaw), Pitch and Roll. When using Euler
angles pitch and roll are defined as the angle rotated around an axis through the center of the fuselage;
pitch is rotation around an axis through the center of the wings. These two rotations are independent of
each other since the rotation axes rotate with the plane body.
For the TCM a positive pitch is when the front edge of the board is rotated upward and a positive roll is
when the right edge of the board is rotated downward.
TCM Standard Mounting