Information provided herein is considered accurate however is not guaranteed. Memsense reserves the right to change specifications at any time, without notice.
Document Number
DOC00290
Document Revision
J
Page 4
3.2
Coordinate System
The coordinate system for the IMU follows the right hand rule convention. The sign convention for the
accelerometers is configured to produce a positive signal when the IMU is accelerated in the opposite
direction of the axis arrow. As an example, the IMU pictured in Figure 2 below (given the X and Y axis are
parallel to the earth’s surface) will produce 0
gs
for the X and Y axes and a positive 1
g
for the Z-axis. As
a further example, if the IMU were moved forward (left side of the page) the X-axis accelerometer would
produce a positive output. A counterclockwise rotation of the IMU about any of the depicted axis will
produce a positive angular rate output for the corresponding axis.
Figure 2 – Nano IMU coordinate system, side view