User's Manual

InterSense Doc. No. 072-00105-0I07 Rev. 4.2
IS-900 User Guide Page 21 of 177
1.5.2. MicroTrax Head Tracker
Figure 10 - MicroTrax Head Tracker
The MicroTrax Head Trackers (Figure 10) are tracked devices that provide accurate 6-DOF data
needed to give the user a correct visual viewpoint in an immersive visual environment. The
MicroTrax head tracker is suitable for use in both projected (Simulators, CAVE®s, PowerWalls,
etc…) and head worn (HMDs) application where head tracking is required.
The device can be used wired, or wirelessly. When wired, the head tracker connects to the
MicroTrax TTL-RS422 Dongle. When used in a wireless configuration the head tracker connects
to the MicroTrax Wireless Transmitter. The transmitter powers on by pressing the button for ~
3seconds. The unit will auto-off after 10 minutes of no movement to preserve battery power. To
shut the unit off, press and hold the button for 3 seconds.
There are two miniature acoustic receiver microphones integrated into the MicroTrax Head
Tracker. During operation, all miniature microphones are sampling the ultrasonic signals. Each
miniature receiver microphone has a reception cone angle approaching 180°.
The MicroTrax Head Tracker has the receiver microphones placed at a 45° angle off the front of
the device assuring continual tracking with all normal head positions in standard ceiling or wall
mounted Constellation arrays. The head trackers will continue to track during brief (less than 1
minute) occlusion of one of the microphones.