User Manual Part 2

IS-900 User Guide Page 124 of 159
14.7. Constellation Configuration Tool
Constellation Configuration tool is used to configure and manage the Constellation of
SoniDiscs. This is the most important part of tracker configuration, as it has a direct
effect on quality of tracking.
Terminology
IS-900 models contain an ultrasonic subsystem that includes SoniDiscs (Ultrasonic
Transponder Beacons) and Microphones (URMs). To generalize the interface protocol
and configuration tools for these tracker models, InterSense uses the term: PSE -
Position Sensing Element.
A PSE may be Mobile or Fixed. Mobile PSEs are assigned to the stations and their
movements are tracked by the system. Fixed PSEs form a CONSTELLATION that is
used as a reference for tracking. In the case of IS-900 tracking systems, Microphones
are mobile and SoniDiscs are fixed.
General Guidelines
The position of a SoniDisc is defined as the coordinates of the center of the grill covering
the speaker. All values are entered in meters. The coordinates of the SoniDiscs are
entered in a user-defined, locally leveled coordinate frame. The coordinate system is
right-handed with X pointing forward, Y to the right and Z pointing down (see Section
3.1 for details on the InterSense standard coordinate system). Position data for all
stations is computed relative to that coordinate system.