User Manual Part 2

IS-900 User Guide Page 90 of 159
Figure 38 - Communication Integrity Status for a Wired Tracking Station 1
The statistical values for “TQ” or tracking quality (shown in Figure 39) are represented by a
percentage from 0 to 100%. 100% means that the station is tracking perfectly and 0% means it is
lost. When an InertiaCube is plugged into a station port, the tracking quality is always 100%
because no ultrasonic measurements are used by 3-DOF devices such as InertiaCubes. For
MicroTrax devices, values anywhere in the range are possible.
This statistic is also available in the output data record item #75 indicating communication
integrity for a station. It ranges from 0 to 100, the same as the LCD value.
Figure 39 - Tracking Quality Status for a Wired Tracking Station 1
With MicroTrax devices, the number of measurements a station receives and the size of the
range errors of each measurement determine tracking quality. A station that receives a
measurement at each microphone in almost every measurement cycle, with an average range
error of less than 1 mm, will indicate 100%. The quality can drop to 0 if the station stops
receiving measurements or range errors get larger than 2 cm. Brisk motions or shock can also
temporarily reduce quality. It is typical to see a figure of 90% or higher for a motionless station
under good conditions with a well-calibrated Constellation. Loss of data from poor
communication integrity will also reduce the tracking quality.
This statistic is also available in the output data record item #40 indicating tracking status for a
station. In this data record, the value is 255 x TQ% (a range of 0 to 255).