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PLUS System Manual System Installation 51
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TDOA statistics are displayed in nanoseconds. The most significant results in the TDOA Statistics
window are the Peak-Peak and Max Peak-Peak columns. The Peak-Peak column shows the peak
variation in the TDOA value over the last 1024 values. The Max Peak-Peak column shows the
maximum TDOA variation seen since the statistics were reset. Optimum positioning performance will be
achieved when the Peak-Peak TDOA values for a given Tag are in the range of 1 nanosecond or less.
2.6.4 Position Statistics
To observe position statistics for a given Tag, first enable the Display Trails option under the View
menu. Next, open the Position Statistics window by selecting Position Stats under the View menu.
Click the Reset Stats button, and allow the statistics to accumulate. The average X and Y calculated
coordinate values are shown, as well as the standard deviation for the last 1024 values and Maximum
standard deviation from the time statistics were reset. The average Z result will be the value entered
in the Tag configuration.
Figure 2-48: Position Statistics
2.6.5 Filtering
The signal from a Tag in a dynamic environment is sometimes subject to blockage and multipath,
causing an erroneous position result. Speed Limit Filtering can be used to condition the position
results such that the position from one update to the next cannot exceed a specified rate of motion.
Averaging Filtering can also be used to average a given number of positions to smooth the position
estimate. To set the filter parameters, select Filter Settings… under the Settings menu.
Figure 2-49: Filter Settings
Speed Limit Filtering
To disable the Speed Limit Filter, enter a value of 0 for Speed limit.
To enable the Speed Limit Filter, enter a value of 1.5 meters/second for normal walking speed. You
may wish to experiment with different filter settings for Tags moving at different rates.
Averaging Filtering