User Manual

106 Visualizer PLUS System Manual
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 Show TDOA Messages – Display, in the Message View Frame, the TDOA messages output by the
PLUS location engine
 TDOA Stats – Display the TDOA Statistics dialog. You can use this dialog to view statistical data
about the TDOA messages received for each unique Reader pair, including the number received,
average, standard deviation, maximum and minimum TDOA value, and peak-to-peak values. Note
the statistics can be sorted by clicking the column header on which to sort. The data can be sorted
by Reader Pair, Num TDOAs, Std Dev, Peak-Peak (ns), Max Peak-Peak (ns), or Max Std Dev. The
number of samples for a Reader pair is shown in the Num TDOAs column.
Figure 5-8: TDOA Statistics Dialog
TDOA Statistics
o Select tag – Select the Tag for the TDOA statistics to view
o Reset Stats – Select this button to reset the TDOA statistics for the selected Tag
o Filter by Reader – Reduce the amount of data presented by selecting a Reader to filter by.
Statistics by Reader Pair
The following is a list of the statistical fields and their meaning.
These statistics are computed using the last number of TDOA messages (Num TDOAs) received for a
given Reader pair, up to 1024 samples. Num TDOAs is shown in the second column of the form.
o Reader Pair – The Reader pair for which the statistics apply
o Num TDOAs – Number of TDOA messages used in computing the statistics for that
Reader pair
o Last TDOA – Last TDOA value, in nanoseconds (ns), received in a TDOA message for the
given Reader pair
o Avg – Average of the TDOA values received for the given Reader pair
o Std Dev – Standard deviation of the TDOA values received for the given Reader pair
ID of Tag for which the TDOA statistics apply