SYMEO Local Positioning Radar System
Product Family LPR
®
-1DHP-200 – Product Documentation
Device Setup via the Web User Interface
Copyright © Symeo GmbH 2018
DOC.EDO.000341.WORK.EN_LPR-1DHP-200_Product-Documentation.docx
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Signal Strength Statistics
Figure 8.28: Diagnostics - RSSI over distance diagram
This diagram shows the recorded distance-signal strength pairs since the last power-on. You
can use it to detect abnormal signal propagation routes at certain constellations of the two
LPR
®
stations, as the signal strength should decrease with increasing distance.
The diagram is automatically refreshed every 10 seconds.
The distance axis displays the distance between the two LPR
®
stations, and the RSSI axis
the received signal strength in dB. As the signal strength at specific distances may vary, the
statistical distribution of the signal strength is also recorded. Displayed are the mean
received signal strength, the 10 % quantile and the 90 % quantile. The quantiles give you
information about how many recorded signal strength values were lower than the
corresponding line. 10 % of the recorded signal strengths were lower than the 10 % quantile
line and 90 % were lower than the 90 % quantile line, leaving 80 % in between those two
lines. This way you get an idea of the signal strength distribution per distance without
including extreme outliers. This helps identifying distances with increased signal distortions
(e.g. due to multipath signal propagation), as the variance of the signal strength there usually
increases.
