Technical Manual

Technical Manual
ARGUS AM Floor System
Cross Point Device Explorer v1.2 Page 45 of 65
Signals received by the ARGUS AM Floor System are processed based on the phase and
anti-phase principle. This way it is better possible to distinguish between valid tag/labels
signals and random noise signals. The settings related to this can be individually set for the
phase and anti-phase mode, making it possible to obtain maximum sensitivity in anti-phase
mode when, for example, more noise is present in phase mode or vice versa.
The threshold level can be adjusted in two ways; automatically or manually
Automatic threshold level adjustment
Tick the Automatic threshold checkbox to activate automatic threshold level adjustment.
Depending on the environmental noise levels, the system will automatically and
continuously adjust its threshold level higher than the noise levels.
In automatic threshold mode, the following settings are available:
• Minimum threshold – the automatic threshold level will never go below the
specified minimum threshold value. Use this setting to make sure the system will
not get too sensitive, creating potential false alarms, when noise levels are very
low. Default value is 10.
• Threshold degrees – This setting is used to set the accepted angle of the
detected signal. A detected tag/label signal has a more or less stable angle, where
the angle of noise signals vary, which makes it possible to distinguish between a
valid tag/label signal and noise signals. When the PHASE bar, located underneath
the scope view image, shows a lot of valid (red) signal without the presence of a
tag in the vicinity of the antennas, it is advised to reduce the threshold degrees
value. The best setting is when there is only an occasional grey signal visible in the
PHASE bar.
Threshold degrees value too high
Threshold degrees value OK
Default value is 10. It is not advised to use a lower value, because valid tag/label
signals can then be discarded and will not trigger the alarm.
• Sigma – This setting represents the distance that is automatically kept between
the noise level and the threshold level. A lower value will increase the sensitivity
by keeping less distance between the noise and threshold level, making the
system also more vulnerable for false alarms. A higher value decreases the
sensitivity, while making the system less vulnerable for false alarms. The default
value is 30 and should be sufficient for most situations.
Manual threshold level adjustment
Un-tick the Automatic threshold checkbox to activate manual threshold level adjustment.
In the manual threshold mode, the software will not automatically adjust the threshold level
anymore, so a sudden increase of noise might result in false alarms.
In manual threshold mode, the following settings are available:
• Threshold degrees - See explanation under Automatic threshold mode.
• Threshold - This setting is the actual manual threshold setting that can be
changed by typing a value in the input field, clicking the up/down arrows in the
input field or by dragging and dropping the manual threshold slider next to the
scope view image. Remember that a high value makes the system less sensitive
for detection of tags/labels. A low value makes the system more sensitive for
detection of tags/labels, but also increases the chances on false alarms. Therefor
the automatic threshold setting is for most situations the advised setting.