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CODELOG MODE CONFIGURABLE PARAMETERS (continued)
Filters to define pass/fail boundaries based on selected characteristics of
pulsed transmissions include:
Echo Filter
allows a time period entry (in ms) following a valid detection, where
any additional pulses within the specified period would be identified as
signal echoes and ignored. The default value is appropriate for most
applications.
Noise Threshold
allows a minimum allowable detection signal strength value to
be defined (to a maximum of 99). The value selected will depend on local
ambient noise conditions at the study. Applying a noise threshold value
reduces logging ‘noise events’ so
improves receiver efficiency insofar as
power, memory and processing time and can reduce data download and
sorting time during post processing as fewer noise events will be logged.
As the noise threshold adjusts the noise floor for acceptable detections,
valid but weak detections at the boundary of reception may be lost
depending on the value selected.
Pulse Width
is defined through the SRX Host, and minimum Pulse Width filter
threshold is typically set to 2ms. With the filter enabled, pulses with a
measured pulse width less than the pulse width filter (e.g. 2ms) are
ignored.
Enable or disable this feature via:
Codelog > 1)Config > 5)Filters > 2)Pulse Filter > 3)Pulse Width > 1)Enable
(or)
2)Disable
The display shows the current setting in brackets using the number of the
menu items available. For example, if pulse width filter is disabled, then
the number in brackets is “
2”
.
Signal Strength Deviation
applies to codes (sequences of pulses), and is used to
reject codes whose individual pulses exhibit a large variance. This feature
is useful for detecting code collisions, where two codes with different
signal strengths have overlapped.
The maximum signal strength deviation is 18. Enable or disable this
feature via:
Codelog > 1)Config > 5)Filters > 2)Pulse Filter > 4)Signal Strength Dev > 1)Enable
(or)
2)Disable
