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3.4. DETECTION ALGORITHM
Below is a simplified flowchart for the ID5002P detection algorithm which is running while
LISTENING.
Calculate Average Noise (AN)
over Average Noise Time
(AVT) period in minutes
Clear
"PIG APPROACH"
The image to the right shows what a
typical pig passage will look like
while
in
live
display
section 3.5.8 SYSTEM MENU 2 – LIVE
DISPLAY).
ID5002P MANUAL RevA01
Periodically calculate 100 bin FFT
(200Hz per bin)
Calculate Power In Band (PIB) between Lower
Frequency bin (LF) and Upper Frequency bin (UF)
Calculate Difference Level (DL)
= Average Value (AV) – Average Noise (AN)
"PIG APPROACH"
NO
Was DL > HL for
longer than DT?
PIG DETECTED
Y-SCALE
mode
(see
Calculate Average Value (AV)
over Average Value Time
(AVT) period in seconds
NO
DL > HL?
YES
Display
NO
DL < LL?
YES
YES
1 0 0 0
G A I N
AMP
1 0 3
GAIN
DT
HL
LL
DL
Page 8 of 21
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