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4.4. DETECTION ALGORITHM
Below is a simplified flowchart for the ID5001P detection algorithm which is running while the
unit is in LISTENING mode.
Calculate Average Noise (AN)
over Average Noise Time (ANT)
Clear
"PIG APPROACH"
ID5001P_5001_B00
Periodically calculate 100 bin FFT
Calculate Power In Band (PIB) between Lower
Frequency bin (LF) and Upper Frequency bin (UF)
period in minutes
Calculate Difference Level (DL)
= Average Value (AV) – Average Noise (AN)
NO
(200Hz per bin)
Calculate Average Value (AV)
over Average Value Time (AVT)
period in seconds
NO
DL > HT?
YES
Display
"PIG APPROACH"
NO
DL < LT?
YES
Was DL > HT for
longer than DT?
YES
PIG DETECTED
Page 8 of 36
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