Wavecom W-SPECTRA (Automatic Monitoring System) V1.1.0 - Manual (Page 210)

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Classifier – the Brain of W-SPECTRA WAVECOM Monitoring System W-SPECTRA, W-SPEED Manual V1.1.0
Classifier
– the Brain of W-
SPECTRA
Overview
To work in its full automatic functionalities W-SPECTRA has an integrated signal classifier. There are two
different variants of classifier:
 A wideband (up to 96 kHz) version (Classifier-WB) is available with the license code 101. The
wideband classifier is suitable to automatically process all signals in HF, VHF/UHF and SAT bands.
 A narrowband (up to 8 kHz) version (Classifier-NB) is available with the license code 201. The nar-
rowband classifier is suitable to automatically process HF signals only.
The wideband classifier covers all functions of the narrowband classifier. When there are both wideband
and narrowband classifier licenses programmed on the CMStick, the wideband classifier is used by a W-
SPECTRA. The narrowband classifier license can be used by another W-SPECTRA in the same local area
network (LAN), when it does not carry a classifier license itself.
Classifier
The classifier is an important analysis tool for the classification of unknown signals. Its purpose is to au-
tomatically determine the modulation type, baud rate, frequency shift and bandwidth of one or more sig-
nals within the classification bandwidth. The wideband classifier will attempt to classify all signals within a
bandwidth of up to 96 kHz depending on settings.
The classifier, together with the code check, forms the brain of W-SPECTRA and delivers the intelligence of
the whole monitoring system.
How the Classifier Works
Signal classification is done by providing the classifier with a complex sample (IQ) stream of the input sig-
nal across the chosen signal bandwidth, for a chosen period of sampling time and at a certain sampling
rate. These sample series are examined for the properties of the signals contained within it. The results of
the classification are output as a list of classified signal parameters.
Two classification modes are provided: A manual mode and a continuous mode. In manual mode the clas-
sifier will make one attempt at classification. In continuous mode, the classifier cyclically classifies signals
with a user selectable interval. By default W-SPECTRA runs a classifier in continuous mode.
Depending on the complexity of the signals and the selected classification bandwidth, after a few seconds
the classification results are listed in the results window.