|
|
|
Classifier Option
Highlights
- Automatic classification of radio data signals.
- Automatic classification and code check (CCC) of radio data signals.
- Extension to the W61PC, W61LAN, and W-CODE WAVECOM decoders.
- Fully integrated into the WAVECOM user and remote interface.
The ability to rapidly identify unknown signals has become
an essential requirement in signal analysis.
The automation of the signal classification process relieves
the operator from manual evaluation, which otherwise requires considerable
skill and experience. The combination of a classifier and a decoder thus
satisfies the requirement for an automatic system that is able to rapidly and
reliably determine the characteristics of radio data transmissions within the
signal spectrum being monitored accurately.
The classification algorithm determines the center
frequency, speed (symbol rate), shift, bandwidth and modulation.
The detection and classification results are displayed in a
list together with all parameters and are fully integrated into the WAVECOM®
user interface.
Display
Spectrum/Sonagram display
In this pane the monitored frequency spectrum is displayed. After
classification has completed the classified signals are indicated in the spectrum display.
Classification
The results of the classification are shown as a list in a second pane. The
following parameters are provided for each classified signal:
- Modulation type
- Center frequency of the signal
- Number of carriers in the case of multi-carrier FSK
- Baud rate in the case of FSK or PSK signal
- Frequency shift in the case of FSK signal
- Bandwidth
Additional information
Additional FSK, MFSK and PSK information on symbol timing and
constellation, baud rate and frequency vs. time is graphically displayed in
a separate window when a classified signal is selected from the list.
| Parameter |
W-CLASSIFIER-NB, W61CL |
W-CLASSIFER-WB |
|
Bandwidth |
4 kHz or 8 kHz |
0.5 kHz, 1 kHz, 2 kHz, 4 kHz,
8 kHz,
12 kHz,
24kHz,
48 kHz or
96 kHz |
|
Sampling interval (Ts) |
1.6 or 3.2 sec |
1.6 or 3.2 sec |
|
CW |
Ts=1.6: 6 to 60 Bd
Ts=3.2: 3 to 60 Bd |
Ts=1.6: 6 to 60 Bd
Ts=3.2: 3 to 60 Bd |
|
FSK |
30 to 3000 Bd, Shift ≤ 3500 Hz |
30…60 kBd, Shift ≤ 30 kHz |
|
FSK-4/F7B |
30 to 300 Bd, Shift ≤ 3500 Hz |
30…300 Bd, Shift ≤ 3500 Hz |
|
MFSK |
4-36 Tones |
4-36 Tones |
|
PSK 2/4 Variant A/B |
30 to 3000 Bd |
30 Bd to 60 kBd |
|
PSK 8/16 Variant A/B |
30 to 3000 Bd |
30 Bd to 60 kBd |
|
CIS-12 |
120 Bd |
120 Bd |
|
OFDM |
25-512 Carriers |
25-512 Carriers |
|
OQPSK |
25 Bd to 2400 Bd |
25 to 30 kBd |
|
Voice (AM/FM/USB) |
No |
Yes |
|
Sub-carrier modulation (AM, FM, SSB) |
No |
Corresponds to the values
for the primary
modulation type |
Classsifier-Code-Check
The Classifier-Code-Check
is a versatile analysis tool for the classification of unknown signals and
the determination of the protocol (mode) in use. The CCC will attempt to
process all signals within the bandwidth of the classifier (NBCL or WBCL).
The CCC processes input signals in
up to four successive steps as shown in the block diagram below. The user
can select how many steps should be involved in the analysis of the
signal(s) under investigation.
The possible signal paths of the CCC
are shown below:
- The classifier attempts to
classify the input signals according to their modulation formats.
-
The table check will check
the signal against the entries of an XML-formatted list.
-
The code check will check
by attempting synchronization.
- Finally the signal may be
forwarded to a decoder for output.
|
|
|
|
|
