WAVECOM Decoder W74PC, W-PCI/e, W-CODE, W-CLOUD Manual V9.1.0
Analysis Tools
97
The software then proceeds with code and system analysis. The incoming bit stream is tested and com-
pared against known PSK modes.
The name of each identified system is displayed in the output window. An identified system may be imme-
diately started by double-clicking the system in the output window – for instance double-clicking PSK-31
in the figure above will interrupt PSK code checking and immediately start PSK-31.
Hits-Checks
shows how many times a mode was successfully identified during the code check. If multiple
modes are listed, the mode with most hits should be tried first.
Some modes are very difficult to distinguish, especially when the system is in idle mode.
MIL-STANAG Code Check
The MIL/STANAG code check analysis tool is used to determine whether a signal is one of the following
MIL/STANAG and related transmission modes:
HF-ACARS
MIL-188-110A
MIL-188-110B
MIL-188-141B
STANAG-4285
STANAG-4529
STANAG-4415 is a sub-mode of MIL-188-110A and is detected as this mode. STANAG-4481 is a sub-mode
of STANAG-4285 and is detected as this mode.
This analysis feature can be started from the
HF-Modes | Analysis | MIL-STANAG Code Check
menu,
from the
Analysis
Selector.
The center frequency can be set by the user. The default value for the code check is 1800 Hz, as shown in
the user interface. The center frequency of HF-ACARS (1440 Hz) can be selected from a list. After the cen-
ter frequency is set, the code check searches for the mode within a range of ± 100 Hz of the center fre-
quency. Although HF-ACARS may have a center frequency of 1440 Hz, it can also be detected when the
code check is set with center 1800 Hz.
