SECTION 4: OSCOR AUTOMATIC OPERATION
79 REI OSC-5000E
2. The alarm LED indicator should change from a flashing mode to a constant
illumination (when the tone is activated) or no illumination (when the tone is not
activated).
Passive Correlation
In the Passive Mode of correlation, the OSCOR is completely covert and relies on passive
sounds in the environment for correlation. To increase the speed and accuracy of the
correlation when operating in the Passive Mode, the OSCOR will systematically tune to
each signal and perform two types of correlation:
1. A short term Acquire screen is the primary method of identifying a signal
containing correlation by detecting peaks within the screen’s scan time. This
Acquire function is usually performed for a relatively short period of time and
relies on the peak of the correlation window. If the threat level does not exceed
the specified threshold during the Acquire time, the system classifies it as a threat
level 1 and continues scanning.
2. If a correlation peak exceeding the threat level threshold is detected in the primary
Acquire screen, the system will immediately enter a 10, 30, or 60 second analyze
screen to perform statistical analysis of the function vs. time. In this Correlation
Analyze Mode, the threat level indicates the average of the threat correlation over
the specified time window. This average threat level is stored in memory along
with other signal information.
Verify Correlation
In the Verify Mode, the correlation process functions exactly like the Passive Mode, with
an additional ringer tone to ensure that the threat signal is real. In the Verify Mode, the
OSCOR provides an audible ringer tone at the completion of the passive correlation for
an additional correlation check. Since the ringer tone is used internally as the reference
audio, the correlator sensitivity is further increased, improving threat detection and
providing confirmation that an eavesdropping device exists.
NOTE: Since this mode provides an audible tone, it may not be considered covert by
some standards. However, the tone is designed to sound like a telephone ringer, and in
most situations, the ringer tone will be broadcast only a few times during a sweep.
Active Correlation
In the Active Correlation Mode, there is no Acquire and Analyze using passive operation.
Instead, the OSCOR broadcasts an audible tone for 3 seconds during the correlation
process of each signal. This mode of operation is definitely not covert, but it is very
reliable and fast, since it uses a known signal for correlation and needs only 3 seconds to
study each signal.
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