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G
ENESIS
-VP™: User’s Manual
8.2
Interference
Radar systems, like any other radio system, are subject to external
interference. The two most common kinds are radio frequency interference
and undesired moving objects.
Radio Frequency
The system may inadvertently process radio frequency energy from airport
radar, streetlights, high-tension power lines, microwave transmission towers,
CB radio transmitters, and AM/FM transmission towers as Doppler speeds.
The Genesis-VP™ unit has a radio frequency interference (RFI) detection
circuit, designed to detect excess radio frequency energy. When stray radio
frequency energy reaches an excessive level, the system will illuminate the
“RFI” icon in the display. Once the source of radio interference ends, the
system will resume normal operation. Also, any locked speeds will return to
the lock window.
Moving Objects
The system may also detect other moving objects in the antenna’s beam. Fan
blades, in the patrol vehicle, can generate undesired Doppler signals.
Since these signals can be similar to moving cars, the operator needs to
discern between a valid target and a source of interference. Usually, a source
of moving interference exhibits the following characteristics:
•
A reading when there is not a target vehicle in the operational range of
the antenna.
•
A target vehicle, upon entering the operational range, will override the
interference signal-causing the displayed speed to change suddenly.
•
The Doppler audio will be corrupted with noise, unlike a good, clear
Doppler tone.
•
Interference is irregular and does not provide a valid tracking history.
