Decatur Electronics GENESIS-VP, Руководство пользователя

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21
G
ENESIS
-VP™: User’s Manual
7. Care, Cleaning, and Storage
Do not spill food, beverages or other liquids and substances on the Genesis-
VP™. When the Genesis-VP™ is not in use or when it is being transported,
store it in its original packaging. To clean the Genesis-VP™, dust it lightly
with a soft clean cloth. The cloth should be free from any cleaning solutions.
8. Limitations to Doppler RADAR
When properly used, the Doppler radar system is extremely accurate and
reliable. However, the variations in the environment can cause situations and
circumstances which may create speeds that appear incorrect.
8.1 Cosine Effect
The cosine effect causes the system to display a speed that is lower than
actual vehicle speed. This condition exists whenever the target vehicle’s path
is not parallel to the antenna, including curves and hills. In all uses of police
radar, there is always a slight angle between the patrol and target vehicle to
avoid collisions.
Whenever the angle between the beam of the antenna and the target vehicle
increases, the displayed speed decreases. Ideally, an angle of zero (0) degrees
is preferable, since the displayed speed will be the actual target vehicle
speed. The following table shows the effects that an increasing angle can
have on the speed displayed.
At angles less than 10
°
, there is not much difference between the target and
actual speed. As the angle increases, the error increases. At 90
°
, the TARGET
speed is zero mph - grossly incorrect.