The radar scanner is an aerial which rotates continuously. The aerial alternatley transmits and receives in quick succession. By scanning the horizon, the echoes it receives, can be built up into a circular picture. The origin (scanner position) is at the centre of the circle and the echoes it receives will 'paint' a picture like a map, in plan view. This type of display is called a PPI (Plan Position Indicator)
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Because some viruses are stealth like. They fly under the radar, or can even block virus scanners from working all together.
The Best source I've found is at the related link below, but you can frequently find a good buy on eBay.
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A radar mast is a high platform to mount a radar antenna such as the radar has an unobstructed view.
A radar engineer works with radar. They have design, develop, install, and test a radar.
Radar!
There is no sacnner, so I don't know what you're talking about.
scanner
The image generated by radar is typically called a radar image or radar map.
Radar range is the distance of the object from the radar. Radar bearing is the direction of the object in relation to the radar. As radar is primarily used for ranging, the range information may be more important than the bearing.