Scanning Guide, Meaning , Facts, Information and Description

In telecommunication, the term scanning has the following meanings:

1. In telecommunications systems, examination of traffic activity to determine whether further processing is required. Scanning is usually performed periodically.
2. In television, facsimile, and picture transmission, the process of successively analyzing the colors and densities of the object according to a predetermined pattern.
3. The process of tuning a device through a predetermined range of frequencies in prescribed increments and at prescribed times. Scanning may be performed at regular or random increments and intervals.
4. In radar and radio direction-finding, the slewing of an antenna or radiation pattern for the purpose of probing in a different direction. In radar, scanning may be mechanical, using a rotary microwave joint to feed the antenna, or electronic, using a phased array of radiators, the radiated pattern (beam) of which depends on the relative phases of the signals fed to the individual radiators. In civilian air traffic control radar, scanning usually implies continuous rotation of the antenna or beam about a vertical axis. In military radars, scanning may occur about other than a vertical axis, and may not encompass a full 360°.

Scanning is also a term for the medical technique for body imaging.

See also: scanner

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