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Article: radar
- Article from:
- The Columbia Encyclopedia, Sixth Edition
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Copyright informationThe Columbia Encyclopedia, Sixth Edition. Copyright 2008 Columbia University Press. (Hide copyright information)
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radar system or technique for detecting the position, movement, and nature of a remote object by means of radio waves reflected from its surface. Although most radar units use microwave frequencies, the principle of radar is not confined to any particular frequency range. There are some radar units that operate on frequencies well below 100 megahertz (megacycles) and others that operate in the infrared range and above. The term
radar,
an acronym for
ra
dio
d
etection
a
nd
r
anging, is also used to denote the apparatus for implementing the technique.
Principles of Radar
Radar involves the transmission of pulses of electromagnetic waves by means of a directional antenna; some of ...
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