Radar (radio detection and ranging)

A method, system, or technique of using beamed, reflected, and timed radio waves for detecting, locating, or tracking objects.

The frequency bands used by radar (radar frequency bands) were first designated by letters for military secrecy. These are shown in the following table.

Radar Frequency Bands
Frequency BandFrequency Range x109HzWavelength Range cm
P-band0.225 to 0.39140 to 76.9
L-band0.39 to 1.5576.9 to 19.3
S-band1.55 to 5.2019.3 to 5.77
X-band5.20 to 10.905.77 to 2.75
K-band10.90 to 36.002.75 to 0.834
Q-band36.00 to 46.000.834 to 0.652
V-band46.00 to 56.000.652 to 0.536

Dead Time

In radar, the interval following a pulse transmission during which the receiver is unable to respond to an incoming signal.

Meteorology

The signal from a weather radar unit is reflected and scattered from precipitation particles (rain, hail, snow) to determine the location, height and intensity of precipitation areas; comparison of multiple radar echoes permits determination of changes in intensity and the speed and direction of the areal movement.

R-T unit

The receiver-transmitter portion of a radar beacon system.

See also: Beacon, Bearing Resolution, Clutter, Data Mile, Externally Sychronized Radar, Ground Clutter, P-Band, Phased Array Radar, Plan Position Indicator, Q-band, Racon, Radar Altimeter, Radar Beam, Radar Detector, Radar Mile, Sea Clutter, Target Resolution, Three Dimensional Radar, Track Radar.

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Subjects: Physics


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