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.
| Frequency Band | Frequency Range x109Hz | Wavelength Range cm |
| P-band | 0.225 to 0.39 | 140 to 76.9 |
| L-band | 0.39 to 1.55 | 76.9 to 19.3 |
| S-band | 1.55 to 5.20 | 19.3 to 5.77 |
| X-band | 5.20 to 10.90 | 5.77 to 2.75 |
| K-band | 10.90 to 36.00 | 2.75 to 0.834 |
| Q-band | 36.00 to 46.00 | 0.834 to 0.652 |
| V-band | 46.00 to 56.00 | 0.652 to 0.536 |
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.
See also: Bearing Resolution, Clutter, Data Mile, Externally Sychronized Radar, Ground Clutter, Phased Array Radar, Plan Position Indicator, Q-band, Radar Altimeter, Radar Beam, Radar Detector, Radar Mile, Target Resolution, Three Dimensional Radar, Track Radar.
Subjects: Physics
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