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Radar applications by frequency HF 3 to 30 MHz The very first British radar system chain home used the HF band but it was soon realised that these frequencies were becoming too crowded with other users and they suffered from too much external noise for serious use The HF band is still good for long-range over-the-horizon radar See examples of radar systems VHF 300 to 1000 MHz Used for Military airborne early warning AEW radars UHF is good for aircraft and missile detection in the midst of clutter The large high-powered antennas are also widely available for these applications L band 1000 to 2000 MHz Preferred for long-range air surveillance radar work 200 nautical miles such as in air traffic control systems that have to track aircraft between airports The military also has a fondness for L band in space surveillance and missile detection because this band is not very susceptible to nuclear blackout effects as lower frequencies S band 2 to 4 GHz S band is a very middle of the road band because lower frequencies are good for long range work and greater frequencies are best suited for getting accurate target information Used for medium-range airport surveillance work 50 to 60 nautical miles and long range weather radars Military 3D radars that determine elevation angle azimuth angle and range of targets use the S band sometimes maybe L band C band 4 to 8 GHz Used for long range precision tracking Most single frequency phased-array radar that do surveillance and weapon control for air defence use C band The S band above can also be used X band 12 to 40 GHz Used in shipboard civil marine tracking radar airborne weather avoidance radar police speed meters and systems that detect artillery projectiles Most synthetic aperture radars SAR use X band K band
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