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Aeronautical Long Range Surveillance Radars
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Long range surveillance radars are used for air traffic control purposes. Long range radars are able to detect objects as small as 1-2 m^2 cross section out to distances as far as 200-250 nautical miles.
In the United States, there are approximately 130 long range surveillance radars spread across the country as part of the Joint Surveillance System (JSS), shared among FAA, DoD, and the Department of Homeland Security.
Long range surveillance radars can also be used for weather detection, by switching from vertical polarization (for aircraft detection) to circular polarization mode. They can also be used as terminal radars (for monitoring traffic closer-in to airports), under conditions of greater-than-normal separation between aircraft.
The scan time (rotation rate) for long range radars is 12 seconds, which provides position updates for aircraft five times each minute.
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Frequency Bands |
| Band | Use | Service11 | Table |
| 1240 - 1370 MHz | Aeronautical long range surveillance radars | Aeronautical Radionavigation | - |
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