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File:RAAF radar.jpg
An Australian AN/TPS-77 in 2007
Country of origin United States
Introduced 1980
Type Long-Range Radar System
Frequency 1215 to 1400 MHz (D/L)
PRF 241
Pulsewidth 51.2 / 409.6 μS
RPM 5 or 6 RPMs
Range 470 km (250 nmi)
Altitude 30.5 km (100,000 ft)
Azimuth 0.18° at 250 km
Elevation -6° to +20°
Power 24.6 kw
Other Names AN/TPS-77

The AN/FPS-117 is an active electronically scanned array (AESA), 3-dimensional air search radar. It is produced by Lockheed Martin.[1]

The system is a low power, long range (200-250 nautical miles), L-band pencil beam, solid-state transmitter and beacon interrogator search radar. System design includes a redundant architecture with computer software remote controlled and monitored operations to minimize manning requirements.

The AN/FPS-117 is in use as part of the American-Canadian North Warning System of radars stretching across North America from Alaska, USA to Labrador, Canada. This North Warning System is designed to provide long-range detection and coverage for drug interdiction support and tactical command and control.

Implementation of the North Warning System has resulted in a reduction in Operations and Maintenance (O&M) spending by up to 50% compared to previous systems. Due to extreme northern locations of these radars, the physics of radiowave propagation in the 1215-1400 MHz frequency range is even more critical for target detection requirements. The Air Force and the FAA also operate a limited number of AN/FPS-117 radars within the continental United States. The AN/FPS-117 radar is capable of randomly hopping among 18 channels in the 1215-1400 MHz band.[2]

In 2011, Lockheed Martin was awarded a contract to upgrade the radars to extend their operational lives through 2025.[3]

It is in operation in several other countries including Australia, Belgium, Brazil, Croatia, Denmark, Estonia, Germany, Hungary, Iceland, Indonesia, Iraq, Italy, Jordan, Kuwait, Latvia, Pakistan, Romania, Saudi Arabia, Singapore, South Korea, Taiwan, Thailand, Greece and the United Kingdom.

The RRP-117 version is a model which is being supplied to Germany with an offset input from Siemens in fixed-site applications. (more: „Radar Basics”)

The transportable version is called AN/TPS-77.

It is similar to the AN/TPS-59.


  1. Lockheed Martin. "AN/FPS-117 LONG-RANGE AIR SURVEILLANCE RADARS" (PDF). Retrieved 2013-10-13.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  2. "AN/FPS Series". Retrieved 2013-10-13.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  3. "Lockheed Martin to Modernize 29 U.S. Air Force Early Warning Long-Range Surveillance Radars." Lockheed Martin, 7 November 2011.