AN/FPS-115 “Pave Paws”

The AN/FPS-115 “Pave Paws” is a long-range, solid-state, active aperture UHF early warning radar, operating between 420 and 450 MHz. Developed by Raytheon E-Systems for the U.S. Air Force in the late 1970s, it is designed for the detection and warning of sea-launched ballistic missiles (SLBMs) and satellite tracking. The system typically features two circular planar phased arrays, each approximately 30 meters in diameter, inclined at 20 degrees from vertical and mounted on adjacent sides of a 32-meter-high building. Each array face utilizes 1792 active transmit/receive (T/R) modules, with an upgrade capability to 5354 modules, providing a combined coverage of 85 degrees in elevation and 240 degrees in azimuth. The radar has an instrumented range of 3,000 nautical miles (4,800 km), a peak power of 600 kW per face, and an average power of 150 kW, with a beamwidth of 2.2 degrees. Search pulse lengths include 0.3, 5, and 8 ms with a 0.1 MHz chirp bandwidth, while track pulse lengths range from 0.25 to 16 ms with a 1 MHz bandwidth. First deployed in the early 1980s, the AN/FPS-115 has been succeeded by upgraded versions such as the AN/FPS-120, AN/FPS-123, AN/FPS-126, and AN/FPS-132, which are currently in operation at various sites, including those that replaced older Ballistic Missile Early Warning System (BMEWS) radars.

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