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The antenna uses phase-frequency electronic scanning technology, forming sharp 3D pencil beams covering large surveillance and track volume. It uses a rotating platform with a high scan rate (30 RPM) to provide 360 degree coverage. The radar is designed with high resistance to electronic countermeasures (ECM) and anti-radiation missiles (ARM). [1]
The AN/SPY-1 [a] is a United States Navy passive electronically scanned array (PESA) 3D radar system manufactured by Lockheed Martin, and is a key component of the Aegis Combat System. The system is computer controlled and uses four complementary antennas to provide 360-degree coverage.
The active electronically scanned radar is mounted on a rotating mechanical gimbal with a 360 degree field of regard, although the antenna itself has a 110 degree field of view. In addition to SAR/GMTI, it has a dismount moving target indicator mode that can track a person walking on the ground from a range of 4.3 nmi (8.0 km; 4.9 mi). [7]
The radar antenna sends pulses while rotating 360 degrees around the radar site at a fixed elevation angle. It can then change angle or repeat at the same angle according to the need. Return echoes from targets are received by the antenna and processed by the receiver and the most direct display of those data is the PPI.
Raytheon AN/FPS-126 Solid State Phased Array Radar at Fylingdales with three faces for 360 degree coverage (constructed August 1989-October 1992) [11] Raytheon AN/FPS-120 [ 12 ] Solid State Phased Array Radar using an older antenna from the 1987 [ 13 ] PAVE PAWS EWR in Texas (groundbreaking 16 April 1998, [ 12 ] for the "Clear Radar Upgrade ...
The phased array itself has 45 degree scan limits to either side, giving a total scan coverage of 90 degrees, if the radar array is static. During Multisensor Tracking a 2-D battery surveillance radar (BSR) with 360 degree coverage and a larger detection range provides track data to the multifunction, slewable, 3-D phased array radar.