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Description of the radar set, tactical-technical characteristics
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Figure 1: AN-SPY-1

frequency: 3 100 … 3 500 MHz
pulse repetition time (PRT):
pulse repetition frequency (PRF):
pulsewidth (τ): 6.4 … 51 µs
receiving time:
dead time:
peak power: 4 to 6 MW
average power: 58 kW
instrumented range:
range resolution:
beamwidth: 1.7 degrees
hits per scan:
antenna rotation: none (fixed antenna)


The AN/SPY-1 is the electronically scanned fixed-array radar for the US Navy’s Aegis fleet air defence system. It operates in the F-band, and the output is in several megawatts. The transmitter serves several parallel channels simultaneously.

The four fixed and phase-scanned arrays of AN/SPY-1 send out beams of electromagnetic energy in all directions simultaneously, continuously providing a search and tracking capability for hundreds of target at the same time. Each array has 4,100 discrete elements, and measures 3,65 × 3,65 m. These elements are controlled by AN/UYK-7 digital computers to produce and steer multiple radar beams for target search, detection and tracking. The SPY-1 also tracks the ship’s own missiles fired against hostile targets. In addition to search and track, it provides midcourse guidance to the Standard missile (SM-2).

The Aegis system has been fully operational since 1983 and advanced versions of the radar have also been developed.

Picture gallery of AN-SPY-1

Figure 2: AN-SPY-1