AN/SPS-21
Description of the radar set, tactical-technical characteristics
Figure 1: Antenna AN710 used by AN/SPS-21
| Specifications | |
|---|---|
| frequency: | 5.5 … 5.6 GHz
(C-Band) |
| pulse repetition time (PRT): | |
| pulse repetition frequency (PRF): | 1 500 Hz |
| pulsewidth (τ): | 0.19 µs |
| receiving time: | |
| dead time: | |
| peak power: | 10 kW |
| average power: | |
| instrumented range: | 16 NM (≙ 30 km) |
| range resolution: | |
| accuracy: | |
| beamwidth: | 2° |
| hits per scan: | |
| antenna rotation: | |
| MTBCF: | |
| MTTR: | |
AN/SPS-21
AN/SPS-21 was small and lightweight, operating in C-Band, short range surface surveillance and navigation radar designed for installation in small vessels.
The transmitter is of magnetron type self-excited oscillator. The paraboloidal reflector is 93 inches wide and 22 inches high and fed by a pyramidal horn providing linear horizontal polarization.
The first AN/SPS-21 radars were installed in 1954-1955.