AN/SPQ-11 “Cobra Judy“
Description of the radar set, tactical-technical characteristics
Figure 1: The AN/SPQ-11 “Cobra Judy“ S-band radar array is located aft of the “Cobra Judy“ X-band dish under the radome.
Figure 1: The AN/SPQ-11 “Cobra Judy“ S-band radar array is located aft of the “Cobra Judy“ X-band dish under the radome.
| Specifications | |
|---|---|
| frequency: | 2 900 … 3 100 MHz
(S-Band) |
| pulse repetition time (PRT): | |
| pulse repetition frequency (PRF): | CW … < 400 kHz |
| pulsewidth (τ): | CW … > 50 ns |
| receiving time: | |
| dead time: | |
| peak power: | |
| average power: | |
| instrumented range: | > 2 000 NM (≙ > 3 700 km) |
| range resolution: | |
| accuracy: | |
| beamwidth: | |
| hits per scan: | |
| antenna rotation: | |
| MTBCF: | |
| MTTR: | |
AN/SPQ-11 “Cobra Judy“
AN/SPQ-11 “Cobra Judy“ is operating in the S-Band shipborne long-range surveillance radar designed to detect and track intercontinental ballistic missiles launched by Russia in their west-to-east missile range. It is mounted aboard the USNS Observation Island (Figure 1) and was designed in 1976. The S-band radar became operational in 1981.
The octagonal passive phased array antenna, approximately 7 m in diameter, is composed of 12 288 antenna elements. Its transmitter uses 16 traveling wave tubes in a corporate feed structure.
The radar is mounted on an azimuth pedestal. The entire system weighs about 250 tonnes, stands over forty feet high.