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Close-up of the front of Cobra Judy radar, 1983.
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| Country of origin | United States |
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| Number built | 1 |
| Type | Passive electronically scanned array radar |
| Frequency | 2900-3100 MHz (E\F band) |
The AN/SPQ-11 Cobra Judy is a PESA radar found on the Observation Island-class missile range instrumentation ship.
It is used for space tracking, ballistic missiles tracking and other instrumentation.
Cobra Judy is the sea component of the COBRA program for monitoring missile launches and outer space.