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AN/SPQ-11

(Redirected from Cobra Judy)

The AN/SPQ-11 Cobra Judy was a PESA radar found on the USNS Observation Island (T-AGM-23) missile range instrumentation ship.

AN/SPQ-11
Close-up of the front of Cobra Judy radar, 1983.
Country of originUnited States
Introduced1983
No. built1
TypePassive electronically scanned array radar
Frequency2900-3100 MHz (E\F band)
Aft view of the USNS Observation Island showing the location of the Cobra Judy array.

It was used for space tracking, ballistic missiles tracking and other instrumentation. Cobra Judy was the Airforce code name for the afloat phased-array radar that was designed with a primary mission of monitoring Soviet missile tests and which operated in conjunction with land based phased-array radar Cobra Dane and Cobra Ball aircraft.[1] Cobra Judy was replaced by the Cobra Judy Replacement (CJR) in April 2014.

Classification of radar systems

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Further information: Joint Electronics Type Designation System

Under the Joint Electronics Type Designation System (JETDS), all U.S. military radar and tracking systems are assigned a unique identifying alphanumeric designation. The letters “AN” (for Army-Navy) are placed ahead of a three-letter code.[2]

  • The first letter of the three-letter code denotes the type of platform hosting the electronic device, where A=Aircraft, F=Fixed (land-based), S=Ship-mounted, and T=Ground transportable.
  • The second letter indicates the type of equipment, where P=Radar (pulsed), Q=Sonar, and R=Radio.
  • The third letter indicates the function or purpose of the device, where G=Fire control, Q=Special Purpose, R=Receiving, S=Search, and T=Transmitting.

Thus, the AN/SPQ-11 represents the 11th design of an Army-Navy “Ship-mounted, Radar, Special Purpose” electronic device.[2][3]

Replacement

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The Cobra Judy Platform, USNS Observation Island was taken out of service and stricken from the Naval Vessel Register March 31, 2014.[4] On 31 March 2014, the Cobra Judy Replacement program, aboard USNS Howard O. Lorenzen (T-AGM-25) reached initial operational capability (IOC). According to the Naval Sea Systems Command (NAVSEA), the U.S. Air Force also assumed operational and sustainment responsibilities for the ship.[5] The inertial navigation system for the antenna stabilization and alignment had been provided by iMAR Navigation.

See also

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References

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  1. ^ Richelson, Jeffery (October 1986). "Monitoring the Soviet Military". Arms Control Today. 16 (7): 16. JSTOR 23623200 – via JSTOR.
  2. ^ a b Avionics Department (2013). "Missile and Electronic Equipment Designations". Electronic Warfare and Radar Systems Engineering Handbook (PDF) (4 ed.). Point Mugu, California: Naval Air Warfare Center Weapons Division. p. 2-8.1.
  3. ^ Winkler, David F. (1997). "Radar Systems Classification Methods". Searching the Skies: The Legacy of the United States Cold War Defense Radar Program (PDF). Langley AFB, Virginia: United States Air Force Headquarters Air Combat Command. p. 73. LCCN 97020912.
  4. ^ "USNS OBSERVATION ISLAND (T-AGM 23)". Naval Vessel Register. Retrieved 2 March 2012.
  5. ^ "Cobra Judy Replacement Achieves Initial Operational Capability". Navy.mil. 1 May 2014. No. NNS140501-26. Retrieved 8 May 2014.
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