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Country of originUnited States
TypeSolid-state active electronically scanned array (AESA)
Power20 kW peak[citation needed]

The AN/APG-77 is a multifunction low probability of intercept radar installed on the F-22 Raptor fighter aircraft. The radar is built by Northrop Grumman.

It is a solid-state, active electronically scanned array (AESA) radar. Composed of 1956 transmit/receive modules,[1] each about the size of a gum stick, it can perform a near-instantaneous beam steering (in the order of tens of nanoseconds).

AN/APG-77 in the National Electronics Museum.

The APG-77 provides 120° field of view in azimuth and elevation,[citation needed] which is the highest possible value for a flat phased array antenna.[2] APG-77 has an operating range of 100 mi (160 km) while unconfirmed sources suggest an operating range of 125–150 mi (201–241 km),[3] against a 1 m2 (11 sq ft) target. A range of 400 km or more, against a 1 m2 (11 sq ft) target, with the APG-77v1 with newer GaAs modules, is believed to be possible while using more narrow beams.[4][3]

More than 100 APG-77 AESA radars have been produced to date by Northrop Grumman, and much of the technology developed for the APG-77 is being used in the APG-81 radar for the F-35 Lightning II.

The APG-77v1 was installed on F-22 Raptors from Lot 5 and on.[5] This provided full air-to-ground functionality (high-resolution synthetic aperture radar mapping, ground moving target indication and track (GMTI/GMTT), automatic cueing and recognition, combat identification, and many other advanced features).[6][5][7]

See also[edit]


  1. ^ "Future DoD Airborne High-Frequency Radar Needs/Resources" (PDF). Department of Defense. April 2001. p. 19. Archived from the original (PDF) on 2012-09-20.
  2. ^ Physical limitation of the maximum swivel angle of an AESA
  3. ^ a b "F-22 Road Show" (PDF). Aviation Week & Space Technology. 8 January 2007. pp. 2–7. Archived from the original on 5 July 2014.CS1 maint: BOT: original-url status unknown (link)
  4. ^ "F-22 Raptor". Aeroweb.
  5. ^ a b "F-22 Raptor To Get Upgraded Radar". Defense Update. 2 April 2007. Archived from the original on 2016-11-22. Retrieved 2016-11-22.
  6. ^ "APG-77(V)".
  7. ^ "Northrop Successfully Completes F-22 Radar Flight-Test Certification". Archived from the original on 2009-08-02. Retrieved 2009-07-17.

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