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Country of origin United States
Type Solid-state active electronically scanned array (AESA)
Azimuth 120°
Power 20 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] Unconfirmed sources suggest that APG-77 has 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]

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