AN/APG-77

The AN/APG-77 is a multifunction 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 1500 transmit/receive modules, each about the size of a gum stick, it can perform a near-instantaneous beam steering (in the order of tens of nanoseconds).

The APG-77 provides 120° field of view in azimuth and elevation,, which is the highest possible value for a flat phased array antenna. As yet unconfirmed sources suggest that APG-77 has a 'typical' operating range of 193 km and is specified to achieve an 86% probability of intercept against a 1 m2 target at its maximum detection range using a single radar paint. Other source described only as being more than 100 mi. However, it's thought to be closer to 125 - 150 mi, which is much farther than the standard F-15's 56 mi radar range

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. 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).