I am quoting an old Article here which seems to have some good amount of Information With regards to the R-77, so here is the Article:
Could Russia's R-77 Missile Crush the U.S. Air Force in a War?
The R-77 air-to-air missile, which will be the primary air-to-air armament of the upcoming Su-57, has had a troubled development compared to its American counterpart, the AIM-120 AMRAAM. Starting life in the 1980s as a Soviet developmental program aside the AMRAAM, its testing and development dragged on due to the collapse of the Soviet Union. It was only adopted in 1994, two years after the AIM-120’s first operational kill during Operation Southern Watch. However recently it has seen a revival, arming some Russian fighters operating over Syria. It also has seen considerable export success. Its manufacturer, JSC “Tactical Missiles Corporation” is now working on an upgraded version that is to arm the Su-57 that includes a new AESA seeker, a technology that has not been included on the AMRAAM (although the Japanese AAM-4B has one).
Technologically, the R-77 is an active-radar homing missile, meaning that the seeker itself has a small radar that sends out radar pulses to detect the target and then uses that information to home in on the target. The current R-77 and R-77-1 use mechanically directed doppler radar without AESA, while rumored future variants will use AESA, in which the radar beam can be electronically directed with greater precision and speed (the use of AESA does not preclude the use of mechanical direction; modern Russian radars have been seen with both). The missiles also possess inertial guidance. Aerodynamically, the R-77 is distinctive among air-to-air missiles in that it uses grid (lattice) fins, an innovation that greatly increases the surface area versus traditional fins. This allows the R-77 to maneuver at higher angles of attack. These fins are also foldable allowing the R-77 to be placed on internal missile bays of some aircraft. The R-77 also uses a laser proximity fuze, in contrast to the AIM-120, which uses a radar proximity fuze. The laser fuze is immune to ECM by design principle; however, the AIM-120’s fuze is said to be designed to be resistant to ECM as well.
Some good amount of info with regards to R-77 in here.
Or is it simply too little, too late?
nationalinterest.org
