Looking at the range figures RCS of 0.003 sq. m at a distance of over 2 km for Ka band seekers.
I think they have opted for higher frequency MMW seeker of 40 GHz Ka band and focused on Anti-Jamming/Burn through capability , Target Imaging with Ka band and all weather capability over Longer range for seeker.
Using K or Ku band as in R-77 might have its limitations in an era where AC carry DRFM jammers and stand off jamming available , Ka band should also be good against LO Target. and using AESA can provide faster Scan Rates and lower side lobes with perhaps lower power needed.
This would also mean R-77M would depend on AC main radar for LR tracking , Guidance and MC updates.
The RVV-BD carries dual seeker of X/Ku Band , R-77 etc carries Ku band seeker and the one for R-77M is a new AESA seeker with Ka Band
Active radar seeker with an active phased array antenna 9B-1103М2.
The illustrations show the layout of the GOS exhibited at the exhibition MAKS-2019 and the booklet given by “Agate”.
The latest development of JSC “mnii Agat”
is Designed primarily for advanced missiles “air-air” medium-range missiles, in particular, for the R-77M.
Serial production of the missile already starts, in accordance with the contract signed, the Ministry of defense during the forum Army-2019.
According to the developers, the GOS is also suitable for rockets of class “air-surface”.
Having an antenna diameter of only 100 mm, seeker can detect targets with
RCS of 0.003 sq. m at a distance of over 2 km
with RCS of 0.1 sq m (rocket “air-Air” or stealth fighter) – 5 km
with RCS of 5 sq m (conventional fighter) – more than 12 kmAvailable frequency bands of operation – Ki and Ka.
Weight of GOS is noticeably smaller than its predecessor 9B-1103М (for missiles R-77-1 and RVV-SD) – weight 3.5 kg vs 5.7 kg, 230 mm length 300 mm and diameter 100 mm vs. 150 mm, with comparable characteristics.
However, the main feature of GOS is electronic beam steering antennas and, as a consequence, much more rapid scanning of the airspace in comparison to all predecessors that will be surely helpful for the tasks of missile defense of the carrier, and also in conditions of active electronic countermeasures by the enemy. In creating the AESA seeker for this was also attended by Fazotron-NIIR and NIIP Tikhomirov.
Text and photos: encyclopedia of Military Aircraft
Photos & News Credits : RDF
At ARMY 2019 , design Bureau “Vympel” demonstrated its new development – a missile “air-air” which exceeds in its parameters the existing missiles of this class. “Product 180” is a new missile received index K-77M, which will be initially installed on su-57, and in the future may go for export abroad. https://vladimir-krm.livejournal.com/5950713.html
Key Features:
New Dual Pulse Motor
AESA Radar Seeker for Missile
Range of 190 km+ at High Altitude & High Altitude Manouvering Capability
New aerodynamic scheme with X-shaped wings that reduces drag and as a consequence increased range
In the framework of military-technical forum “Army-2019” design Bureau “Vympel” demonstrated its new development – a missile “air-air” which exceeds in its parameters the existing missiles of this class.
“Product 180” is a new missile received index K-77M, which will be initially installed on su-57, and in the future may go for export abroad.
And though the rocket received index K-77M, but it has nothing to do with the missile K-77. The rocket is produced with a new aerodynamic scheme with X-shaped wings that reduces drag and as a consequence increased range.
Rocket in addition to the main wing (2 in diagram below) also added a stationary aerodynamic surface (4) before “driving” (3), which allowed to solve the main problem of all long-range missiles “air-air”, namely the ability to maneuver at subsonic speeds. For example, the famous American missile AIM-120 and its recent modernization the AIM-120D have not been able to maneuver at speeds of less than 1200 km/h (while trying to maneuver increased angle of attack, and the rocket began to disintegrate.)
Also the missile is equipped with a double-pulse solid-propellant engine, which allowes high-altitude maneuvering and enables a range of up to 192 kilometers.
In addition, the missile is equipped with inertial navigation system and active radar homing head.
All these changes make the new missile K-77M a truly unique and a real formidable weapon.
Experts pay attention that apparently the Russian defense Ministry are very serious about the project su-57 and to develop this fighter is really unique weapons that have no analogues in the world. We already know that the su-57 would be installed a shorter version of hypersonic missile “Kinzhal” gliding cluster bomb “Drel”, and now the missile K-77M. All of these types of weapons created recently and is unique in its characteristics.
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