Su-30, Su-33, Su-34 and Su-35 News thread, pictures and discussion

stealthflanker said:
1700

View attachment 807426

This is from "Survey of Russian low cost Phased Array". The MiG-31 part have error in FOV which supposed to be 35 degrees, not 70.

View attachment 807432

The beamsteering angle is curiously mentioned in a catalogue, as "possible shift of view center"
Click to expand...
How does it have a scan zone/fov greater than +-35 if its max beam steering angle is +-35?


Like, it has a scan zone of 90 degrees which is +-45?

Only way I can think is if it was on a mechanical gimbal like n011m but that’s obviously not true for zaslon.

Also, wouldn’t its max beam steering angle be +-70 as it did have +-70 gimbal limits?
1774958815713.png
 
Last edited:
kizvy said:
How does it have a scan zone/fov greater than +-35 if its max beam steering angle is +-35?
Click to expand...

Maybe it's something that missing in literature yet no one really bothers to correct. The only other possibility is the beamsteering angle is +-45 degrees. That still put the frequency well within X-band (8 GHz) The larger the beamsteering angle, one may notice the frequency become lower. If it's 70, then the frequency is 7 GHz, exactly 7030 MHz, which kind of hard to believe for airborne radar, wont this frequency interfere with communications ?

70 Degrees (which makes it total 140 degrees) Is militarily irrelevant as antenna gain decreases as the beamwidth increases due to aperture foreshortening phenomenon as well as emergence of grating lobe. Thus typical phased array stops scanning at 60 degrees. However the phase shifters that steers the beam will have "margin" which can be 7-10 degrees extra phase shift capability to prevent mismatch.
 
stealthflanker said:
1700

View attachment 807426
Click to expand...
That is so much lower than I expected, I would have thought Zaslon have at least 2500 T/R modules, doesn't Su-57 already have 1500 T/R module eventhough its radar is much smaller?

stealthflanker said:
This is from "Survey of Russian low cost Phased Array". The MiG-31 part have error in FOV which supposed to be 35 degrees, not 70.

View attachment 807432

The beamsteering angle is curiously mentioned in a catalogue, as "possible shift of view center"
Click to expand...
I think the 70° refers to the total field of view (covering both left and right), while ±35° indicates the range from the center boresight, 35° to each side, which also sums to a total of 70°.
Thought to be fair, Zaslon FoV seem very narrow, normal PESA/AESA seem to have 120 degrees total FoV.
 
Ronny said:
I think the 70° refers to the total field of view (covering both left and right), while ±35° indicates the range from the center boresight, 35° to each side, which also sums to a total of 70°.
Thought to be fair, Zaslon FoV seem very narrow, normal PESA/AESA seem to have 120 degrees total FoV.
Click to expand...
i Just have one question, what’s the difference between field of view and gimbal limit?
Because the brochure for mig-31e says that it can detect, acquire and track targets within a +-70 degrees zone in azimuth and +70…-60 in elevation.
So that would be 140 degrees in azimuth and 130 degrees vertically.
 

Attachments

  • 1775068454909.png
    1775068454909.png
    838.3 KB · Views: 40
Forest Green said:
View attachment 807790
Click to expand...

"The crew of the Su-30SM abandoned the aircraft in Crimea due to an engine fire. An attempt to extinguish the engine was unsuccessful.
The crew was evacuated.
All are alive.

A state commission will investigate the cause of the fire."

Fighet_bomber
 
It seems that the last years of wartime operations are starting to put a toll on the aging airframes. This is a quite high rate of attrition due to non-combat causes.
 
Ronny said:
I think the 70° refers to the total field of view (covering both left and right), while ±35° indicates the range from the center boresight, 35° to each side, which also sums to a total of 70°.
Thought to be fair, Zaslon FoV seem very narrow, normal PESA/AESA seem to have 120 degrees total FoV.
Click to expand...

One can sacrifice FOV for lower weight and cost. 120 deg or 60 deg or "Full FOV" array, means more elements, more elements means more weight.

Kalinigrad 8B antenna for Zaslon already weighs 300 Kg with total radar set weighs some 1495 Kg, that's with that 35 deg steering and 1700 elements. a full FOV array would need 2351 Elements, and thus the antenna might grow to 339 Kg, and total radar weight grow to 1884.5 Metric tonne.
 
Hm, really don't understand details about the N007 'Zaslon' but the things are clear.

''The phased array scanning angles were +70° in azimuth and from -60° to +70° in elevation. ''

Posts 71,93 and 94 ....


Su-34 armed with the AAM's type R-27R and R-74 in the Khmeimim air base-Latakiya/Syria.

Su-34 with R-27R and R-74.jpg
 
Last edited:

Similar threads

Back
Top Bottom