Su-27 / Su-33: No Radar when inverted below 1500m - ED Forums
 


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Old 07-10-2019, 10:24 PM   #1
BlackPixxel
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Default Su-27 / Su-33: No Radar when inverted below 1500m

We have encountered a strange issue with the Flanker radar in DCS:

When you fly below 1500m AGL and roll over more than 135° left or right, the radar will no longer work. Lock will fade and no targets will be shown on the scope when the lock is gone.

Under this condition (inverted and below 1500m AGL) the Radar will stop working at any range to the target.

https://www.youtube.com/watch?v=i7gv...ature=youtu.be

This cannot be intentional? To me it looks like a bug.
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Old 07-11-2019, 01:34 PM   #2
Ironhand
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I can confirm the lost lock issue, though in my case, after the lock is lost, the radar continues to function normally and the contact reappears in both SCAN (ОБЗ) and TWS (СНП). This is in SP.

EDIT: I should clarify. The contacts reappear once you roll more toward upright. As long as you are inverted, no contacts appear. Even without a lock, any contact disappears once you roll to the degree you specify and the radar no longer displays anything.
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Old 07-11-2019, 08:12 PM   #3
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Main thing here is NO MISSILE GUIDING... once if this happens missile not tracking

Rolling with RL only >>> lost lock >>> no missile guiding
Rolling with EORL >>> EOS lock will works only >>> again no missile guiding

Problem here is that system losing lock or switching on EOS while we guiding our ER missile. Only EO lock exist and we need shot new missile to force RL >>> EORL or manualy EO OFF to force RL.



This target have 0 chaffs - missiles are not chaffed but unguided because no RL.
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Old 07-11-2019, 08:21 PM   #4
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Hi

It probably has to do with the sidelobe clutter described in the F-15 manual since you are trailing the other aircraft at roughly the same speed.


From the F-15 manual:
The guard horn is attached to the slotted array in flat-plate radar antennas like the APG-63 and scans together with it for good compensation in all scan directions. In Russian Cassegrain radars like the N019 and N001 however, the guard horn is not attached to the scanning reflector but is rather fixed and aimed in a downward direction. Banking the fighter at low altitude during a radar lock on a fleeing target can thus rotate the compensation horn away from the ground, degrade the sidelobe compensation and break the lock due to ground clutter. During normal scanning operation in search mode, the entire radar Cassegrain antenna housing is roll-stabilized on a rotating gimbal to keep it oriented with the horizon. In this mode, search targets can be lost from the scope if the fighter roll exceeds the limits of the rotating gimbal (110-120 degrees angle of bank).

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Last edited by SnapRoll; 07-11-2019 at 08:23 PM.
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Old 07-11-2019, 08:32 PM   #5
Teknetinium
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Not implemented on F-15C, tested. Losing lock if you are inverted below 1500m, Where is the 1500m coming from, I understand if it was at 500m but at 1500, radar go off if the bandit is above you.
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Old 07-11-2019, 08:36 PM   #6
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Quote:
Originally Posted by Teknetinium View Post
Not implemented on F-15C, tested. Losing lock if you are inverted below 1500m, Where is the 1500m coming from, I understand if it was at 500m but at 1500, radar go off if the bandit is above you.

I was only quoting the F-15 manual. The F-15 does not have this problem. It talks about the limitations of the Russian radars.


And yes, I would also expect this to happen at a much lower altitude. I am not saying it is all correct. It could be this effect but not quite properly implemented.
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Old 07-11-2019, 08:39 PM   #7
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In the movie from Falcon it is a closing target. So it should definitely not happen there.
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Old 07-11-2019, 08:40 PM   #8
BlackPixxel
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Interresting find SnapRoll.

Maybe this is intended to model this behaviour. But it just shuts off the radar no matter what the target aspect is. He can be hot and 5 km in front of you, and your radar will lose lock. According to that F-15 manual it would only affect lock on a a cold bandit.
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Old 07-11-2019, 08:40 PM   #9
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I hope we are not making Su-27 after F-15s manual, Is this somewhere to find in Su-27?

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Old 07-11-2019, 08:43 PM   #10
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Quote:
Originally Posted by Teknetinium View Post
I hope we are not making su-27 after F-15s manual, that would be over the top. Then lets model AIM-120 from what it say in Russian Su-27 manuals about it. Is this somewhere to find in Su-27 Manual?

It's the FC3 ED manual...
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