Unsolved JASSM is missing targets
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@Hubert3000 said in JASSM is missing targets:
Update: Got new nvidia drivers 531.68 WIn10 and seems a lot better. Still slightly off target but only a few meters not like 50m off. Didn’t expect that to have an effect but with this game you never know.
No idea (really, not even foggiest) how a Graphics driver update can even be involved with GPS targeting. I’m sure there is something else here.
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@Hubert3000 My specs are:
i7-9700K
RTX 2070
32 Gb RAM
1440p widescreenI am quite happy with my fps, not using VR though
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I did few tests. My conclusion so far is that JASSM is wind sensitive.
Reprocase Details
Setup:
- TE / 1 x F-16CM-52 / 2 x JASSM
- Targeting with Markpoint through Sniper (ICP 7 - TGP - TMS Up - ICP 0 - CZ)
- No change on CTRL Page
- Changing Wind Direction on every test (0°, 90°, 180°)
Process for each tests :
- Power ON and wait for RDY
- Arriving on Kotar from West, with a bearing of 90° (IP on Delta)
- Drop 1 x JASSM
- Change direction for quarter circle to arrive on Kotar from South, with bearing 180° (IP on Charlie)
- Drop 1 x JASSM
Results :
- With a significant wind (20-30 kts) the JASSMs drift from target on the side opposite to the wind.
Confirming on the same scenario with SDB: Right on Targets
Video of one of the tests (wind from the east, missiles drift west)
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@CheckPoint said in JASSM is missing targets:
With a significant wind (20-30 kts) the JASSMs drift from target on the side opposite to the wind.
Confirming on the same scenario with SDB: Right on Targets
This sounds like maybe 2 bugs?
What range (distance/altitude) were you releasing?
At 50nm and 25k ft, with ~20 kt headwind or crosswind, I wasn’t able to get jassm to miss.
I haven’t tried stretching the range out to max-jiz … because then I would expect the possibility for it to miss or fall short.
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@airtex2019 said in JASSM is missing targets:
@CheckPoint said in JASSM is missing targets:
With a significant wind (20-30 kts) the JASSMs drift from target on the side opposite to the wind.
Confirming on the same scenario with SDB: Right on Targets
This sounds like maybe 2 bugs?
What range (distance/altitude) were you releasing?
From 25 to 14 nm, 20 000 ft
EDIT : Add wind settings
EDIT : Add one video of the tests (wind from the east, missiles drift west)
EDIT : Graphical results of Tests (Aim was the central target)
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Already looked at wind guys. Zero wind still off by about same amount here.
Really don’t know how you can repro.
So there is something different about jassm what is it? That is probably the answer IMO. And I mean code in game like misdata or something like that.
Are you seeing jassm drop in alt slowly as it flies?
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@Hubert3000 said in JASSM is missing targets:
Are you seeing jassm drop in alt slowly as it flies?
No : Stable cruise flight at 20 000 ft + Important dive on target for termination flight (see @ 0:46 in the video)
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So according to your chart does that mean you are seeing jassm go off target with only 10kts wind but SDB is hitting, is that correct? Looks really weird.
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@Hubert3000 said in JASSM is missing targets:
So according to your chart does that mean you are seeing jassm go off target with only 10kts wind but SDB is hitting, is that correct? Looks really weird.
With 10kts wind, JASSM hits are almost on target (central target)
With 30kts wind, JASSM hits SEEMS to move away from target (only one hit close to target)SDB hits are always on target (not represented on the chart).
I may continue testings with event higher wind strength to confirm if it really has an impact.
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@airtex2019 said in JASSM is missing targets:
At 50nm and 25k ft, with ~20 kt headwind or crosswind, I wasn’t able to get jassm to miss.
What type of target ?
Could it be that combination of small drift (wind <30 kts) and JASSM blast radius make the target destroyed even if missile is to “right on target” ?Question to understand what make the difference between our different observations.
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OK I’ve looked at stock fair weather jassm miss and zero wind jassm miss, will check strong wind like 40kts and see if it has an effect. ie bigger miss.
Try zero wind… -
@CheckPoint said in JASSM is missing targets:
What type of target ?
Control Tower building at Haeju, NK. They may have missed by 20 ft but not by miles, like OP reporting.
I’m using TR#13 with altered loadout. No threats in area so I just fly in behind them, and watch them slam into the ground floor of the bldg.
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@CheckPoint said in JASSM is missing targets:
From 25 to 14 nm, 20 000 ft
what JASSM range and alti, I mean.
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Never said miles… 50m is 50 meters. Did you think it was miles. And that wasn’t in OP. Screenshot in OP shows example of miss clearly it is not miles.
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@Hubert3000 You said “Big miss” and I couldn’t see anything else around for … idk, hundreds of meters? could be miles? I dunno. I’m just trying to help repro.
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I think I maybe have an idea.
When I’m assigning precision steerpoint, I’m doing it (mostly out of habit) the old way, using this button on the Recon window
If I open the data cartridge, I can see that it has set target steerpoint #4 (or #99 or whatever) appropriately.
But if I use this newer Target List pane, which pops up along with Recon window … maybe I’m doing it wrong? – I’m clicking ‘Assign’ and it looks like it assigned the control-tower to WP#4 but then it doesn’t show up in Data Cartridge window … and indeed my missiles hit a few hundred yards away, landing at non-precision-waypoint #4
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@airtex2019
The settings in the target list are just there to assign targets to different aircraft. They don’t produce precision steerpoints. When you arrive on target, you can see this clearly in your TGP, which is not exactly aligned.You have to use DESIGNATE AS TGT STPT in recon window. These are settings solely for the player.
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No, JSSM doesn’t depend on wind. It simply can’t be because there is nothing in the missile’s guiding code that take wind into account.
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@I-Hawk said in JASSM is missing targets:
No, JSSM doesn’t depend on wind. It simply can’t be because there is nothing in the missile’s guiding code that take wind into account.
OK, so pb is coming from something else.
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Hi @CheckPoint,
I would understand the effect of the wind direction and strength with a free fall bomb but I don’t understand this effect with a GBU weapon. Why don’t we observe this effect with a LGB and with a GBU-31? These weapons are always reaching their targets. A GPS-assisted weapon should compensate its flight path for external factors like the wind and “land” where we expect him to be. Is it possible that the JASSM is missing the target because of the (lack of) accuracy of GPS coordinates of the ground target?