reported AIM-120 terminal guidance failure

Default774 · August 22, 2023

The AIM-120 has a chance of experiencing a tracking failure in the later stages of terminal guidance when fired at multiple radar detectable targets. In the case of the track, a pair of mi-24s being engaged by a NASAMS battery.

120_wh.acmi 120_wh.trk

Pavlin_33 · August 22, 2023

Look at that thing go. What's the speed of the 120? It's flopping around like it's made of cardboard and has zero inertia.

Default774 · August 22, 2023

3 minutes ago, Pavlin_33 said:

Look at that thing go. What's the speed of the 120? It's flopping around like it's made of cardboard and has zero inertia.

About mach1.3/820kts TS. This is generally how the 120 behaves when at speeds lower than about mach 2.

Edited August 22, 2023 by Default774

Default774 · August 22, 2023

As another funny sidenote, you should see what 120s do when they target an already destroyed target or miss. You could say there's some very slight oscillations.

120_twitch.acmi 120_twitch.trk

Flappie · September 6, 2023

Thanks for the heads up. This issue is now reported.

DCS FIGHTER PILOT · September 9, 2023

On 9/6/2023 at 6:20 PM, Flappie said:

Thanks for the heads up. This issue is now reported.

I would also like to point out that the Aim-120B will often times chase a missile fired from the target aircraft instead of the aircraft towards the end of flight. At least this is the case in MP.

Default774 · September 9, 2023

1 hour ago, DCS FIGHTER PILOT said:

I would also like to point out that the Aim-120B will often times chase a missile fired from the target aircraft instead of the aircraft towards the end of flight. At least this is the case in MP.

If you have any specific examples of this happening I'll try to reproduce it and report it seperately

DCS FIGHTER PILOT · September 9, 2023

33 minutes ago, Default774 said:

If you have any specific examples of this happening I'll try to reproduce it and report it seperately

As I mentioned, it seems to be more of a multiplayer issue. I tried recreating it in the mission editor but no go. I suppose the best thing to do is to try an capture it when it happens. I will say the behavior is very similar to your first post where the missile can't decide on whether to track the plane or the missile it fired.

Edited September 9, 2023 by DCS FIGHTER PILOT

Meteorlover · September 14, 2023

I've been engaged for a long time, a lot of times, using an aim-120 and I've noticed a strange phenomenon a few months ago

After a particular patch *I don't know exactly when*
As soon as the AIM-120 looks at the ground, it loses its target tracking or gives up tracking at all and falls to the ground.
In most situations, there is a distance of more than 20,000 feet from the ground!
It only needs a very 0.5 second or less BEAMING moment.Or not at all
From what I've seen, the seeker on the AIM-120 doesn't filter out any ground clutter
It doesn't head to the expected position, and there's a ferocious charge as if there's a target on the ground
If you simply go down in a semicircle, you can avoid the missile

And when this is combined with the DCS's notching decision
In almost every situation, you can crash a missile into the ground
Even if the target and missile are less than 3nm away
If you place the M mark on the RWR in the direction of 3 o'clock or 9 o'clock, most of them will not be hit.

Missiles without AIM-120 logic appear to be relatively less prone to this phenomenon.

8/3