reported earlier [OB 2.7.18.30765] AIM-120 HOJ Tail-chase twitching and weird guidance

[Default774]

The AIM-120 currently does not guide properly onto targets using ECM in tail-chase scenarios. The guidance gets progressively worse the higher vertical aspect you have to your target. A few seconds before impact, the missile will pitch up and down for seemingly no reason. The missile might still hit the target, but not always.

In the LOOKUP_2&3 tracks/acmis, the problem is especially evident; the Missile pitches down inexplicably and loses track, then proceeds to start twitching away left to right, losing all of its speed.

This guidance behaviour only occurs in tail-chase scenarios with the target using ECM. All shots fired within NEZ.

120_ECM_tailchase_COALT.trk 120_ECM_tailchase_LOOKDOWN.trk 120_ECM_tailchase_LOOKUP.trk 120_ECM_tailchase_LOOKUP_2.trk 120_ECM_tailchase_LOOKUP_3.trk 120_ECM_tailchase_LOOKUP_3.acmi 120_ECM_tailchase_LOOKUP_2.acmi 120_ECM_TAILCHASE_COALT.acmi 120_ECM_TAILCHASE_LOOKDOWN.acmi 120_ECM_TAILCHASE_LOOKUP.acmi

Edited October 18, 2022 by Minimalist

[DSplayer]

Yeah after doing some testing with a friend to simulate a PvP type scenario, we had the same problem and we were able to make the missile miss almost 100% of the time for planes that had barrage jammers combined with the extensive usage of chaff. Starting a dive and then pitching up abruptly will cause the missile to continue to lose track and basically guide on a predicted path as if I didn't pitch up or it will try to pull up and track the target aircraft but then will twitch out resulting in the missile losing track.

 

Anecdotally I've noticed that the AMRAAM of OB 2.7.18.30765 to be degraded in performance when compared to OB 2.7.18.30348 outside of the missile pitching up when it doesn't have a track on a target. The missile in the 2.7.18.30348 patch seemed to track better against cold and beaming targets (not losing track or twitching), especially when the parent aircraft had continued to hold track against the target aircraft when compared to the latest patch (2.7.18.30765). I, however, didn't test a situation that was similar to what you present in the previous patch. Maybe I or someone else can download that version and give a it a test another time.

Edited October 19, 2022 by DSplayer

[Default774]

Additional tracks/tacviews to look at, now from the target POV with an AI shooting me within NEZ. The missile can be consistently defeated by diving, then pulling up while chaffing. The missile loses track, then tweaks out and loses all of its speed.

120_POV_chase.trk 120_POV_chase_2.trk 120_POV_chase_2.acmi 120_POV_chase.acmi

120_POV_chase_3.trk 120_POV_chase_3.acmi

Edited October 19, 2022 by Minimalist
added 3rd track

[Default774]

Issue still occurs on 2.8.0.32066

[Mareno]

@NineLine

[Маэстро]

Known issue. Already reported