AIM 120B/C - IS MPRF/Husky WIP?

[mobua]

Hi,

Not really sure wich section this question belongs as it partly pertains to the F/A-18C, F-16C and F-15C. I was wondering if with the ongoing updates to the AMRAAM the Husky MPRF mode is under consideration or on the way?

Currently in the Viper for instance, I believe we are lacking the M-pole indication wich does carry a tactical significance. Furthermore, I do believe we are also lacking F-pole indication as the Viper currently only shows A-pole and time to impact.

Any clarification or update on the matter would be much appreciated.

@BIGNEWY@Wags@NineLine

Thanks!

[schurem]

Good sir, I have no idea what husky MPRF mode is, but are you certain it isn't classified?

[mobua]

44 minutes ago, schurem said:

Good sir, I have no idea what husky MPRF mode is, but are you certain it isn't classified?

There are those better qualified than me to answer that question. What I can say for sure is that there are approximations of M-pole (MPRF) and F-pole in other sims. Furthermore, I would assume that if they are able to implement A-pole, M-pole should be similarly sensitive.

TLDR: No I'm not certain.

[Frederf]

MPRF and HPRM are medium and high pulse repetition frequency. The AIM-120 uses sometimes "husky" = H = HPRF in certain geometries to extend its seeker range, especially head on.

Thus in an engagement the missile transitions though different phases of guidance, first command then HPRF seeking then MPRF terminal. In all cases command guidance is filtered in as a source of information even as the seeker has its own track. A missile supported only to HPRF is not as high Pk as one supported to MPRF and both are inferior to support to impact.

"Husky" is the radio proword related to HPRF guidance initiation like "pitbull" is to MPRF (or simply autonomous if no distinction).

The letter on the HUD has an A for autonomous which can come before M for MPRF along with the T and L for TTI and lose.

[mobua]

58 minutes ago, Frederf said:

MPRF and HPRM are medium and high pulse repetition frequency. The AIM-120 uses sometimes "husky" = H = HPRF in certain geometries to extend its seeker range, especially head on.

Thus in an engagement the missile transitions though different phases of guidance, first command then HPRF seeking then MPRF terminal. In all cases command guidance is filtered in as a source of information even as the seeker has its own track. A missile supported only to HPRF is not as high Pk as one supported to MPRF and both are inferior to support to impact.

"Husky" is the radio proword related to HPRF guidance initiation like "pitbull" is to MPRF (or simply autonomous if no distinction).

The letter on the HUD has an A for autonomous which can come before M for MPRF along with the T and L for TTI and lose.

Thanks for the clarification Frederf.

Title should be changed to: "AIM 120B/C - Is Husky/Pitbull WIP?"

[MARLAN_]

Pitbull is Medium Pulse Repetition Frequency Active (MPRF)

Husky is High Pulse Repetition Frequency Active (HPRF)

HPRF/MPRF modes for the missile work the same as for your aircraft radar, being that HPRF has more range but is better for high closure rates, and MPRF has less range but is better for low closure.

For F/A-18C only (I don't know how the F-16 works, but it's probably similar to some extent)

On your RDR ATTK display for the F/A-18C you should see a solid A indicating HUSKY/HPRF active, and a flashing "A" indicating PITBULL/MPRF active (currently in DCS we only get a solid "A" incorrectly indicating PITBULL/MPRF active)

The HUD would act the same as it does now in DCS, your dynamic TTA (Time-To-Active) cueing would display time to active for either HPRF or MPRF based on the MC calculation for which mode the missile would enter. Note that it doesn't necessarily step from HPRF to MPRF, it depends on closure, the missile could go directly to MPRF active, but an HPRF active state would eventually switch to MPRF active as the missile closes in range.

Also, as far as I'm aware, avionics set up aside, it doesn't appear to me as far as I can tell that any HPRF active state is implemented in DCS yet (in the Hornet at least). ED mentioned it's in the pipeline but who knows how long it'll be until released I guess.

Edited May 5, 2022 by MARLAN_

[mobua]

@BIGNEWY

Bumping the thread as I'm concerned with it falling into oblivion in the wishlist section.

Is there any update on this that you can share?

I fail to see how the FCR and the AIM-120B/C can be correctly modeled without the aforementioned modes.

Thanks!

[TheBigTatanka]

I've been asking about this too on the viper forums. The modes and the HUD indications are necessary to properly use the weapon. I'm hoping this gets attention now that the AMRAAM has been reworked.

Sent from my Pixel 3 XL using Tapatalk

[skywalker22]

Words of RL pilot John Ayres who has flown F-16 with 2000 flight hours from block 10 to 40:

I think with the words "DCS amraam is way off then IRL" he mainly means the lack of HPRF stage (husky). It only has MPRF stage (pitbull).

ps: this attachment was copied from GS`s youtube page, where he has been involved in discussion (F-16 vs Typhoon). You can check it out for your self.

[WHOGX5]

14 hours ago, skywalker22 said:

Words of RL pilot John Ayres who has flown F-16 with 2000 flight hours from block 10 to 40:

I think with the words "DCS amraam is way off then IRL" he mainly means the lack of HPRF stage (husky). It only has MPRF stage (pitbull).

ps: this attachment was copied from GS`s youtube page, where he has been involved in discussion (F-16 vs Typhoon). You can check it out for your self.

I don't even think he's referring to Husky to be honest. By emphasizing the usage of the term "Pitbull" itself I'm assuming he's referring to the fact that the DCS AIM-120 doesn't even try to reacquire or acquire a new target once it loses a lock. IRL, once an AIM-120 goes pitbull, it will not only look for the target it was fired at but it will track anything it can find. If it finds something and then loses lock it will try to reacquire the target or acquire a new target. In DCS if an AIM-120 loses a lock, it will either go dumb and fly in a straight line without reacquiring, or it will actively start turning away from the target in circles around itself without acquiring anything either. The target can also do an 180 degree continuous turn and notch the missile for 0.5 seconds and the AIM-120 will loose track and not even make an attempt to find the target again. So in its current state in DCS the AIM-120's MPRF mode has more of a "Golden Retriever Guide Dog"  kinda vibe to it.

[skywalker22]

Has there been done anything on AMRAAM to get HPRF stage? It's been quite a while the missile has got any significant improvement.

[F-2]

https://trace.tennessee.edu/cgi/viewcontent.cgi?article=6680&context=utk_gradthes

 

https://apps.dtic.mil/sti/pdfs/ADA355385.pdf
 

 

publicly available sources