Question on Harm HAS ALIC and RWR display
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I’ve looked through 34-1-1 and other documentation, but I can’t find information on the HAS ALIC.
What do the, for want of a better word, graded vertical and horizontal lines represent?
Also, I’ve noticed in the Harm training mission a difference in terms of position off the nose of the aircraft of an SA-3 between the RWR and HAS. I’m expecting the SA-3 to be left of an SA-2, but on the RWR it’s to the right and just behind it, whereas with the HAS it’s in a different relative position.
Am I missing something in my understanding of RWR or HAS, or both?
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ALIC is hardware not a HARM delivery mode but I assume in HAS. The tick marks are angles of the contact. I think in 20 degree increments. The FOV of the seeker is quite large.
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They are in 10 degs increment.The vertical ones can be used in conjuction with the pitch ladder to estimate the range
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So before designating the target with TMS up the lines are marked in 10 degree increments?
The vertical ones can be used in conjuction with the pitch ladder to estimate the range
Do you mean that as you change aircraft nose up and nose down the vertical line also adjusts? That makes sense when I think about it. How would you go about estimating range using that method?
Also, what does ALIC actually stand for?
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No. It has nothing to do with the a/c´s attitude
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i was thinking and one can correct me if im wrong that the horizontal grade line gives you indication of the radar location to the left or right ( angle ) while the vertical grade gives you a distance to the radar as in a top down view , is that correct ?
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No. It has nothing to do with the a/c´s attitude
Then could you expand on how it can be used to estimate range?
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like any other missile. its altitude and speed dependant
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If the s-a sites are on the briefing map, you can set target steerpoints at them and them use the POS methods of AGM delivery which will give you HUD cues for distance.
If the sam sites are NOT on UI map and are only mentioned in briefing information under threats (ie. “SA-5 located 3 miles NE of Wonsan”) and thus you have to use the HAS mode to fire HARMs, which offers no distance to target information, the only ways that I have been able to estimate distance to targets to see if you are inside the weap delivery zone is (1) to place target steerpoints at the estimated position of s-a threats using the threat information listed in briefings (this will require you use map features to show political sites -towns/cities - and their names and zoom in to find) or much easier, (2) if the HAS shows a threat target out in front, lock it up and command your wing to “attack my target”. The wing will respond with a “roger, attack target at XXX degrees YY miles”. He gives you the miles and based upon your altitude and loft you can judge whether you are within the weapons envelope to fire. And unless you want you wing to actually attack the target, make sure you immediately command him to rejoin or else he will gladly fly off to try and kill it.
Hope this helps.
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i was thinking and one can correct me if im wrong that the horizontal grade line gives you indication of the radar location to the left or right ( angle ) while the vertical grade gives you a distance to the radar as in a top down view , is that correct ?
I foresee some experimentation in the training mission with PPT 59 and PPT 56 in particular.
If anyone can discover some form of manual for HAS mode I for one would be extremely grateful. I’d like to do a tutorial on it but it feels like I’m missing something important with it.
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another way is to experiment as to where you pick up the target in HAS mode. say its 80nm, the HARM envelope. as soon as a SAM appears on HAS mode you make an OA point with range 80nm and bearing,say, 360. and you have your location
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i was thinking and one can correct me if im wrong that the horizontal grade line gives you indication of the radar location to the left or right ( angle ) while the vertical grade gives you a distance to the radar as in a top down view , is that correct ?
From the training manual:
“The WPN page displays the ALIC which is the HARM WIDE field of view ahead and down by default.”
I took that to mean that the vertical line represents elevation (similar to the boresight view once locked). Not sure if that’s right or not though.
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ALIC is Aircraft Launcher Interface Computer. It’s the support electronics (built into the launcher rail) that interfaces with the MIL-STD-1533 bus allowing the airplane to specify target parameters.
I don’t think it’s 10 degree increments because the weapon can detect emitters seriously far off in azimuth. It would be easy to test though. Find an emitter in pre-designate HAS and turn the airplane to place the symbol on a hash mark and note the heading. Lock up the emitter and then turn the airplane to center the symbol in the ALIC synthetic video view and note the heading. That would be your angle.
The vertical position is elevation and the horizontal position is in azimuth. The long crossing lines represent 0 elevation and 0 azimuth. Note the difference in the wide/narrow/left/right search patterns.
HAS you want to think of as an anti-radiation Maverick. I guess the details to know would involve the threat tables and selecting which from that table to show/hide. It’s the simplest mode really. See, lock, shoot. It flies straight to the target so avoid skimming the ground at a shallow angle.
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Sounds like you can git target slant angle from the harm seeker. And you know ac altitude. Should be able to trig the target range. Shrug…
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Besides, the RWR usually tells you if the SAM itself is in firing range or not (to shoot at you). If you know what its firing range is, you get a non-too-accurate but usually good enough idea of the SAM distance to your aircraft, so you know if you can shoot a HARM or not. It doesn’t work really well only with long-range SAMs, like SA-5s or SA-10s, which can outrange a HARM.
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frederf, yes you get spots in HAS mode in whatever azimuth, even in your six oclock, since the sensors can pick them up. But you can only shoot the HARM when its within 30 degrees azimuth which is the max offset that the HARM can be employed.
Final note, the HARM when shot, pops up so shooting while skimming isnt a problem -
Not in HAS it don’t. I think you are talking about HAD not HAS.
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check it if you want
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I’ve never checked if the HARM sensor in HAS is capable of detecting something right on 6 (180°), but there’s no doubt the sensor we have now in HAS can detect radars in the rear hemisphere. Bong’s right.
I tested it when I wanted to understand how to use the scales. -
I plan to do some testing later this week when I have time, but one question comes to mind. Do we know how well HAS is simulated in BMS? How close is it to the reality?
