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Aspis

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  • in reply to: Indian Air Forces – News & Discussion Part VI #2503593
    Aspis
    Participant

    Its very clear “India” is looking to the West for the MMRCA. So, I have to say the Mig-35 is extremely unlikely option at this point. Regardless, of the merits of the design. IMO

    If this is true, then the option isn’t just extremely unlikely, it’s out of the game.

    So one more less headache for our Indian enthusiast friends. You can start thinking about the rest. If this purchase is going to have a big political “colour”, most probably you can rule the Gripen out too. And it will come down between USA, France, Europeans.

    in reply to: Indian Air Forces – News & Discussion Part VI #2503600
    Aspis
    Participant

    To put it simply, the winner of your competition, will be, the aircraft that your goverment has the political will to buy and that is higher in IAF’s wishes (IAF will make sure to boost it).

    So, if your goverment for example, is uncertain between USA and say France, the aircraft will be the one that IAF will most “push”.

    Say your goverment wants 100% to buy American and IAF between the 2 US aircrafts wants the F16 (example). Then IAF, will make sure in the evaluation criteria to boost the F16 over the SH. So your goverment is happy, IAF is happy.

    If IAF ranks say 1st F16, 2nd Rafale, 3rd Mig and your goverment wants to buy either French or Russian, the goverment will boost the criteria that SHE controls and make sure the F16 comes second and the Rafale 1st. And so you will buy Rafale. Your goverment is happy and IAF will get her 2nd best choice.

    in reply to: Indian Air Forces – News & Discussion Part VI #2503601
    Aspis
    Participant

    excellent post Aspis.

    I did ask, very recently, a serving IAF Mirage-2000 squadron leader about what he would think the best MRCA candidate should be and I fully expected him to support the Rafale (because this guy loves the Mirage-2000)..but he said, from a pilot’s POV, that for the majority of the IAF pilots, any MRCA fighter will be good enough and they’ll make the best use of it. 🙂

    That’s exactly the job of the pilot. To fly the best he can, with what they give him. And all the candidates, are fine aircrafts. Simply, there is the pilot, who does his job, which is to fly and there there is the higher ranking IAF authorities, that will take the input and reports from the pilot opinions and according to their planning, boost the best choices for IAF’s needs.

    Whatever you buy now, isn’t a “standalone” decision. You already have various aircrafts and future projects. So each selection, is made with also that in mind. So, if you don’t get the no.1 interceptor now, that’s probably because you don’t really need now (because of Su and PAK FA). If you get something “lighter”, is because IAF’s plans think that the more “heavyweight” class will be covered otherwise and so on.

    In HAF, if you ask pilots, each of them has a preference. But, those that actually determine which criteria will be more boosted, are those in the higher ranks, behind the desks. This may look less romantic, but those behind the desks, are actually those who have the job of planning, not flying. So, unlike pilots, the “desk men” must plan number of aircrafts, do a bit of math with the predicted budgets to see the type of aircraft that in the near future will require increased number, which older aircrafts and when must be retired and so this must also be taken in consideration, how much the weapons will cost and then put it all together for the importance factors of the criteria list, which as i said, WILL boost those that the airforce thinks as more adeguate.

    Because, if you ask a 25 year old pilot “which aircraft in absolute would you wish for?”, he most likely would tell you “I want us to buy F22!”. But, an airforce of 300 aircrafts, can’t have 300 F22s… This is where’s the job of the “desk men” comes into play. They have to take pilots secret wish and see how it complies with the more “material” needs of the airforce.

    And at the end, the pilots will love the aircraft you will give them, because at the end, they also know, that an airforce can’t make everyone happy and that each aircrafts has a role in a wider design.

    You don’t know what IAF’s high rank staff is planning. But THEY know and they WILL boost the candidates that THEY prefer for IAF’s needs as a WHOLE and according to the forseable PLANS. 😀 Once you KNOW what your preferences are, there is really no reason not to take in the competition even the F4E “resurrection” if this makes the competition harder and the prices go down and your goverment happy… Same goes for your goverment. Your goverment probably has 2 “top dogs”. The fact that others can enter the competition, who your goverment isn’t willing to give the contract, isn’t a problem, because THEY WON’T WIN. They are simply there to increase the competition and give India better bang for buck.

    in reply to: Rafale news VI #2503622
    Aspis
    Participant

    Most AtoA kills occur with the target not knowing he was targeted until it was to late. It’s the 1st rule of AtoA.

    And most of the time the fight won’t be pure fighters combat, but a fighter intercepting a plane which has its own mission. Most likely strike.

    Nic

    To tell you the truth, i doubt that one really knows how A2A kills occur in a real war and modern aircrafts/BVR missiles/EW suites. By real war, i mean where USAF isn’t the one of the 2 parts and the opponents have similar capability/resources.

    That different packages will the crossing each others path, it’s sure.

    in reply to: Indian Air Forces – News & Discussion Part VI #2503628
    Aspis
    Participant

    The americans will probably say no. When all is said and done is another matter entirely. I doubt you can trust them on that one.

    Nic

    I know. The Americans have interest to say “sorry, only if you buy american”. If they lose the tender, then maybe they will think “Mmmmh, oh well, selling the HARMs and letting them integrate it is better than nothing”.

    But, get into the shoes of the Indians… This is a risk for them. It’s about guessing the intentions of the Americans.

    If i were in the evaluation team of the Indians, i would give a higher score in the “antiradiation missile” criteria of the list for the US aircrafts than with the Rafale. Because for the Rafale it becomes a risk, that even if it is a calculated risk, you can’t say “ok, Hornet antiradiation missile score: 100, Rafale: 100”. You will put Rafale: 70.

    in reply to: Rafale news VI #2503631
    Aspis
    Participant

    Well it would be counterproductive to change speed up and down… what a waste of energy. The plane will not change speed unless changing attack profile, or upon noticing he is targeted, which isn’t happening unless he sees you on radar or on his optronics. Accelerating and braking will consume way too much fuel.

    True, true, i only mentioned it theoretically. Say he knows that capability of yours, he has been aware of your presence and decides to start manouvering more.

    Besides, you can keep making “snapshots” even after the Mica has been launched, and you could send a mid course update only if the target data changes… which wouldn’t compromise you unless he has noticed something.

    Of course.

    Speed doesn’t count if he’s going right at you or right away from you. If you are going to send a missile 50 km away at a speed going 90° from you, you have to send your missile towards the place he is going to be, and not in his direction. You won’t know where he’s going to be if you don’t have an idea of his speed.

    True. But most of times, he will be coming towards too, to shoot you too. In a 90 deg course, guiding the MICA will become much more difficult as you say, because the speed will have more influence. But it will also become harder for you to get accurate speed.

    I’m no expert but the way I see it there are two drawbacks of using update link as opposed to sending our missile in the right place.

    1, updating course will waste energy and hence have a hit on the max range of your missile (energy loss in the manoeuver + eventually the longer distance to the target).
    2, the mid course update could be detected by the target and give away the fact that he’s being attacked.

    So if the target doesn’t change course or speed drastically it’s better to not send mid course update if your track data were accurate enough.

    Nic

    I agree. I mentioned the update, for the scenario that you want to be sure that the MICA won’t go astray. For example, if you go to BVR, it’s unlikely that the enemy will turn at 90 degress to your course. Most probably he will try to come closer to you so to shoot. Even if he does see you and know what you can do, most probably he won’t turn 90 deg, but he may periodically do some altitule and course slight variations, enough to hope to get out of MICA’s FOV, unless you send an update.

    There is no 100% foolproof solution as i see it. You may have no need for an update, you may have to. Much depends on your knowledge on how sensible the MICA’s IIR seeker at every distance and how wide its FOV is. I would imagine that its FOV is much bigger than that of an EM seeker.

    BTW is it possible for the pilot to allow or refuse the mid course update according to the situation?

    I don’t know for sure, but i i suppose you ‘re not bound to make the mid course update. I mean, let’s say you don’t. Most likely the missile will keep flying towards the original coordinates and eventually turn on its own seeker. What’s it going to do, send you back a message “Hey, what about me! I was expecting your phone, you didn’t call!” 🙂

    in reply to: Indian Air Forces – News & Discussion Part VI #2503632
    Aspis
    Participant

    Then get the F35 directly and don’t waste the $$$ on the viper… it’s old news.

    It’s basically the same for India and us. Theoretically speaking, it’s what Ante Climax said. HAF would like something before 2014, as “gap filler” solution to get rid of the A7. To us, Dennis Plessas, the LM campaigner, said that we could START with deliveries of F35 in 2014, but of course in order to conclude them, it would take years,so LM proposes the F16 again… as “the most natural thing”. 😀

    Mind you, the 2014, was said, if there is absolutely no delay in the F35 schedule. A more recent article i read (don’t remember details), was saying something about 2015 for another customer (not Greece), being available. If you add potential “youth” problems/ “bugs” that the first blocks are likely to have… at the end to have a fully operational squadron without any hickups in any system, will take more time. For example, we are getting the last F16 batch. The self protection suite isn’t the same as the older 52+ batch. It’s a new one, and there are some problems that may delay its integration and maybe the final acceptance from HAF. Similar delay there was in the acceptance of the M2000-5. The place was fine, but the EW suite was a new one, and wasn’t working “out of the box” in 100% of the theoretical contract requirements. So there was delay.

    It’s not that if you get something previously untested in 2012, it is 100% guaranteed that it wil be working in 100% of the supposed brochure requirements in 2012.

    As you say it’s hard to say. The Rafale being the only plane in the AdlA and MN… surely it has all the weapons they think they would need. Same with the Gripen. Typhoon is another matter as most customers are on the JSF boat so visibility of T3 is quite blurred.

    I am not saying that what you say is irrational. Simply you and i don’t know what IAF’s view on the subject is.

    Maybe but not necessarily true. A few years down the road I doubt they would bark at the opportunity to sell a juicy weapons package… I really doubt it.
    Besides a Rafale with ALARMS would sure look good.

    Nic

    True, true. This is something that the Indians should look into BEFORE choosing. For example, ask the Americans, if they would be willing to allow the sale of HARMs/any other missile to IAF , so that IAF can later integrate it to whatever aircraft she wants.

    in reply to: Rafale news VI #2503642
    Aspis
    Participant

    That’s exactly what I had in mind actually… and with successive snapshots you can even get the speed of the contact. Surely the processing power required wouldn’t be greater than the one you need to analyse the radar data.

    Nic

    Yes. If the target doesn’t change speed and you can get very accurate range by stadimetric-like processing, you can get accurate speed (Velocity= Space covered at constant speed/Time). But i am not so sure if you can get so precise ranging. And what if the enemy is accelerating or he is manouvering so his speed is going up and down.

    But his speed doesn’t count all that much if you know his range. If he is well inside the envelope of the MICA, you can even assume he is going with Mach 2 in the worst case. Even if he sees the MICA and tries to turn around, he won’t be able to do it, if you have fired with in mind that he may be at Mach 2 (he can’t go Mach 3). If he has even lower speed, then the problem doesn’t exist.

    In any case, you need to send an uplink to the MICA to update the tracking data. So if you are able to update the course of the MICA from time to time to the correct heading and updated range and the MICA’s IIR seeker gets activated , then speed isn’t an issue anymore. The MICA’s IIR seeker will have homed into the exhaust and speed becomes irrelevant. All you need is basically have the MICA with a good enough heading, to allow the enemy to still be inside the MICA’s FOV when the MICA will go autonomous.

    in reply to: Indian Air Forces – News & Discussion Part VI #2503645
    Aspis
    Participant

    I’m tired of hearing two things.

    1, That the F16 would pave the way for the JSF (how ludicrous is that?). The US will be more than willing to sell the JSF to india when the time comes whether it purchases the F16/18 or not. What kind of a silly argument is that?

    This is LM motto. It’s the standard campaign argument. They say the same to us. “Buy once more the F16 now and the F35 in the next order. It’s the most natural thing in the world to do”.

    2, That the US fighters can use all those weapons. Realistically, how many weapons does an air force need to pursue efficiently all of its inteded roles? Okay many weapons are integrated on the 16/18, but that doesn’t mean all of them would be needed to have an efficient strike capability, nor does it mean India or some other customer would need to use all of those. There are many weapons to chose from, but many of those are redundant and it’d be counterproductive too many of them.

    India doesn’t need ALL the availble US weapons. But what would like, it’s up to IAF… It depends on how many aircrafts the IAF wants to dedicate to each role in case of war, what type of targets they want to strike and how much $ they are willing to spend for payload for each type of target, according to its importance and defence. It’s very complicated to say.

    Besides the weapon integration is not all that important if competitors, like for instance the Rafale consortium, are ready to give full ToT, which means the indians could integrate pretty much any weapon they wanted themselves at the fraction of the cost.

    This is true, but, they still need approval of the missile vendor, don’t they? For example, if they buy Rafale and they want to integrate HARM on it, can they do it, without the consensus of USA?

    in reply to: Rafale news VI #2503648
    Aspis
    Participant

    And if you have the radar beam turned off, there’s plenty of processing power to run these fancy programs 🙂

    Yes. But i don’t think that the ranging will require all that much processing power really. The principle is quite simple. Basically, the simplest of all, is to have the enemy flying horizontally (because if he isn’t it becomes more complicated). Then you can have the software take a “snapshot” of him. Measure the “height” of the enemy aircaft from bottom to top. Correlate this with the info of the particular aicrafts data which is in your Rafale’s database. Eventually correlate this with the zoom factor and it’s done.

    A more advanced scenario, would be to have an electronic library with the 3d model’s dimensions of the enemy aircraft. Having the 3d model, you can even compare the image with that of an aircraft manouvering (the software can make the 3d model rotate until it adjusts to the enemy’s profile at the time of the snapshot). Take 3 successive snapshots for more reliability and let again the processor compare with the 3d model’s data and give you the range. This requires more processing power.

    Aspis > The OSF-NG is a future upgrade, not funded yet, but with TV, IRST and LRF.

    For 2012, it will be the OSF-IT with only the TV, and, i think, the LRF (included in the TV channel).

    The AESA do not steal the OSF’s room.

    Oh, sorry. I was confusing the IT with the NG. You sure plan very far ahead. One can’t catch up with you easily. 🙂

    I made the hypothesis about the OSF , because it’s all crowded in front of the cockpit area. I am not an expert in the way the various systems are allocated in the Rafale or the space they require, so never mind what i say. :p

    in reply to: Rafale news VI #2503669
    Aspis
    Participant

    It’s on the higher level magnification, yet is about the same size in the frame. Don’t want to give away all the secrets…

    I have seen that too. My explanation is that the Rafale was tracking the aircraft and these were 2 shots in 2 different moments, from 2 different distances, both at about the same angle (close to 90 deg). Note that the elevation in the 2nd photo is different (the aircraft isn’t perfectly centered on the display like in the 1st).

    @Aspis… I seriously doubt the laser RF functionality will be taken away.

    I hope so! Since no french poster replied, i thought it was an implicit admition of it being removed.

    For one, the hardware doesn’t really have much to do with the IRST/CCDs – I’d think it uses a dedicated means to detect the reflection, not blinding the OSF. In any case, it’s obviously playing a major part in the AdA’s operating procedure for Rafale, it makes no sense to remove it.

    In deed, even if you remove the IRST, the laser could still do the same job with the CCD. So i ‘d keep it. Unless the new OSF NG has problem to fit in with the AESA being added too, so in order to make space, they will start removing anything they can. I hope not!

    About the stadimetric thing, I wonder how much the accuracy could be increased by statistical combination thru L16…?
    Spectra is said to increase it’s own accuracy by sharing data from multiple platforms (triangulation, etc), visual analysis would just add another completely passive input. And it’s not like 100% accuracy is needed to get a missile lobbed in a good-enough trajectory that it’s on-board seeker can compensate.

    You said it. Triangulation. Probably if you have some Rafales flying towards the target from another angle, they could all use stadimetric ranging, then use the link 16 to share their range data and get a more accurate range (a sort of middle value between the Rafales. 1 sees 40km, another sees 43km, another sees 50km, the medium becomes 44km). Integrate that with a possible Spectra track and you get even closer to the real value.

    in reply to: Rafale news VI #2503670
    Aspis
    Participant

    And correct me if I’m wrong on this, but even assuming a laser RF is used and detected by the opponent’s LWR, that doesn’t give the opponent directionality, much less range (though it let’s them know they might as well turn on their radar). Though I’d assume any technique allowing laser directionality to be inferred from a one-point intercept would be extremely desirable for this reason…

    I think so too. I don’t see how a laser detector can function as well,a RWR, with precise direction indication. As a matter of fact, i am not even 100% that the laser detection is 100% waterproof and covers every spot of the aircraft. But i don’t know where these sensors are positioned and how they work, so only a doubt.

    But I definitely like the 6 Mica air-air load… It just seems a false economy in a certain sense to equip short-range-only dogfight missiles, that although cheaper than Mica, displace pylons and require you to enter range where you’re on equal footing with your opponent (assuming signifigant opposition who will have HMS + HOBS). Obviously using Mica as a dogfight missile is much less efficient cost-wise, but the idea is that you CAN do so if forced to, but don’t have to compromise your # of BVR shots with dedicated dogfight missiles. Losing a plane & pilot is much more expensive than a Mica, and entering dogfight range with an opponent who’s not completely out-classed seems like odds I’d prefer to avoid completely.

    It’s all about $ my friend. If you have the $, it’s always best to fly with as much MICAs as you can. In deed. You have the $? You integrate a HMD with MICA IR and you always take off with a full MICA load and later with a full Meteor an MICA load and you ‘re ready for everything. The problem comes when you can’t afford to pay all the $ required.

    I agree an IR version of Meteor, or better, a dual IR/EM seeker (/Ladar?) would be very effective.

    I don’t know if they can fit both seekers on it, but it would be very difficult to dodge. Already IR airborne jammers, have many problems. It’s easier to build EM jammers that work effectively.

    in reply to: Rafale news VI #2503672
    Aspis
    Participant

    To give a better idea of more stadimetric applications.

    This is an M72 LAW (old anti tank) scope scheme:

    http://en.wikipedia.org/wiki/File:PVS-4-reticle-m72.jpg

    1,2,3, mark 100,200,300 in meters. Since the distance of the enemy tank couldn’t be that far to worry about huge calculation error, the 2 vertical lines in left and right, were made according the medium dimensions of the soviet tanks. Meaning, when the 2 edges of the enemy tank were touching the 2 lateral lines of the scope, you could read (more or less accurately), the distance.

    So, if the enemy tank, was touching the 2 lateral lines at the level of 1, it was at 100 m. If its shillouette was touching the lines between 2 and 3, it was at 250 m.

    Yes, it wasn’t perfectly accurate for ANY enemy tank or APC (since it was based on an averaged size soviet tank and not for EVERY tank) , but since the engaging distance wasn’t that much, the error wasn’t important.

    in reply to: Rafale news VI #2503674
    Aspis
    Participant

    Very interresting OSF picture.
    “16.5 nm silent” it seems that it is a ranging estimation gets without using the laser rangefinder.
    Interrestingly, there are 2 more magnification levels.

    It is funny that the ranging info on the 2nd image has been blured.

    When i had first seen this and noted the “silent”, i presumed it was referring to “passive interception”. Silent as “without radar emission” (using the laser for range). Or that it’s a “passive” sensor in use.

    Otherwise how can you calculate the range? (stadimetric method not being incorporated yet).

    Never matter. What i really don’t understand, is why would you want to remove that ability if in deed it’s the laser doing such a fine job.

    in reply to: Rafale news VI #2503681
    Aspis
    Participant

    But I just can’t figure out how comes you can’t tell the range from the size of the 3D shape of the opponent. If you can identify it you know how big it is, so judging how big the image is on your osf at given magnification should give you its size. Devising an algorithm to calculate it should be hard. Isn’t it the ways submarines get the range of the ships in periscope view?

    Nic

    About periscopes. Nowdays, it’s done all by sonar, you hardy use the periscope. But yes, in WWII when you were relying on the periscope to attack, the periscope was using stadimeter.

    http://en.wikipedia.org/wiki/Stadimeter

    Basically, you needed to identify the type of ship and feed it to the “computer”. Then you had to measure from within the periscope, the distance between the waterline and the highest part of the ship. Since each type of ship had known height, the computer could calculate the distance and use it for the firing solution , together with angle on bow and target speed.

    Probably it can be done theoretically, if you develop an algorithm to do that. If you have fed on the computer database the 3d model of the aircraft, maybe it could be done. The problem is i suppose that having high speed, the enemy could reduce the distance very fast and make you miscalculate. Because the ships, were usually slow and attacked by submarines while unaware of their presence.

    Even if you do make such an algorithm, the problem remains, that you can shoot , but the missile’s seeker still can’t track the target yet by its own. So, you ‘d have to do something like this to correct course:

    – Get an approximative distance (+- 10 km accuracy for head-on shouldn’t change much, even if he accelerates or decellerates) with a stadimeter-like way from the IRST or camera. If you are SURE that he is well inside the envelope of your missile (to compensate for the possible range miscalculation), use that distance and fire. As you get closer, switch on the radar and sweep the targer, update tracking data to your missile which is still in flight, wait and let the missile do its job.

    A bit complicated, but probably doable.

    The case becomes much more complicated, if you are approaching the enemy from the side. If he changes his speed much and you have done a bit range error, the missile will be flying way off course. Putting it back to course may be too difficult later.

Viewing 15 posts - 871 through 885 (of 938 total)