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#161
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#162
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In message , phil hunt
writes On Thu, 18 Dec 2003 22:25:54 +0000, Paul J. Adam news@jrwlyn ch.demon.co.uk wrote: Getting a machine to tell a T-72 from a M1A1 from a Leclerc is hard enough in good conditions You don't have to. You have to be able to tell whether it's a vehicle or not, and if it is, is it in an area likely to be occupied by own forces. #1 sounds easy until the enemy starts deploying decoys and disguising targets. #2 still requires not only significant navigation, but some noticeable amounts of real-time intelligence gathering and communication. _Someone_ has to reliably determine whether the 'US tanks to our front!' message is a feint, a hasty raid or the real invasion; work out where those tanks will be by the time the missiles arrive: and reliably get a message back to the launch unit. This has to be reasonably proof against deception, EW, jamming, and blunt attack. More to the point, it rules out most resistance and makes life for refugees short and nasty, since "general area of enemy forces" will contain both own forces trying to fight (unless these missiles are your only resistance) and civilians fleeing. : doing so in the presence of camouflage, obscurants and when the crew have run out of internal stowage (so have hung lots of external gear) and maybe stored some spare track plates on the glacis front ('cause they need the spare plates and they might as well be extra armour) gets _really_ tricky. Do you err on the side of "tank-like vehicle, kill!" or "if you're not sure don't attack"? I'd tend to err towards the former. note that it's a lot easy to spot a moving vehicle than a stationary one. Own forces retreating and fleeing refugees make equally good targets. Of course, you can implement "this way = friendly, that way = enemy" logic, but then if the US is retreating or your own forces advancing when the missiles arrive... Would it not be embarrasing to have a successful armoured raid broken up by your own missiles? Indeed. Maybe some form of IFF? If you can get the IFF feature robust, reliable and not compromising own forces for under $10k per missile, let everyone know! Key problem is that going up against the US loses you your comms and observation I doubt that that is true, assuming a competent comms network. Landline telephone need landlines and exchanges, easily targeted. Cellular telephone needs masts and repeaters, ditto. Broadcast radio is vulnerable to jamming, eavesdropping and spoofing (or simply "bomb the emitter". A comms infrastructure that is robust, secure, and prompt is not easy even for the UK or US to guarantee, let alone a Third World nation under attack by opponent(s) with air superiority. DR is patchy at best unless you've got good inertial guidance systems (non-trivial). Celestial only works on clear nights Or during daytime. And if it's cloudy? Or can you only fight in good weather? - so you're limited to fighting wars after dark on cloudless nights with no flares in the sky. LORAN is a radio broadcast and therefore not survivable against a US-style opponent. If you have lots of transmitters, many of which are dummy transmitters, and many of which are only turned on for a short time, using frequency hopping, it's rather harder to destroy the network. You'll run out of transmitters before the US runs out of weapons. LORAN needs _large_ transmitters and that makes it a lot easier to simply blast everything that looks like a LORAN station. -- When you have to kill a man, it costs nothing to be polite. W S Churchill Paul J. Adam MainBoxatjrwlynch[dot]demon{dot}co(.)uk |
#163
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In article ,
Charles Gray wrote: I don't think anyone expected such a collapse-- most serious predictoins I read expected a fairly easy field war, followed by some ugly city fighting, as Saddam tried to suck the U.S. into a Berlin style slugfest. I made some fairly optimistic predictions on the order of the ground campaign taking as little as six weeks, and people thought that was just silly... -- cirby at cfl.rr.com Remember: Objects in rearview mirror may be hallucinations. Slam on brakes accordingly. |
#164
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Paul J. Adam wrote:
phil hunt writes Paul J. Adam wrote: Getting a machine to tell a T-72 from a M1A1 from a Leclerc is hard enough in good conditions You don't have to. You have to be able to tell whether it's a vehicle or not, and if it is, is it in an area likely to be occupied by own forces. #1 sounds easy until the enemy starts deploying decoys and disguising targets. They have to deploy good-enough decoys forwards with the advancing troops. Consider for a moment how hard it would have been for the US to get significant quantities of good decoys forwards of the Kuwaiti border by T+4 hrs. #2 still requires not only significant navigation, but some noticeable amounts of real-time intelligence gathering and communication. A kill box from thirty kilometers north of the Iraqi border with Kuwait, going twenty kilometers south of that border, by T+4 hrs after the US Army breached the border, nine months ago, would have worked quite well. _Someone_ has to reliably determine whether the 'US tanks to our front!' message is a feint, a hasty raid or the real invasion; work out where those tanks will be by the time the missiles arrive: and reliably get a message back to the launch unit. This has to be reasonably proof against deception, EW, jamming, and blunt attack. A massive invasion, and anything of regimental strength or more is going to count, is hard to hide. The details of how far and how fast the front line has moved may be more opaque, but any serious attack has very real limitations on how fast it can roll out. One can easily posit kill box limits which are very easy to justify and will suffer very little blue-on-blue for the defender. And more to the point, will do far more damage than any remaining defender forces in those boxes, and the oncoming attack will presumably wipe those forces out promptly. The timing and positioning of the box may require not targeting your own FEBA of effective resistance, and not targeting the leading invasion echelons. But that doesn't matter. It took days for the US forces to finish crossing the border into Iraq. Kill boxes with the description I gave would have been valid for much more time than is needed to set up and execute the cruise missile attack starting. More to the point, it rules out most resistance and makes life for refugees short and nasty, since "general area of enemy forces" will contain both own forces trying to fight (unless these missiles are your only resistance) and civilians fleeing. This depends on the geography. Not many Iraqi civilians were in the kill boxes I specified above. [...] I doubt that that is true, assuming a competent comms network. Landline telephone need landlines and exchanges, easily targeted. Cellular telephone needs masts and repeaters, ditto. Broadcast radio is vulnerable to jamming, eavesdropping and spoofing (or simply "bomb the emitter". A comms infrastructure that is robust, secure, and prompt is not easy even for the UK or US to guarantee, let alone a Third World nation under attack by opponent(s) with air superiority. We have two types of communications that have to happen successfully, plus a decision loop. The reports of the invasion have to make it back to the designated authority over the missile firings. As stated earlier, it's very hard to credit any scenario under which it takes even twelve hours for a country to know the US has invaded. Then the leader has to make up his mind to fire some or all of the cruise missiles. Then the word has to make it back out to the missile sites. Even without good landlines, the word getting out to the missile sites doesn't have to be any more sophisticated than an emergency action message. A single code word, which shifts over time, may be enough. To suggest that the US can reliably disrupt significant two way communications is no leap. To suggest that we can reliably prevent *any* communications, even a broadcast one way message which can be very brief, is unrealistic. -george william herbert |
#166
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Derek Lyons wrote:
(George William Herbert) wrote: Even without good landlines, the word getting out to the missile sites doesn't have to be any more sophisticated than an emergency action message. A single code word, which shifts over time, may be enough. Yes, you are correct, many of these things are *conceptually* simple. But moving from concept to execution, even without the overkill practiced by the West, contains many hidden and non-obvious snags. For a 'simple EAM' to work, you need a system manned 24/7. If you don't want to do that, you need a reliable way of 'pre-alerting' your forces to stand-to. You need to securely create, distribute, and store the code words. (And an alternate supply of the same in case of compromise.) You need to procure, supply (spares), train, test, and maintain the individual components as well as the whole system. (And complicating the whole affair in many third tier nations are political issues.) It is doable, probably even on the cheap, but if you want a useful system you cannot skimp on the details. It's made a lot simpler by the operational environment; an ICBM strike really could come out of the blue, but a divisional strength US Army invasion is not going to suprise anyone. The 24/7 requirement only applies to known crisies. That said, you have to have the capability to operate on that basis, with those fundamental system capabilities and reasonable reliability. It doesn't need to be 100%, if you have tens of thousands of cruise missiles... some firing late is not going to be the sort of disaster that ICBM partial failures to launch on warning or partial failures to launch in a pre-emptive first strike would be. Doing it on the cheap is probably doable. Doing it on the stupid would leave it vulnerable to US breaking the command and control system down. -george william herbert |
#167
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#168
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What about a tripod launched cruise missle with a range of say less then
50km. You would only need one or two people to launch a missile this size, they could hide in a mosque or cave and fire it towards the yankee-imperialist *******s when in visual range (or if they have any intel from outside visual range). You could set the altitude at launch and approx distance to target (ie do not look for target until you have travelled 3km or whatever), this would prevent blue-on-blue - at least enough for them. The target could be acquired using cheap off-the-shelf digital equipment, we now have 5 megapixel digital cameras for less then 500 bucks, any bets on the price in a 2 years? 5 megapixels will pick out humans from kilometres away and convoys even further. Image recognition is not that hard, at least not for what we need. It only has to find a tank or truck, not tell us the make and model. When you have 100,000 missiles it doesnt really matter if only 10% hit targets. For supporting evidence of how far image recognition has come use some OCR software - it does a pretty good job of handwriting now, not bad for a computer. Also look to facial recognition software - the computer has to find faces in large, moving crowds and then find a match in a quick manner. Admittingly it doesnt work very good (doesnt stop silly govt.s thinking about buying it of course) but our system only has to find a face (tank, humvee, grunt). You could also set a target priority at launch to help prevent 300 missiles all going for same tank (ie this batch go for tanks, this batch for grunts and this batch for trucks, etc etc). You would still get overkill but again it doesnt really matter for our hypothetical despotic nation. Another problem raised was flight control for the missile. I dont think this will be an issue since we already have UAVs for less then 20,000k that can fly themselves and CPU power keeps getting higher. Today I saw that yamaha has a fully autonomous helicopter, I am no expert but a helicopter would be more difficult for a computer to fly then a missile no? So there you have it, a missile that can be cached around the country, small and cheap and potentially damaging enough to send the troops home (or at least make the invasion very embarrassing). Damo |
#169
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pervect wrote:
:I don't know the details of the system (one reason I'm free to post) - :but the absolute best case I can see is for you to force the US to :basically shut off the GPS system everywhere. Depending on your :weapons range, you may be able to force GPS nullification only in a :limited area (the US can probably scramble the timing when the :satellites are over the area threatened by your weapons, while leaving :the timing intact when the satellites are over "safe" areas. : enying the US use of GPS would have a negative impact on US military :capability, but it would not eliminate it. Denying the other guy use of GPS doesn't prevent the US military from using it. -- "Millions for defense, but not one cent for tribute." -- Charles Pinckney |
#170
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Bernardz wrote:
:Say I built heaps of multiple-rocket launchers built an improved WW2, V1 :jet to hit a city say at 200 miles and then targeted them at an US ally :cities. : :Aiming would be pretty trivial, most modern cities are pretty big anyway :and so what if a a lot miss? Its not like they cost me much anyway each :missile. : :My missiles shot down are a lot cheaper then the anti missiles the US :uses anyway. : :The make sure that this US ally is aware of your capability. That might :keep the US out of the conflict. You've got to build them somewhere. They have to launch from somewhere. Both of those 'somewheres' can be targeted and obliterated in pretty short order. :This strategy seems to work for the North Koreans. Well, no. What works for the North Koreans is a bunch of artillery and a huge army sitting poised to attack South Korea, whose capital is right up there by the border. IRBMs and nuclear warheads help, too. -- "Nekubi o kaite was ikenai" ["It does not do to slit the throat of a sleeping man."] -- Admiral Yamamoto |
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