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#11
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On Tue, 18 May 2004 20:20:21 -0400, Yeff wrote:
On Wed, 19 May 2004 00:57:56 +0100, phil hunt wrote: What is "silent sentry"? From http://www.dtic.mil/ndia/jaws/sentry.pdf The heart of Silent Sentry is its innovative Passive Coherent Location (PCL) technology developed by Lockheed Martin Mission Systems, which uses everyday broadcast signals, such as those for television and radio, to illuminate, detect and track objects. Just like the celldar system from Roke Manor then... cheers A passive detection system for U.S. government civil agency and military purposes, Silent Sentry transmits no radio frequency (RF) energy as conventional radar does and has no RF "signature" to alert enemy threats. Instead, it can use the energy that already exists in airspace for detection purposes, and does not adversely affect or harm the environment. |
#12
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On Tue, 18 May 2004 17:26:58 -0400, "Paul F Austin"
wrote: "David Pugh" wrote "Scott Ferrin" wrote "They never get into dogfights, so it makes no difference," Secretary Roche said. "The fact that (the Raptor) flies very high, very stealthy and at (Mach 1.6) without afterburner makes it very tough for anybody else to have a fire control solution. The F-15s, with very good radars, were not able to pick up and understand where the F/A-22s were, and the F/A-22 was looking at the F-15s all the time." I wonder how it would do against Mig-29s with their IRST? It probably wouldn't make much difference (even if the Migs knew where the F/A-22 was they probably couldn't get a missile lock) but it might make for a more realistic test. People are missing something here. M1.6 and high altitude for long periods makes it difficult for_any_fighter to get a fire control solution, regardless of detectability. Or at least that's what some of the fighter drivers said here about doing (or trying to do) intercepts on MiG-25s some years back. Not to mention the SR-71 :-) Twice as fast as the Raptor, four miles higher. . .forty years ago. The envelope for a successful intercept is small and once the nil detection range for fire control radars gets folded in... Compare the "average interceptor" these days with the "heavies" and it skews it even more. The Mig-31 and F-14 were both designed with big radars, big missiles, and fast to boot. Let's see an F-16 or Rafale lug a thousand pound AAM up to Mach 2 or better. I'd be interested to know how well a missile like the AIM-120 or your typical dogfight missile would fair at 65k to 70k feet altitude. Most missiles designed to do much manuevering at high altitudes have (had) bigger wings to deal with the thinner air. Just look at AA-6, AA-9, Phoenix, AIM-47, SA-5, Nike Hercules, and so forth. The "upper-right" corner of the envelope became less and less in vogue over the years so it wasn't that big of a deal but now you have everything geared to hit aircraft flying below 50k for the most part. Makes me wonder what kind of effect it has overall. Probably not much in the big picture I would guess since there never will be huge numbers of Raptors but still I wonder would even the latest AIM-120 have had much luck against an SR-71 It's all very well to apply handwavium multistatic techology that you just happen to have in your hip pocket but how are you going to guide a weapon using it? Inquiring minds... |
#13
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Just like the celldar system from Roke Manor ...
Which is a subsidiary of German electronics giant Siemens. |
#14
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The heart of Silent Sentry is its innovative Passive Coherent Location
(PCL) technology developed by Lockheed Martin Mission Systems, which uses everyday broadcast signals, such as those for television and radio, to illuminate, detect and track objects. BTW (West) Germans were first to devolop a multi static detection and tracking system in 70s .Even before Firefly!. |
#15
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Just like the celldar system from Roke Manor then...
Roke Manor (Siemens) system is optimized aganist stealth aircreaft at medium altitudes,whereas Silent Sentry is also very effective aganist next generation stealthy cruise missiles that employ terrain masking in addition to stealth. |
#16
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John Cook wrote:
Just like the celldar system from Roke Manor then... Looking for a hole in the air that's quieter than it should be, right ? |
#17
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"Paul F Austin" wrote:
It's all very well to apply handwavium multistatic techology that you just happen to have in your hip pocket but how are you going to guide a weapon using it? Inquiring minds... Home On Silence targeting ? (hahaha) |
#18
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It's all very well to apply handwavium multistatic techology that you just
happen to have in your hip pocket but how are you going to guide a weapon using it? Inquiring minds... You can kill easily any stealth bomber that you can detect,track and even image for ATR purposes at long ranges, even a F-86 can do the job easily. But the real beauty of multistatics is the ability of tracking targets without alerting them. Also completely passive nature of tracking makes receiver/processor units,by far the most expensive part of any multistatic system,virtually immune to HARM type type attacks. |
#19
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"Denyav" wrote in message ... It's all very well to apply handwavium multistatic techology that you just happen to have in your hip pocket but how are you going to guide a weapon using it? Inquiring minds... You can kill easily any stealth bomber that you can detect,track and even image for ATR purposes at long ranges, even a F-86 can do the job easily. But the real beauty of multistatics is the ability of tracking targets without alerting them. Also completely passive nature of tracking makes receiver/processor units,by far the most expensive part of any multistatic system,virtually immune to HARM type type attacks. Nope it just puts civilian transmitters on the target list. Keith |
#20
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Nope it just puts civilian transmitters on the target list.
and turns your target list into a thick "target book" even if we assume that planes could safely reach HARM firing range while they tracked continously by their opponents.(not very likely). BTW you must also shut down or bomb your own transmitters too,military or civilian, for the best results !. Good Luck. |
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