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spazsinbad
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 Posted: Oct 31, 2011 - 05:20 AM
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Elite 3K
Joined: May 05, 2009 - 10:31 PM
Posts: 4616
Location: OZ
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Regarding future AWACS and above...
Help coming for AWACS in a J-20 era? By Stephen Trimble on October 24, 2011
http://www.flightglobal.com/blogs/the-d ... a-j-2.html
"The Boeing E-3A airborne warning and control system (AWACS) is like the binoculars of a fighter formation. By emitting a 3GHz electromagnetic pulse, the E-3A's Northrop Grumman APY-2 radar can spot an inbound fighter at 30,000ft as far as 430nm away. But what if the fighter is stealthy, which means partly that its designed to scatter radar waves in any direction except back to the source?...
...Technically, it's called bistatic target detection. It basically means one aircraft -- in this case, the E-3A -- emits the radar pulse, and the returns are detected by radar receivers operating passively on one or more other aircraft. So the stealthy target scatters the radar waves in different directions, but it still can't hide...."
Then some stuff about UAVs being those detectors instead of F-series. |
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Sponsor
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 Posted: May 26, 2012 - 11:08 PM
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F-16.net Sponsor
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tacf-x
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Posted: Oct 31, 2011 - 06:49 AM
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Senior member
Joined: Sep 17, 2011 - 03:25 AM
Posts: 386
Location: Champaign, Illinois
Status: Offline
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| Why UAVs? Didn't SpudmanWP say they lacked the band width to be doing large amounts of triangulation work like this? |
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SpudmanWP
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Posted: Oct 31, 2011 - 07:04 AM
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Elite 3K
Joined: Oct 12, 2006 - 08:18 PM
Posts: 3321
Location: California
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| It would work IF the location and timing of the radar pulse could be encoded within the pulse itself. That way the UAV (or F-35, F-22, etc) only needs to calculate the reflection point based on direction and timing. Bandwidth is not needed for the calculation, only for transmitting any findings back to the rest of the network, which does not require a lot of bandwidth to do. |
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"The early bird gets the worm but the second mouse gets the cheese."
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popcorn
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Posted: Oct 31, 2011 - 09:37 AM
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Elite 1K
Joined: Sep 24, 2008 - 09:55 AM
Posts: 1179
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| Not that I expect any firm answers but anyone care to guess how much EM stealth is due to shaping and how much from RAM? |
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wrightwing
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Posted: Oct 31, 2011 - 03:53 PM
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Elite 1K
Joined: Oct 23, 2008 - 04:22 PM
Posts: 1741
Status: Offline
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popcorn wrote:
Not that I expect any firm answers but anyone care to guess how much EM stealth is due to shaping and how much from RAM?
The vast majority is from shaping. The RAM just helps minimize the signal strength of any EM that is reflected. |
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