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bmwf1kin
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 Posted: Mar 22, 2004 - 12:24 PM
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It seems like more and more aircraft are going to be fitted with active electronically scanning array
Eg. F-16 block 60, JSF, F-18 E/F, rafale and many more. So I try to find out more about the difference between AESA and PESA. But all the information I get was too technical and complex for easy understanding.
Can somebody tell me what is the main difference between them in simplfied form. Thanks  |
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 Posted: Nov 18, 2008 - 5:40 PM
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F-16.net Sponsor
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habu2
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Posted: Mar 22, 2004 - 04:03 PM
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Elite 2K
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| Sorry, what does the P in PESA stand for? |
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JanHas
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Posted: Mar 22, 2004 - 04:51 PM
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Probably for Passive.
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habu2
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Posted: Mar 22, 2004 - 04:56 PM
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| By definition I don't think a radar set can be passive, especially ESA. I was guessing Programmable but that seems somewhat redundant. |
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JanHas
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Posted: Mar 22, 2004 - 05:05 PM
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The B-2 Spirit has an passive radar, I believe...
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Habu
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Posted: Mar 22, 2004 - 05:10 PM
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F-16.net Moderator
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bmwf1kin wrote:
So I try to find out more about the difference between AESA and PESA. But all the information I get was too technical and complex for easy understanding.
Like what? |
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habu2
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Posted: Mar 22, 2004 - 07:24 PM
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from http://www.airforce-technology.com/projects/b2/
Quote:
The Raytheon AN/APQ-181 covert strike radar, operating at J-band (Ku-band), is a multi-purpose radar with terrain following and terrain avoidance modes. Testing at Edwards Air Force Base has demonstrated reliable terrain following at altitudes down to 200ft.
In November 2002, Raytheon was awarded a contract to develop a new Ku-band AESA (active electronically scanned array) antenna for the B-2 radar to avoid interference with commercial satellite systems after 2007. Installation of the new antenna on the B-2 fleet is to be completed by 2010.
My understanding is the only way a radar can be truly passive is when it acts as the receiver in a bistatic radar pair - kind of like buddy-lasing. Otherwise the radar must emit or there is no reflected signal to be received. Many of these new radars (like the APQ-181) only emit for very small spans of time and in very focused directions, making them very hard to detect but that does not make them passive. |
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bmwf1kin
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Posted: Mar 23, 2004 - 10:53 AM
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habu2
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Posted: Mar 23, 2004 - 03:19 PM
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Well I understand most of what he is saying in that article but trying to explain it would require a dissertation in radar design. Notice his reference to Passive ESA is described as 'notional', meaning it is just an idea right now. He is basically talking about controlling the radar beam with MEMs rather than the current active elements in the array. What he is really talking about is applying the new technology of DMDs in the DLPs used in new high-end televisions. See this link for an article on DLPs and use your imagination to apply it to a radar...
http://www.audioholics.com/techtips/spe ... logy2.html |
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elp
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Posted: Mar 23, 2004 - 05:15 PM
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habu2
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Posted: Mar 23, 2004 - 08:32 PM
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elp, you doubting my 'logic' ???  |
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elp
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Posted: Mar 23, 2004 - 08:42 PM
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I consider myself educated / updated on the latest avionics tech when I go into an appliance super store.  |
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bmwf1kin
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Posted: Mar 24, 2004 - 06:00 AM
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Joined: Feb 26, 2004
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| Thanks a lot guys for all your replies, but I think it will take me a few more years of practises before I can truly understand |
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