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International Military News and Discussion
#23
[quote name='Austin' date='31 January 2010 - 08:43 PM' timestamp='1264950324' post='103825']

Arun , one of the idea proposed is to use L band T/R module on wings and Tail







Check this link for more details [url="http://www.ausairpower.net/APA-2009-06.html"]Assessing the Tikhomirov NIIP L-Band Active Electronically Steered Array[/url]



I think the same can be applied for PAK-FA depending what gold plated version of PAK-FA one is building

[/quote]



The article talking of largely using AESA modules for direction finding (spatial location). I t does not claim using L band AESA for radar (detection and ranging).



Antenna gain is a function of physical planar area of antenna array. Thus when mounted on leading edge of the wing, one will get excellent antenna gain and beam steering in azimutal plane, but because the number of L band antenna elements that can be put into (say 1 foot thick) leading edge wing surface is limited to about 8 (at serious risk to inter element isolation) the gain is seriosuly limited, and the resulting beam is very thick in elevation. Overall the gain of the antenna is due to elements in horizontal wing. Radar's range is a function of peak EIRP that radar can generate and such antenna due to limited antenna gain will have poor range, as well as poor pointing accuracy in elevation, but reasonably good on azimuth. One can realize good 2-D radar performance from such radar, but not 3-D radar performance.



Putting the AESA element on tail fin similarly has problem in azimuthal plane. However by synthesizing antenna elements in leading edge of both fins one can get reasonably good gain in azimuth and elevation. However because the tail is separated a distance that is many times the L band wavelength, there will be lots of fringing in azimuth beam formation (beam splitting due to Fresnel effect). Hence reasonable 2-D radar but not so great 3D radar performace. Teh problem with tail is it has small field of view and blind to the bogies below the wing plane.



Now instead of leading edge if they us the flat tail surface to construct the AESA radar that will work great; note that it will be looking in space that is not served by main nose radome antenna. And yes that flat surface can still be made stealthy for the time duration the radar is not transmitting or receiving.. Similarly AESA can be mounted conformal on main wing surface looking above and below.



Now if the AESA antenna array is not just along the wing's leading edge but also extend out back into the wing surface (top and bottom) that will give good performance, and cover broad solid angle (minimizing blind spots)
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International Military News and Discussion - by Guest - 01-29-2010, 12:48 PM
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