In this article, we will compute the bi-static radar cross-section (RCS) of a Dassault Mirage III type fighter aircraft at 850 MHz with [[EM.Tempo]]. Throughout the article, we will discuss a few challenges involved in working with electrically-large models.
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{{Note| For an in-depth tutorial related to computing RCS in [[EM.Tempo]], please review [[EM.Tempo Tutorial Lesson 2: Analyzing Scattering From A Sphere]]}}
== Computational Environment ==
The CAD model used for this simulation was found on [https://grabcad.com/ GrabCAD], an online repository of user-contributed CAD files and models. [[EM.Cube]]'s IGES import was then used to import the model. Once we import the model, we move the Mirage to a new PEC material group in [[EM.Tempo]].
<div><ul> <li style="display: inline-block;"> [[Image:glass.png ââ|thumb|left|200px|Selecting glass as cockpit material for the Mirage model.]]</li><li style="display: inline-block;"> [[Image:Mirage image.png ââ|thumb|left|200px|Complete model of Mirage aircraft.]]</li></ul></div>
For the present simulation, we model the entirety of the aircraft, except for the cockpit, as PEC. For the cockpit, we use [[EM.Cube]]'s material database to select a glass of our choosing.
Since we're computing a Radar Cross Section, we also need to add a planewave source. For this example, we will specify a TMz planewave with θ = 135 degrees, φ = 0 degrees, or:
:<math> \hat{k} = \frac{\sqrt{2}/}{2 } \hat{x} - \frac{\sqrt{2}/}{2 } \hat{z} </math>
===Mesh Settings===
[[Image:Large struct article ScreenCapture3.png|thumb|left|300px|RCS pattern of the Mirage model at 850 MHz in dBsm.]]
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</ul></div>Â <div><ul> <li style="display: inline-block;"> [[Image:RCS XY.pngâ|thumb|left|300px|XY cut of RCS]]</li><li style="display: inline-block;"> [[Image:RCS ZX.pngâ|thumb|left|300px|ZX cut of RCS]]</li><li style="display: inline-block;"> [[Image:Large struct article RCS YZ.pngâ|thumb|left|300px|YZ cut of RCS in m^2.]]</li>
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<div><ul>
<li style="display: inline-block;"> [[Image:Large struct article ScreenCapture2ScreenCapture1.png|thumb|left|300px]] </li><li style="display: inline-block;"> [[Image:Large struct article ScreenCapture1ScreenCapture2.png|thumb|left|300px]]</li></ul></div>Â <div><ul> <li style="display: inline-block;"> [[Image:RCS XY Polar.png||thumb|left|300px| XY Cut of RCS is dBsm]]</li><li style="display: inline-block;"> [[Image:RCS ZX Polar.png||thumb|left|300px| ZX Cut of RCS is dBsm]] </li><li style="display: inline-block;"> [[Image:RCS YZ Polar.png||thumb|left|300px| YZ Cut of RCS is dBsm]] </li>
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