By Jenn, David C.
Prediction, aid, and dimension of electromagnetic scattering from complicated 3-dimensional objectives continues to be the first emphasis of this article. The second variation contains a extra broad creation that covers the $64000 features of stealth expertise and the original tradeoffs serious about stealth layout. New subject matters on computational tools just like the finite point process and the finite integration strategy are lined, in addition to new components within the program of radar soaking up fabric and synthetic metamaterials.
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Extra resources for Radar and Laser Cross Section Engineering
A dual-polarized antenna) or two separate antennas must be used. 52) The Spq are the scattering parameters, and p and q can be either 0 or q~ (p, q - - 0 , q~). The first index specifies the polarization of the receive antenna and the second the polarization of the incident wave. For example, Soo relates Eso to Eio and thus represents the response of a 0-polarized receive antenna when the target is illuminated by a pure 0-polarized incident wave. The elements of the scattering matrix are complex quantities that can be determined by analysis or measurement.
Can be illuminated by the main beam of the antenna or one of its sidelobes, as shown in Fig. 13. Even though the clutter is in a sidelobe, and therefore the antenna gain is much lower than the main-beam gain, the clutter area can be extremely large, and hence its echo much larger than that of a low observable target in the main beam. Again, it is possible to discriminate the target from the clutter based on Doppler frequency. As shown in Fig. , reflections from the ground and other reflecting surfaces) presents a problem.
The target moves in a circle around the radar (in azimuth, at a constant elevation). The radar main beam is fixed on the target, and for each azimuth angle Rmaxis computed. After the calculation is completed for all azimuth angles, the contour of all Rmax values is displayed on a polar grid. Using the efficiency and computed antenna dimensions, RADJAM plots the pattern shown in Fig. 18. 2, and plotted by RADJAM in Fig. 19. Now adding a 10 W jammer 10 km from the radar at 0 ° azimuth, the plot in Fig.
Radar and Laser Cross Section Engineering by Jenn, David C.