Download Millimeter-Wave Radar Targets and Clutter (Artech House by Gennadiy Kulemin, David K Barton PDF

By Gennadiy Kulemin, David K Barton

ISBN-10: 1580535402

ISBN-13: 9781580535403

ISBN-10: 1580537340

ISBN-13: 9781580537346

Supported with over 280 equations and greater than a hundred thirty illustrations, this reference offers a precis of the interactions among radar waves and the whole category of objectives and litter affecting operation of radar within the top microwave and millimeter-wave bands.

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Sample text

From: [51]. ) where n 1 and n o are the refractivity coefficients for the peak and atmosphere, respectively. 30) and n−1 | ⌫ | 2 = 2␥ p 2 и ⌬p2 where (n − 1) = 320 и 10−6 for a standard atmosphere at height about 500m above sea level. 30) for an infinitely thin jump. 3 Radar Reflections from Explosions and Gas Wakes of Operating Engines 45 where ⌬ is the effective front width and x denotes the direction normal to the front. 32) ␭2 Two obstacles cause SWF expansion in the turbulent atmosphere. The first is that the presence of turbulent temperature pulsations results in sound speed fluctuations.

Finally, the third cause of microwave attenuation in explosions is absorption by solid explosion products. 12, a large amount of carbon is given off during the detonation process. , usually they are much less than the wavelength). For derivation of absorption in such particles, the theory of Mie [48] can be used. 16) where ⑀ ′ and ⑀ ″ are the real and imaginary components of the dielectric constant, respectively. 18) that the attenuation factor grows inverse proportionally to the wavelength ␭ .

For instance, the sound radiation power of ‘‘Phantom’’ airplane is about 10 millimeter waves. The sound wave propagation is followed by a dielectric constant variation of the medium and, as result, by electromagnetic wave scattering from these dielectric constant perturbations. Let us evaluate the scattered field intensity for this case. 34) where ⑀ o = const denotes the dielectric constant of undisturbed medium, ⑀ 1 ( r›, t ) is the sound perturbation of the dielectric constant, usually ⑀ 1 ( r›, t ) << 1.

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