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Download PDF by H. E. G. Jeske (auth.): Atmospheric Effects on Radar Target Identification and

By H. E. G. Jeske (auth.)

ISBN-10: 9401015317

ISBN-13: 9789401015318

ISBN-10: 9401015333

ISBN-13: 9789401015332

The complicated research Institute (ASI) below dialogue used to be initiated by means of the "Special Programme Panel on Radio­ meteorology" of the clinical Affairs department of NATO. The area of this panel - and for that reason the subjects in their former ASI-~rogrammes - is the influ­ ence of the non-ionized surroundings on electromagnetic wave propagation, its prediction and its use as a re­ mote sensing procedure. it's the ultimate objective to notify radio and radar engineers concerning the a number of defects brought on by the propagation medium surroundings. this present day there exist high-sensitive radar structures which could professional­ vide id and bring photos of far away ob­ jects very thoroughly via measuring a) the influence of the objective at the form of a brief radar pulse, or b) the wave entrance (phase and amplitude distribution) and its orientation in house. yet usuallv the radar-to-target direction is thru the inhomogeneous and turbulent atmo­ sphere and so the absolut limits of the process are quite often made up our minds through this surroundings. It used to be the plan of this ASI to rearrange an interdisciplinary info trade among radar specialists and propagation specia­ lists as a way to get a greater knowing of the susceptibility to atmospheric results and to develope new equipment that might lessen or right those error. The lectures given and particularly the extensive dis­ cussions through the workshop periods contributed to this aim.

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Additional resources for Atmospheric Effects on Radar Target Identification and Imaging: Propagation Effects on the Non-Ionized Atmosphere on the Presentation and Analysis of Radar Targets, Especially in the mm- to m-Range of the Electromagnetic Spectrum

Example text

To date, no reliable anaparabolic cylinders lytical methods for estimating 33 SHORT-PULSE TARGET CHARACTERISTICS the scattering from ducts seems to be available, and measurements, at least on reasonably accurate scale models, seem to be nearly essential. Much further work remains to be done on scattering from ducts. Scattering from corner reflectors can be approximated quite well by assuming optical reflections from the flat surfaces and by examining carefully the chan~es in polarization produced by the multiple reflections.

378-385)J. For 9 not very large, equation 38 can be expected to hold for the orthogonal polarization as well. Interestingly, this result is in agreement with physical optics for 9 and a both small. For axial incidence backscattering, the ReS found from equation 38 becomes Res = A. 2/(16rr)a 4 (39) which i~ essentially the4 same as the physical-optics result, which has tan a in place of a , provided a is small. Backscattering from a sharp tip, especially when short wavelengths are used, is a very small contribution to body ReS or transient response.

In an FM/CW radar, we spectrum analyze this signal, the amplitude of the spectrum at a given frequency corresponding to the scattering amplitude at a given range. 5T) with very little error. The spectrum of eo(t) is thus N ~ (f) = (T/4) f; N E (A +B ) sinc[fT-BW1"+o. 5n/B)2]} (53) The quadratic term in the exponential is negligible in most practical systems, just as it was in the chirp-radar case. We assume the folded-spectrum terms are negligible in the spectrum of the SHORT-PULSE TARGET CHARACTERISTICS 45 mixed signal.

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Atmospheric Effects on Radar Target Identification and Imaging: Propagation Effects on the Non-Ionized Atmosphere on the Presentation and Analysis of Radar Targets, Especially in the mm- to m-Range of the Electromagnetic Spectrum by H. E. G. Jeske (auth.)


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