Air and spaceborne radar systems: an introduction by P. Lacomme, J.C. Marchais, J.P. Hardange, E. Normant

By P. Lacomme, J.C. Marchais, J.P. Hardange, E. Normant

This new name offers a accomplished account of the present country of the most forms of airborne and spaceborne radar structures. every one approach is roofed by way of the fundamental radar ideas, capabilities and homes, in addition to the radar's position in the total method and challenge. Given altering operational requisites, the authors additionally ponder how radar may possibly evolve into the longer term. The booklet merits from the data of the writer workforce, who're operating in a firm thought of to be a centre of excellence for advertisement radar improvement.

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9). The Ascope presentation shown here is said to be “raw,” as it has not been submitted to any particular selection or processing. Whenever the display uses luminosity, the operator “processes” the signal, sometimes assisted by a threshold, by afterglow, or by the CRT memory; it “recognizes” echoes superimposed on the noise. 2 Choice of a Wavelength, fOL Radars operate over an extremely wide range of frequencies, from 40 MHz to 100 GHz. This range of frequencies thus covers the HF-, VHF-, UHF-, L-, S-, C-, X-, Ku-, K-, Ka-, V-, and W-bands.

1). Seen from the receiver R, the reflected wave appears to come from a fictitious point known as the image, symmetrical to the actual source S in relation to the plane P. The ratio between the reflected field ( U and the incident field ( L gives the reflection coefficient ρ of the plane. 1 Ground Reflection The fact that radar waves share the same reflection properties explains the double sphere phenomenon (see Chapter 3) between the target, T, and its image, I. This phenomenon is all the more noticeable when target, T or receiver R are close to ground level.

The height of sea waves). The greater the ratio, the greater the reflection. The Polarization of Wave and Incidence Angle Reflection phenomena are greater for waves whose incidence forms a low grazing angle (a phenomenon that can easily be observed optically over a stretch of water). Reflection phenomena also depend on polarization. 5 shows one example of variations in ρ with these parameters. Note that, for these measurements, the coefficient ρ is close to –1 (magnitude 1, phase 180°) at low grazing angles, whatever the polarization.

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