By P. Lacomme, J. C. Marchais, J. P. Hardange, E. Normant
This new identify offers a finished account of the present nation of the most forms of airborne and spaceborne radar structures. each one procedure is roofed by way of the elemental radar rules, capabilities and houses, in addition to the radar's position in the total process and undertaking. Given altering operational standards, the authors additionally think about how radar may well evolve into the longer term. The booklet merits from the information of the writer crew, who're operating in a firm thought of to be a centre of excellence for advertisement radar development.
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Additional info for Air and Spaceborne Radar Systems (Radar, Sonar, Navigation and Avionics Series)
Sample text
Swerling Model IV Target fluctuation is the same as in Model III but with decorrelation from pulse to pulse. 6 shows real aircraft RCS measurements in S band. 5 Mathematical Modeling of the Received Signal The power of the received signal is not sufficient to define the optimal processing required for its detection, and we must determine the mathematical expression of this signal. The transmitted signal ue(t) is composed of a modulation u(t) (which can be complex) modulating a carrier wave with a frequency f0.
For real targets Y U ⁄ F © , s(t) is expressed as follows: Y U V( W) • W 5 ± Y U W Mπ ------Mϕ λ H $X W ± ------------------ H F In a normal situation of narrow bandwidth operation (a few percents) and over short processing periods (a few milliseconds), the equation 5 ± YU W ------------------ , F W representing the delay due to the distance traveled to and from the target, is presumed constant. 6) where fD is the Doppler frequency of the target. s(t) is a complex signal whose components I(t) and Q(t)— such that s(t) = I(t) + jQ(t)—are obtained from the real signal sr(t) via synchronous demodulation using a quadrature mixer (I/Q mixer).
10) or at altitude. 11). The formation of this duct can result from surface evaporation over the sea (evaporation duct). Radar range is therefore high for targets within the duct. However, targets located at higher altitudes go undetected. 11 Abnormal Propagation /DFRPPH5DGDUERRN 3DJH 0RQGD\ )HEUXDU\ 30 Chapter 4 — Propagation 45 Whenever the duct is situated at altitude, the wave is trapped between two low index layers surrounding a higher index area (a phenomenon similar to propagation in optical fibers).
