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5. Method of calculation of detection zones of surveillsnce radars, which are employed on real positions

#### Method of calculation of detection zones of surveillsnce radars, which are employed on real positions

V. Klimchenko, M. Petrushenko, O. Maliarenko, I. Trofymov, V. Kuts
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Description: The known methods of radar detection zones calculation on the basis of mathematical model (to the approximating func-tion) of radar elevation direction pattern are analyzed. The known methods of detection zones evaluation determine only poten-tial possibilities of radar and are of the little use for practice from impossibility of account of plenty of casual factors which in one or another measure influence on the results of calculations. More acceptable variant is combination of analytically calcula-tion methods of determination of detection zones with those experimental verifications which were conducted in the process of radar tests. A combined methodology for determining target detection zones is considered, which combines the advantages of currently known and widely used methods. The essence of the proposed method consists in combining analytical calculations with the results of radar check flights during the test period. The interference of the direct and reflected radio waves from the underlying surface is taken into account only for those positions or individual sectors in which the size of the segment that is important for radio wave reflections non exceeds the range to the nearest obstacles that create shading (closing angles). Partial methods of calculation zones during flight of air targets at constant and low altitudes with curvature of terrain are given. The basic part of method in calculating zones during flight of air targets at constant altitude is the solution of a system of two equa-tions, one of which describes the vertical section of the detection zone and the other one – the flight of the target at a constant altitude with refraction. The terrain data in each azimuth direction is used for calculating detecting areas of air targets in flying at low altitudes with curvature of terrain. The azimuth discreteness should be no more than half the width of the bottom in the azimuth plane.

Keywords: surveillance radar, target detection zone, direction pattern, terrain relief.

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