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  5. Measuring angle of the targets in the survey meter range radars of the radio-technical troops

Measuring angle of the targets in the survey meter range radars of the radio-technical troops

V. Zyukin, S. Kukobko, I. Trofymov, D. Kozlov 
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Description: The variants of realization in the meter range radar of radio technical troops of wavelengths channels in angular bearing direction of the targets are considered. For describing the expected amplitude-phase distribution of the echo signal at the vertical opening of the antenna, using a number of modern methods of monitoring the radar detection zones at the position is proposed. In the case of a small number of layers of the radar antenna array, under conditions of significant reflection of radio waves by the earth's surface, ambiguity of angular measurements occurs (false angular bearings are formed). For eliminating false information, a number of methods are proposed that are based on additional space-time modulation of sounding signals. Temporal modulation can be accomplished by changing the carrier frequency of the emitted signals and space modulation by operatively changing the shape of the antenna pattern in the irradiation target. Methods and results of calculations of quality indicators of measurements at use of the offered variants of construction of channels in angular direction bearing targets are given. Optimization of space (angular) processing allows to provide (with respect to the P-18 radar and its modifications) an energy gain of up to 3 dB. The root-mean-square errors of angular bearing (at angles above 5–6 degrees) can be reduced to fractions of a degree. The probability of false angular bearings (in the range of 0-30 degree angles) can be no more than 0.01 - 0.05. It is possible to resolve targets at the corner of the site, to begin with, under two hypotheses: a) one target; b) more than one target. The presented method can serve as a basis for the analysis of potential possibilities for measuring the angular coordinates of the targets in the existing and perspective survey radars of radio-technical troops in the presence of significant rereflection of radio waves by the earth surface and can also be used for the rational choice of rational technical solutions.


Keywords: radar of the meter wavelength range, measurement of elevation coordinates of targets, false elevation bearings, space-time modulation of the probing signals, angular resolution of the radar

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Reference:
 Ziukin, V.F., Kukobko, S.V., Trofymov, I.M. and Kozlov, D.M. (2019), “Vymiriuvannia kuta mistsia tsilei v ohliadovykh RLS RTV metrovoho diapazonu khvyl” [Measuring angle of the targets in the survey meter range radars of the radio-technical troops], Scientific Works of Kharkiv National Air Force University, Vol. 4(62), pp. 98-104. https://doi.org/10.30748/zhups.2019.62.14.

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