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  5. Influence of the angle of observation of air objects on the quality of their radar recognition

Influence of the angle of observation of air objects on the quality of their radar recognition

S. Leshchenko
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Description: The results of the study of the influence of the angle of observation of air objects on the quality of their radar recognition are given. As a sign of recognition is considered a range profile, which is obtained when using probing signals with high resolu-tion in range (high resolution radar HRR). Studies performed by the method of mathematical modeling. Recognition studies were carried out for 18 types of air objects as applied to a radar using signals with a spectrum width of 200 MHz (range resolution of 0.75 m) at a wavelength of 10 cm. The obtained numerical values of indicators of quality recognition of the type of air object. The recognition quality was estimated by the values of the recognition probability and the amount of recognition information. The preferred size of view sectors for the presentation of reference data has been determined. For sector sizes of 60°, 30° and 10°, the best recognition quality is observed for angle sectors of size 10°. It is shown that the best quality of recognition is pro-vided by observing a target at an angle of about 30 degrees with respect to the line of the axis of symmetry of an air object. The worst values of the recognition quality indicators are observed when accompanying air objects under the side angles. However, in this case, the system remains operable, since the probability of recognition is an order of magnitude higher than the probabil-ity of guessing. The impact of errors in measuring the rate of an air object on the quality of recognition is estimated. It is shown that course measurement errors, distributed according to the Gauss law with a standard deviation of 2° and zero mean, lead to a 13% decrease in the probability of recognition, and the amount of recognition information decreases by 10%.


Keywords: Radar recognition of air objects, recognition quality, range profile, mathematical modeling

Reference:
 Leshchenko, S.P. (2018), “Vplyv rakursu sposterezhennia povitrianykh obiektiv na yakist yikh radiolokatsiinoho rozpiznavannia” [Influence of the angle of observation of air objects on the quality of their radar recognition], Science and Technology of the Air Force of Ukraine, No. 4(33), pp. 60-68. https://doi.org/10.30748/nitps.2018.33.08.