A method for calculating errors in measuring the angular coordinates of a radar target presented as a multipoint model

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Abstract

The problem of determining errors in measuring angular coordinates (angular noise) of a radar target presented as a multipoint model is considered. A method for calculating errors in the angular coordinates of targets is proposed, which is based on determining the gradient of the phase field of the wave at the point of reception of reflected signals. Analytical relations have been obtained that make it possible to calculate the direction of arrival of waves with an arbitrary number and location of points in a multipoint target model. For various types of targets — low-flying, group and single targets with a different number of points, calculations of errors in the angles of arrival of radio waves were carried out. In this case, angular errors are understood as the deviation of the direction of arrival of reflected radio waves from the direction of the geometric center of the target. The analysis of the causes of abnormal errors in measuring angles for the considered cases of numerical calculations is carried out.

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About the authors

K. Yu. Gavrilov

Moscow Aviation Institute (National Research University)

Author for correspondence.
Email: gvrk61@mail.ru
Russian Federation, Moscow

S. L. Zlobin

Public Joint Stock Company Scientific and Production Association “Almaz” named after Academician A.A. Raspletin

Email: gvrk61@mail.ru
Russian Federation, Moscow

Ya. I. Malashko

Public Joint Stock Company Scientific and Production Association “Almaz” named after Academician A.A. Raspletin

Email: gvrk61@mail.ru
Russian Federation, Moscow

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Supplementary files

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2. Rice. 1. Multi-point target model.

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3. Fig. 2. Location of a two-point target in the plane.

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4. Fig. 3. Scheme for receiving signals from a target and its mirror image (antipode).

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5. Fig. 4. Target elevation error depending on projection range: (a) — for ranges of 1…2 km; (b) — for ranges of 2…100 km.

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6. Fig. 5. Dependence of the elevation angle error on the target projection range: solid line – at cm; dashed-dotted line – at cm.

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7. Fig. 6. Schematic arrangement of points of a group high-altitude two-point target.

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8. Fig. 7. Dependence of the target elevation angle error on the projection range with the ratio of signal amplitudes and the spacing of points by height m (m).

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9. Fig. 8. Dependence of angular error on projection range for a group three-point target (wavelength m).

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10. Fig. 9. Location of points of a four-point target model in the plane.

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11. Fig. 10. Dependences of the elevation error on the target rotation angle θпов: (a) — with equal amplitudes of signals of all points; (b) — with relative values ​​of amplitudes equal to 1; 0.9; 0.8; 0.7.

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