ISAR images focusing on outdoor measurements facility

S. I. Moryakov, S. M. Nesterov, I. A. Skorodumov

Central Research Institute of troops aerospace defense
Ministry of Defense of the Russian Federation

The paper is received on May 13, after correction - on May 30, 2016

Abstract. Modern wideband radar systems and tools with digital signal processing and inverse synthetic aperture radar imaging capabilities provide a new quality of radar information to solve identification and flaw detection problem. Development and improvement of these systems are inseparably linked with theoretical and experimental research in this area. The experimental inverse synthetic aperture radar imaging of full-scale objects and scale model of the object on outdoor measurements facilities with mount and rotating system, which provides the necessary range and load-carrying capacity, is of great practical importance. The dynamics load during measurements on outdoor facility with flexible mount system leads to the displacement of the object and respectively to phase errors in receiving signal. As a result, wide-angle inverse synthetic aperture radar images are defocused, distorted and blurred. In the paper algorithms of object axis of rotation distance offset estimation in outdoor measurements facility with flexible mount system are proposed. Algorithms are based on marker coordinate data processing and provide phase shifts compensation needed to focus wide-angle inverse synthetic aperture radar images. We propose solutions of various locations of markers on the object to create well-focused inverse synthetic aperture radar images. The assessment of quality of focused inverse synthetic aperture radar images is conducted by cross-correlation with eigenfunction analytical solution of calibration object. In the paper it is shown that results provide well focused wide-angle inverse synthetic aperture radar imaging on outdoor measurements facility with flexible mount system. Focused inverse synthetic aperture radar images are nessesary for development and improvement of modern wideband radar systems with digital signal capabilities.

Key words: inverse synthetic aperture, radar images, radar cross section, correlation processing.

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