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Research on Airborne SAR Imaging Algorithm Based on Measured Data

Author: Zhang
Tutor: JiangYiCheng
School: Harbin Institute of Technology
Course: Information and Communication Engineering
Keywords: Airborne synthetic aperture radar (SAR) Imaging algorithm Image quality evaluation index Super-resolution algorithm
CLC: TN958.2
Type: Master's thesis
Year: 2007
Downloads: 185
Quote: 1
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Abstract


Synthetic aperture radar (SAR) imaging to obtain high-resolution images, it improves the radar's ability to obtain information and information perception, Airborne SAR has become a more common means to obtain ground images. Research and implementation of imaging algorithms, this paper based on laboratory two sets of airborne SAR measured data contrast imaging results of various algorithms based on the summary of the applicable conditions and the advantages and disadvantages of practical significance. The paper is divided into six chapters, the first review of some of the basic problems of airborne synthetic aperture radar, introduces the basic principles of synthetic aperture radar, range and azimuth resolution, distance migration, depth of focus, the theoretical basis of the stationary phase principle . Analysis of the imaging mechanism and then start from the traditional RD algorithm for point target simulation, the measured data imaging; standard CS algorithm followed by in-depth research, the nonlinear CS algorithm, RMA algorithm, multi-view algorithm, and the more cutting-edge super-resolution algorithm, the completion of the measured data imaging. From migration from the imaging process, in the case of being the side of a small, various imaging algorithms are possible to obtain the high quality of the target two-dimensional image; in the case of small oblique angle, including the secondary range compression, The RD algorithm still has better performance, but requires interpolation, increases the amount of computation; in the case of large squint angle, RD algorithm may not be able to imaging, ideal wavenumber domain algorithm has theoretically the best performance, but the frequency domain interpolation accuracy requirements, makes a very huge amount of computation, image quality should be the best nonlinear CS algorithm similar RMA imaging results and standard CS algorithm imaging results. Although the two sets of data are all positive side-view scene imaging, but during the flight, the carrier aircraft inevitably subject to various disturbances, motion error caused by the imaging quality. Orientation to better focus in the study of various phase error on the point of impact of the target impulse response, respectively, the estimated Doppler center frequency and modulation frequency spectral energy balance method and the sub-aperture to the measured data value and calculate the oblique angle of the speed of the carrier aircraft and radar antenna phase center, according to the Doppler parameters to compensate for movement phase error. Finally, image quality assessment indicators, analysis of various algorithms from multiple imaging quality, and concluded that based on the assessment indicators. The two sets of measured data imaging algorithm research, accumulated experience in large-scale imaging applications.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Radar > Radar: institutional sub- > Pulsed Doppler system radar
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