A Modified Keystone-Based Forward-Looking Arc Array Synthetic Aperture Radar 3D Imaging Method
Author:
Zhu Xiaofan12, Huang Pingping12ORCID, Xu Wei12ORCID, Tan Weixian12ORCID, Qi Yaolong12
Affiliation:
1. College of Information Engineering, Inner Mongolia University of Technology, Hohhot 010051, China 2. Inner Mongolia Key Laboratory of Radar Technology and Application, Hohhot 010051, China
Abstract
An arc array synthetic aperture radar (AA-SAR) is a new type of omnidirectional observation and imaging system. Based on linear array 3D imaging, this paper introduces a keystone algorithm combined with the arc array SAR 2D imaging method and proposes a modified 3D imaging algorithm based on keystone transformation. The first step is to discuss the target azimuth angle, retain the far-field approximation method of the first-order term, analyze the influence of the forward motion of the platform on the along-track position, and realize the two-dimensional focusing of the target slant range–azimuth direction. The second step is to redefine a new azimuth angle variable in the slant-range along-track imaging and use the keystone-based processing algorithm in the range frequency domain to eliminate the coupling term generated by the array angle and the slant-range time. The corrected data are used to perform along-track pulse compression to obtain the focused image of the target and realize the three-dimensional imaging of the target. Finally, in this article, the spatial resolution of the AA-SAR system in the forward-looking state is analyzed in detail, and the change in the spatial resolution of the system and the effectiveness of the algorithm are verified through simulation.
Funder
National Natural Science Foundation of China Natural Science Foundation of Inner Mongolia Autonomous Region Major Project of Science and Technology of Inner Mongolia Autonomous Region
Subject
Electrical and Electronic Engineering,Biochemistry,Instrumentation,Atomic and Molecular Physics, and Optics,Analytical Chemistry
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