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- Title
A Modified Keystone-Based Forward-Looking Arc Array Synthetic Aperture Radar 3D Imaging Method.
- Authors
Zhu, Xiaofan; Huang, Pingping; Xu, Wei; Tan, Weixian; Qi, Yaolong
- 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.
- Subjects
SYNTHETIC aperture radar; SYNTHETIC apertures; THREE-dimensional imaging; IMAGING systems; SPATIAL resolution; SPATIAL systems; AZIMUTH
- Publication
Sensors (14248220), 2023, Vol 23, Issue 5, p2674
- ISSN
1424-8220
- Publication type
Article
- DOI
10.3390/s23052674