Journal of University of Chinese Academy of Sciences >
A SAR motion compensation algorithm based on Chirplet transform
Received date: 2024-02-20
Revised date: 2024-04-25
Online published: 2024-05-29
As the resolution of airborne synthetic aperture radar continues to improve, motion compensation has become a core link to ensure high-quality imaging. This paper conducts an in-depth analysis of the motion error of chirped pulse SAR, and proposes a Chirplet transform motion compensation algorithm based on original echo data to address the problem of non-space-variant phase error compensation of SAR. This algorithm uses Chirplet transform for time-frequency analysis to accurately characterize the phase error in the echo data, uses maximum likelihood estimation to extract the modulation frequency of the phase error, and solves the phase error for motion compensation. Compared with the PGA algorithm, this algorithm does not need to rely on strong scattering points and can achieve better image focusing performance in the presence of large phase errors. Compared with the MD subaperture algorithm, this algorithm performs frequency modulation rate estimation for each point, resulting in a more precise estimation. Finally, simulation experiments and quantitative analysis verified the effectiveness of the algorithm.
Qianli MA , Qunying ZHANG , Guohua ZHANG , Wei LU , Xiaojun LIU . A SAR motion compensation algorithm based on Chirplet transform[J]. Journal of University of Chinese Academy of Sciences, 2026 , 43(1) : 70 -79 . DOI: 10.7523/j.ucas.2024.035
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