A Novel ISAR Imaging Algorithm for a Maneuvering Target Based on Generalized Second-Order Time-Scaled Transform
Date
2025-02-11
Journal Title
Journal ISSN
Volume Title
Publisher
IEEE Transactions on Geoscience and Remote Sensing
Abstract
It is well-known that for a maneuvering target, its ISAR imaging quality may significantly deteriorate by using the classical range-Doppler (RD) algorithm. To address this issue, this paper proposes a novel ISAR imaging algorithm based on the generalized second-order time-scaled transform (GSOTST). In the proposed method, the multicomponent cubic phase signal (CPS) modeling is adopted for the radar echo signal after translational motion compensation (TMC) in order to portray the phase change characteristics more accurately. First, the target signal is transformed into the slow-time-delay-time domain using a correlation kernel function (CKF). Subsequently, the non-stationary phase is eliminated in the slow-time-generalized delay-time frequency domain, and the GSOTST is utilized to decouple the temporal variables. Finally, the generalized Fourier transform is performed to transform the signal into the 2-D frequency domain, where the energy of the target signal is integrated into a well-focused 2-D peak, enabling the high-precision target parameter estimation as well as finely focused ISAR imaging. The experimental results from both simulation and real-measured data validate the effectiveness of the proposed algorithm.
Description
This article was originally published in IEEE Transactions on Geoscience and Remote Sensing. The version of record is available at: https://doi.org/10.1109/TGRS.2025.3540457.
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Keywords
inverse synthetic aperture radar (ISAR), Doppler parameter estimation, time-scaled transform, generalized Fourier transform
Citation
J. Ma, J. Wang, X. -G. Xia, H. T. P. Huang and G. Liao, "A Novel ISAR Imaging Algorithm for a Maneuvering Target Based on Generalized Second-Order Time-Scaled Transform," in IEEE Transactions on Geoscience and Remote Sensing, doi: 10.1109/TGRS.2025.3540457.