Focusing of Highly Squinted Bistatic SAR With MEO Transmitter and High Maneuvering Platform Receiver in Curved Trajectory

Zhang, Yun; Ren, Hang; Lu, Zheng; Yang, Xueying; Li, Gaopeng

doi:10.1109/tgrs.2024.3493614

IEEE Trans. Geosci. Remote Sensing

2024

DOI: 10.1109/tgrs.2024.3493614

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Focusing of Highly Squinted Bistatic SAR With MEO Transmitter and High Maneuvering Platform Receiver in Curved Trajectory

Yun Zhang,

Hang Ren,

Zheng Lu

et al.

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Cited by 1 publication

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A High-Resolution Spotlight Imaging Algorithm via Modified Second-Order Space-Variant Wavefront Curvature Correction for MEO/HM-BiSAR

Ren,

Lu,

et al. 2024

Remote Sensing

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A bistatic synthetic aperture radar (BiSAR) system with a Medium-Earth-Orbit (MEO) SAR transmitter and high-maneuvering receiver (MEO/HM-BiSAR) can achieve a wide swath and high resolution. However, due to the complex orbit characteristics and the nonlinear trajectory of the receiver, MEO/HM-BiSAR high-resolution imaging faces two major challenges. First, the complex geometric configuration of the BiSAR platforms is difficult to model accurately, and the ‘non-stop-go’ effects should also be considered. Second, non-negligible wavefront curvature caused by the nonlinear trajectories introduces residual phase errors. The existing spaceborne BiSAR imaging algorithms often suffer from image defocusing if applied to MEO/HM-BiSAR. To address these problems, a novel high-resolution imaging algorithm named MSSWCC (Modified Second-Order Space-Variant Wavefront Curvature Correction) is proposed. First, a high-precision range model is established based on an analysis of MEO SAR’s orbital characteristics and the receiver’s curved trajectory. Based on the echo model, the wavefront curvature error is then addressed by two-dimensional Taylor expansion to obtain the analytical expressions for the high-order phase errors. By analyzing the phase errors in the wavenumber domain, the compensation functions can be designed. The MSSWCC algorithm not only corrects the geometric distortion through reverse projection, but it also compensates for the second-order residual spatial-variant phase errors by the analytical expressions for the two-dimensional phase errors. It can achieve high-resolution imaging ability in large imaging scenes with low computational load. Simulations and real experiments validate the high-resolution imaging capabilities of the proposed MSSWCC algorithm in MEO/HM-BiSAR.

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A High-Resolution Spotlight Imaging Algorithm via Modified Second-Order Space-Variant Wavefront Curvature Correction for MEO/HM-BiSAR

Ren,

Lu,

et al. 2024

Remote Sensing

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Focusing of Highly Squinted Bistatic SAR With MEO Transmitter and High Maneuvering Platform Receiver in Curved Trajectory

Cited by 1 publication

References 43 publications

A High-Resolution Spotlight Imaging Algorithm via Modified Second-Order Space-Variant Wavefront Curvature Correction for MEO/HM-BiSAR

A High-Resolution Spotlight Imaging Algorithm via Modified Second-Order Space-Variant Wavefront Curvature Correction for MEO/HM-BiSAR

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