Zobraziť v EDS

Refined high-resolution spaceborne SAR imaging processing with an improved extended omega-K algorithm.

Uložené v:
Podrobná bibliografia
Názov: Refined high-resolution spaceborne SAR imaging processing with an improved extended omega-K algorithm.
Autori: Li, Haisheng1,2 (AUTHOR) lihaisheng21@mails.ucas.ac.cn, Jiang, Xiujie2 (AUTHOR), Cao, Yaming3 (AUTHOR), Wang, Xing1 (AUTHOR)
Zdroj: International Journal of Remote Sensing. Nov2025, p1-24. 24p. 13 Illustrations.
Predmety: *HIGH resolution imaging, *SIGNAL processing, *INTERPOLATION, *SPACE-based radar
Abstrakt: The advancement of spaceborne synthetic aperture radar (SAR) into very high-resolution regimes introduces significant challenges in signal processing, particularly concerning precise echo modelling and focusing algorithm design. This article proposes an improved Extended Omega-K Algorithm (EOKA) to address these challenges. The proposed algorithm effectively compensates for the ‘fast-time’ and ‘slow-time’ effects induced by the stop-and-go approximation, incorporates a two-step orbit compensation (OCO) to mitigate errors from orbital curvature, and employs a deramp operation for azimuth preprocessing to resolve spectrum aliasing. A key enhancement is made to the Stolt interpolation to account for the spatial variability of the equivalent velocity in range. The proposed high-resolution imaging algorithm is evaluated through point target simulations, which demonstrate optimal focusing effects and highlight the effectiveness of the improved EOKA in addressing the challenges of high-resolution spaceborne SAR signal processing. [ABSTRACT FROM AUTHOR]
Databáza: Academic Search Index
Popis
Abstrakt:The advancement of spaceborne synthetic aperture radar (SAR) into very high-resolution regimes introduces significant challenges in signal processing, particularly concerning precise echo modelling and focusing algorithm design. This article proposes an improved Extended Omega-K Algorithm (EOKA) to address these challenges. The proposed algorithm effectively compensates for the ‘fast-time’ and ‘slow-time’ effects induced by the stop-and-go approximation, incorporates a two-step orbit compensation (OCO) to mitigate errors from orbital curvature, and employs a deramp operation for azimuth preprocessing to resolve spectrum aliasing. A key enhancement is made to the Stolt interpolation to account for the spatial variability of the equivalent velocity in range. The proposed high-resolution imaging algorithm is evaluated through point target simulations, which demonstrate optimal focusing effects and highlight the effectiveness of the improved EOKA in addressing the challenges of high-resolution spaceborne SAR signal processing. [ABSTRACT FROM AUTHOR]
ISSN:01431161
DOI:10.1080/01431161.2025.2591864