New slant range model and azimuth perturbation resampling based high-squint maneuvering platform SAR imaging

• 作者: XIONG Xuying LI Gen MA Yanheng CHU Lina
• 来源期刊: 系统工程与电子技术（英文版）
• 年，卷（期）: 2021,（3）
• 所属期刊栏目: ELECTRONICS TECHNOLOGY
• 页码范围: 545-558
• 页数: 14页
• 语种: 英文
• DOI: 10.23919/JSEE.2021.000046

摘要

Strong spatial variance of the imaging parameters and serious geometric distortion of the image are induced by the acceleration and vertical velocity in a high-squint synthetic aper-ture radar(SAR)mounted on maneuvering platforms.In this pa-per,a frequency-domain imaging algorithm is proposed based on a novel slant range model and azimuth perturbation re-sampling.First,a novel slant range model is presented for miti-gating the geometric distortion according to the equal squint angle curve on the ground surface.Second,the correction of azimuth-dependent range cell migration(RCM)is achieved by in-troducing a high-order time-domain perturbation function.Third,an azimuth perturbation resampling method is proposed for azi-muth compression.The azimuth resampling and the time-do-main perturbation are used for correcting first-order and high-or-der azimuthal spatial-variant components,respectively.Experi-mental results illustrate that the proposed algorithm can im-prove the focusing quality and the geometric distortion correc-tion accuracy of the imaging scene effectively.