The Space-Variant Phase-Error Matching Map-Drift Algorithm for Highly Squinted SAR

• Published in: IEEE geoscience and remote sensing letters Vol. 10; no. 4; pp. 845 - 849
• Main Authors: Tang, Yu, Zhang, Bo, Xing, Mengdao, Bao, Zheng, Guo, Liang
• Format: Journal Article
• Language: English
• Published: Piscataway IEEE 01.07.2013; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Algorithms; Azimuth; Chirp; Compensation; Doppler; Doppler effect; Estimation; Highly squinted synthetic aperture radar (SAR); map drift (MD); Matching; Phases; Signal processing algorithms; space-variant phases; Synthetic aperture radar; Time domain; Time domain analysis
• ISSN: 1545-598X; 1558-0571
• DOI: 10.1109/LGRS.2012.2226139

In highly squinted synthetic aperture radar (SAR) motion compensation, the map-drift (MD) algorithm cannot estimate the Doppler chirp rate accurately when the range walk is compensated in the azimuthal time domain. This problem stems from the influence of the azimuthal position-dependent (i.e., space-variant) phases, which are introduced by the compensation of the range walk in the azimuthal time domain on the Doppler chirp rate estimation. This letter proposes a space-variant phase-error matching MD algorithm that can improve the precision of estimating the Doppler chirp rate for the highly squinted SAR by removing the influence of the azimuthal position-dependent phases.