A 2-D Space-Variant Chirp Scaling Algorithm Based on the RCM Equalization and Subband Synthesis to Process Geosynchronous SAR Data

• Published in: IEEE transactions on geoscience and remote sensing Vol. 52; no. 8; pp. 4868 - 4880
• Main Authors: Sun, Guang-Cai, Xing, Mengdao, Wang, Yong, Yang, Jun, Bao, Zheng
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.08.2014; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: 2-D space variant; Algorithms; Applied geophysics; Azimuth; Azimuth subband division and synthesis; Chirp; Computer simulation; Earth sciences; Earth, ocean, space; Educational institutions; Equalization; Exact sciences and technology; geosynchronous synthetic aperture radar (GEO-SAR); Internal geophysics; Migration; Orbits; Polynomials; range cell migration (RCM) equalization; RCM; Signal processing algorithms; Software algorithms; Synthesis; Synthetic aperture radar; range cell migration (RCM) equalization; Azimuth subband division and synthesis; 2-D space variant; geosynchronous synthetic aperture radar (GEO-SAR); synthesis; algorithms; models; corrections; migration; remote sensing; errors; Synthetic aperture radar
• ISSN: 0196-2892; 1558-0644
• DOI: 10.1109/TGRS.2013.2285721

A space-variant chirp scaling algorithm based on the range cell migration (RCM) equalization and azimuth subband synthesis has been studied to process simulated geosynchronous synthetic aperture radar (GEO-SAR) data. The acceptable order of terms in polynomials for the slant range models in the RCM correction and phase error compensation, division of subband, and suppression of grating lobes of the subbands was investigated. Qualitatively and quantitatively, the method was able to focus simulated GEO-SAR signals well. Finally, the constraint on the spatial extent of azimuth and range dimensions using the algorithm was assessed.