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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2013-01-08
An Efficient Imaging Approach for Tops SAR Data Focusing Based on Scaled Fourier Transform
By
Pingping Huang,

    Dr. Pingping Huang

    Inner Mongolia University of Technology

    China

    Homepage

Wei Xu

    Dr. Wei Xu

    Department of Spaceborne Microwave Remote Sensing

    Institute of Electronics, Chinese Academy of Sciences

    China

    Homepage

Progress In Electromagnetics Research B, Vol. 47, 297-313, 2013
doi:10.2528/PIERB12081804 | Google Scholar

Abstract
This paper presents an efficient imaging algorithm for Terrain Observation by Progressive Scans (TOPS) mode SAR raw data focusing. First, the use of sub-aperture is adopted to overcome the aliased Doppler spectra due to progress azimuth beam scanning. Afterwards, range compression and range cell migration correction (RCMC) are individually implemented in each azimuth block with its individual Doppler centroid. After azimuth sub-aperture signal recombination, a new Doppler centroid varying rate is introduced to avoid the reconstructed Doppler spectra wrapping. Moreover, azimuth varying beam center time is removed by azimuth frequency scaling before the final azimuth spectrum analysis (SPECAN) step. Finally, the conventional Fourier transform (FT) is replaced by the scaled Fourier transform (SCFT) step to obtain the uniform azimuth space sampling interval. Since the proposed imaging algorithm is without any interpolations and azimuth data extension, it is highly efficient. Simulation results on point targets validate the proposed algorithm.
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Citation
Pingping Huang, and Wei Xu, "An Efficient Imaging Approach for Tops SAR Data Focusing Based on Scaled Fourier Transform," Progress In Electromagnetics Research B, Vol. 47, 297-313, 2013.
doi:10.2528/PIERB12081804
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