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Volume 28 Issue 6
Jun.  2002
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Journal of Beijing University of Aeronautics and Astronautics  > 2002  >  28(6): 643-647.
WANG Guo-dong, ZHOU Yin-qing, LI Chun-shenget al. Precise Imaging Processing for Spaceborne Spotlight SAR[J]. Journal of Beijing University of Aeronautics and Astronautics, 2002, 28(6): 643-647. (in Chinese)
Citation: WANG Guo-dong, ZHOU Yin-qing, LI Chun-shenget al. Precise Imaging Processing for Spaceborne Spotlight SAR[J]. Journal of Beijing University of Aeronautics and Astronautics, 2002, 28(6): 643-647. (in Chinese)
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Precise Imaging Processing for Spaceborne Spotlight SAR

  • Beijing University of Aeronautics and Astronautics, Dept. of Electronic Engineering

  • Received Date: 10 May 2001
  • Publish Date: 30 Jun 2002
    Abstract
  • Signal properties of spaceborne spotlight SAR were discussed. The relationships of centroid Doppler, Doppler bandwidth and PRF(Pluse Repetition Frequency) with squint angle were analyzed. Based on a modified Chirp Scaling algorithm, a subaperture method was used in this algorithm. With the subaperture method, data rate and radar transmit peak power can be effectively reduced, the time-variant of Doppler center frequency can be resolved. In addition, the necessities of yaw steering were analyzed, a yaw steering rule was given. It was proved that yaw steering can be used to decrease range migration and to reduce imaging difficulties. The validity of the processing method was tested by computer simulation.

     

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    • References(1)
  • [1] Carrara W G, Goodman R S, Majewski R M. Spotlight synthetic aperture radar[M]. London:Artech House, 1995. 81~471. [2]黄 岩, 李春升, 陈 杰, 等. 高分辨星载SAR改进Chirp Scaling成像算法 . 电子学报, 2000, 28(3):35~38. [3]Davidson G W, Cumming I. Signal properties of spaceborne squint-mode SAR[J]. IEEE Transactions on Geoscience Remote Sensing, 1997, 35(5):611~617. [4]Mittermayer J, Moreira A, Loffeld O. Spotlight SAR data processing using the frequency scaling algorithm[J]. IEEE Transactions on Geoscience Remote Sensing, 1999, 37(5):2198~2214.
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