Volume 12 Issue 6
Dec.  2023
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Article Navigation >  Journal of Radars  > 2023  >  12(6): 1155-1165
WANG Xinshuo, LU Jingyue, MENG Zhichao, et al. Forward-looking multi-channel synthetic aperture radar imaging and array attitude error compensation[J]. Journal of Radars, 2023, 12(6): 1155–1165. doi: 10.12000/JR23073
Citation: WANG Xinshuo, LU Jingyue, MENG Zhichao, et al. Forward-looking multi-channel synthetic aperture radar imaging and array attitude error compensation[J]. Journal of Radars, 2023, 12(6): 1155–1165. doi: 10.12000/JR23073
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Forward-looking Multi-channel Synthetic Aperture Radar Imaging and Array Attitude Error Compensation

DOI: 10.12000/JR23073
  • 1.

    School of Electronics and Communication Engineering, Shenzhen Campus of Sun Yat-sen University, Shenzhen 518107, China

  • 2.

    School of Computer Science and Technology, Xidian University, Xi’an 710071, China

Funds:  The National Natural Science Foundation of China (62101603)
More Information
  • Corresponding author: LU Jingyue, lujingyue@xidian.edu.cn
  • Received Date: 2023-05-08
  • Rev Recd Date: 2023-07-20
    • Available Online: 2023-07-25
  • Publish Date: 2023-08-09
    Abstract
  • To solve the problem of left-right Doppler ambiguity in forward-looking Synthetic Aperture Radar (SAR) imaging, Forward-Looking Multi-Channel SAR (FLMC-SAR) can achieve Doppler ambiguity resolving imaging through beamforming. However, array deviation angle and time-varying platform attitude errors lead to the mismatch between the space and time characteristics of a target, which affects the Doppler ambiguity resolving imaging performance. This study proposes an FLMC-SAR imaging and array attitude error compensation method. First, the three-dimensional FLMC-SAR array deviation-angle error and time-varying platform attitude error models are established. The mechanism of matching the spatiotemporal characteristics of targets in the two-dimensional spatiotemporal spectrum plane is analyzed. In addition, a representation model is established to study the spatiotemporal characteristics mismatch caused by the array attitude error in the spatiotemporal plane. Thereafter, based on the non-left-right spatial variation of the error, we propose a method of adding an error compensation phase to the back projection function to uniformly compensate the array attitude error of left-right symmetric targets. The results of simulation experiments show that the proposed method can achieve FLMC-SAR array attitude correction and error compensation, enhance the performance of forward-looking Doppler ambiguity suppression, and ensure the azimuth resolution performance of forward-looking imaging.

     

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