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ZHOU Tao, JIN Guodong, LU Pingping, et al. A phase synchronization method for miniature multistatic FMCW SAR[J]. Journal of Radars, in press. doi: 10.12000/JR24198
Citation: ZHOU Tao, JIN Guodong, LU Pingping, et al. A phase synchronization method for miniature multistatic FMCW SAR[J]. Journal of Radars, in press. doi: 10.12000/JR24198
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A Phase Synchronization Method for Miniature Multistatic FMCW SAR

DOI: 10.12000/JR24198
  • 1.

    Key Laboratory of Radar Imaging and Microwave Photonics, Ministry of Education, College of Electronic Information Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China

  • 2.

    Nanjing University of Aeronautics and Astronautics Shenzhen Research Institute, Shenzhen 518000, China

  • 3.

    Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, China

  • 4.

    National Key Laboratory of Microwave Imaging, Beijing 100190, China

Funds:  The National Natural Science Foundation of China (62101248), The Natural Science Foundation of Jiangsu Province (BK20210282), The Guangdong Basic and Applied Basic Research Foundation (2020B1515120060), The Shenzhen Science and Technology Program (JCYJ20230807142000001), The Fundamental Research Funds for the Central Universities (NT2023008)
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  • Corresponding author: JING Guodong, jinguodong@nuaa.edu.cn
  • Received Date: 2024-10-08
  • Rev Recd Date: 2024-11-11
    • Available Online: 2024-11-11
    Abstract
  • The miniature multistatic Synthetic Aperture Radar (SAR) system uses a flexible configuration of transceiver division compared with the miniature monostatic SAR system, thereby affording the advantages of multi-angle imaging. As the transceiver-separated SAR system uses mutually independent oscillator sources, phase synchronization is necessary for high-precision imaging of the miniature multistatic SAR. Although current research on phase synchronization schemes for bistatic SAR is relatively mature, these schemes are primarily based on the pulse SAR system. However, a paucity of research exists on phase synchronization for the miniature multistatic Frequency Modulated Continuous Wave (FMCW) SAR. In comparison with the pulse SAR, the FMCW SAR system lacks a temporal interval between the transmitted pulses. Consequently, some phase synchronization schemes developed for the pulse SAR system cannot be directly applied to the FMCW SAR system. To this end, this study proposes a novel phase synchronization method for the miniature multistatic FMCW SAR, effectively resolving the problem of the FMCW SAR. This method uses the generalized Short-Time Shift-Orthogonal (STSO) waveform as the phase synchronization signal of disparate radar platforms. The phase error between the radar platforms can be effectively extracted through pulse compression to realize phase synchronization. Compared with the conventional linear frequency-modulated waveform, after the generalized STSO waveform is pulsed by the same pulse compression function, the interference signal energy is concentrated away from the peak of the matching signal and the phase synchronization accuracy is enhanced. Furthermore, the proposed method is adapted to the characteristics of dechirp reception in FMCW miniature multistatic SAR systems, and ground and numerical simulation experiments verify that the proposed method has high synchronization accuracy.

     

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