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Acta Optica Sinica, Volume. 39, Issue 7, 0728002(2019)

Elementary Imaging Theory on Space-Borne Synthetic Aperture Ladar

Danyang Li1,2, Jin Wu1,2、*, Lei Wan1,2, Debin Wang1,2, and Tong Wu1,2
Author Affiliations
  • 1 Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China
  • 2 School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
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    AbstractGet PDF(in Chinese)
    Figures&Tables (9)
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    References (20)
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    Figures & Tables(9)
    Orbit of space-borne SAL and observed space target

    Fig. 1. Orbit of space-borne SAL and observed space target

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    Schematic of space-borne SAL data acquisition

    Fig. 2. Schematic of space-borne SAL data acquisition

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    Coordinate system of space-borne SAL

    Fig. 3. Coordinate system of space-borne SAL

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    Flow chart of space-borne SAL imaging algorithm

    Fig. 4. Flow chart of space-borne SAL imaging algorithm

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    Azimuth resolution graph

    Fig. 5. Azimuth resolution graph

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    SNR curves computed from Eq. 15

    Fig. 6. SNR curves computed from Eq. 15

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    Space-borne SAL imaging with squint angle. (a) Target; (b) squint angle is 0°; (c) squint angle is 5°; (d) squint angle is -5°; (e) corrected image of (c); (f) corrected image of (d)

    Fig. 7. Space-borne SAL imaging with squint angle. (a) Target; (b) squint angle is 0°; (c) squint angle is 5°; (d) squint angle is -5°; (e) corrected image of (c); (f) corrected image of (d)

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    Space-borne SAL imaging of weak return signal. (a) SNR is 0.3; (b) image after superposition

    Fig. 8. Space-borne SAL imaging of weak return signal. (a) SNR is 0.3; (b) image after superposition

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    • Table 1. Basic parameters of simulation

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      Table 1. Basic parameters of simulation

      ParameterValue
      Orbit radius of space-borne SAL R1 /km41978
      Orbit radius of GEO target R2 /km42178
      Wavelength λ /nm1550
      Bandwidth B /GHz3
      Pulse width τpul /μs10
      Range of squint angle θp /(°)-5 to 5
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    Danyang Li, Jin Wu, Lei Wan, Debin Wang, Tong Wu. Elementary Imaging Theory on Space-Borne Synthetic Aperture Ladar[J]. Acta Optica Sinica, 2019, 39(7): 0728002

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    Paper Information

    Category: Remote Sensing and Sensors

    Received: Jan. 22, 2019

    Accepted: Mar. 21, 2019

    Published Online: Jul. 16, 2019

    The Author Email: Wu Jin (jwu@mail.ie.ac.cn)

    DOI:10.3788/AOS201939.0728002

    Topics

    laser devices and laser physics
    Lasers and Laser Optics
    Laser physics
    laser manufacturing
    Instrumentation, Measurement and Metrology