1 JunjieWu_IGARSS11.ppt

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  • 1. Univ. of Electro. Sci. & Tech. of China Junjie Wu , Jianyu Yang, et.al. First Result of B istatic F orward- l ooking SAR with Stationary Transmitter
  • 2. Contents
    • Introduction
    • System Setup
    • Experimental result of stationary transmitter BFSAR
    • Current work
  • 3. May, 12 th , Sichuan May, 12 th , Sichuan Mar, 11 th , Tohuku
  • 4. Side-looking Squint-looking Squint-looking Backward-looking Forward-looking 1.Introduction
  • 5. 1.Introduction
    • Obstruction warning
    • Scene matching guidance
    • Self-landing
    • Self-navigation
    • Materials and/or troop dropping
    Forward-looking radar imaging : Forward Squint SAR Forward Squint SAR Boresight SAR Boresight SAR Forward looking radar
  • 6.
    • Why can not SAR work in forward-looking mode?
    1.Introduction
  • 7. SAR imaging conditions :
    • there is enough separation angle---- 2D resolution
    • sole intersection---- No ambiguity
    Iso-range and Iso-Doppler lines — 1.Introduction Monostatic SAR Iso-range and Iso-Doppler lines
    • Monostatic SAR imaging area :
    • Iso-range and Iso-Doppler lines are orthogonal
    • Sole intersection
  • 8. Monostatic SAR Iso-range and Iso-Doppler lines
    • Monostatic SAR forward-looking area :
    • Iso-range and Iso-Doppler lines are parallel
    • Double intersections
    Monostatic SAR : can not image the forward-looking area 1.Introduction
  • 9.
    • What can we do?
    Separate the transmitter and receiver Bistatic 1.Introduction
  • 10. Bistatic SAR : can image the forward-looking area of the receive station Bistatic SAR Iso-range and Iso-Doppler lines
    • Bistatic SAR forward-looking area :
    • Iso-range and Iso-Doppler lines are not parallel
    • Sole intersections
    1.Introduction
  • 11.
    • Transmitter Side-looking or Squint
    • Receiver forward-looking
    BFSAR with two moving platforms
    • Spaceborne transmitter——Airborne receiver
    • Airborne transmitter——Airborne receiver
    • Reconnaissance
    • Self-navigation
    • Air-drop
    Transmitter Side-looking Receiver Forward-looking 1.Introduction
  • 12. FGAN-Germany Spaceborne transmitter side-looking Airborne receiver backward-looking
    • Spaceborne/airborne bistatic backward-looking experiment (2009.12)
    BFSAR 1.Introduction Resolution : 1-3m Area: 3 × 5km
  • 13. Forward-looking Receiver Stationary transmitter 1.Introduction Stationary Transmitter (ST) BFSAR
    • Transmitter----high tower, mountain, geostationary satellite, stratosphere low speed airship…
    • Receiver----airborne
    • Reconnaissance
    • Self-navigation
    • Air-drop
  • 14. (a) monostatic FSAR (b) ST-BFSAR 1.Introduction Imaging principle of ST-BFSAR
  • 15. 2.System Setup Vector Signal Generator Agilent 8267D Stationary Transmitter Wideband signal receiver target Vehicle-borne Moving Receiver
  • 16. 2.System Setup Bandwidth: 80MHz PRF: 500Hz Pulse Width: 20us Receiver velocity: 7m/s Carrier Frequency: 9.6GHz System parameters
  • 17. 2.System Setup Downward-looking angle is too small Target Upward forward-looking Downward forward-looking Equivalent
  • 18. 2.System Setup
  • 19. 3. Experimental results Slow time domain Doppler domain
  • 20. Imaging result of ST-BFSAR 3. Experimental results
  • 21. 4.Current Work A O B C A O B A O C B A O 2D spatial variance
  • 22. 4.Current Work Keystone -based azimuth nonlinear Chirp Scaling imaging algorithm Keystone transform : Correct the linear range walk of all targets ----remove the variance of range migration NLCS : Equalize the FM rates of all targets ---- remove the variance of azimuth FM rate
  • 23. Thank you