1 JunjieWu_IGARSS11.ppt


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1 JunjieWu_IGARSS11.ppt

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