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Bistatic Forward-Looking SAR with Stationary Transmitter: Experimental Results and Current Work

This paper presents the experimental results of a bistatic forward-looking synthetic aperture radar (SAR) system with a stationary transmitter. It explores the system setup, imaging principles, and current work focusing on implementing a keyston-based azimuth nonlinear chirp scaling imaging algorithm. The discussion includes the imaging conditions, bistatic SAR areas, and the advantages of separating the transmitter and receiver. The study aims to enhance reconnaissance, self-navigation, and air-drop capabilities through innovative SAR technology.

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Bistatic Forward-Looking SAR with Stationary Transmitter: Experimental Results and Current Work

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  1. First Result of Bistatic Forward-looking SAR with Stationary Transmitter Junjie Wu, Jianyu Yang, et.al. Univ. of Electro. Sci. & Tech. of China

  2. Contents • Introduction • System Setup • Experimental result of stationary transmitter BFSAR • Current work

  3. May, 12th, Sichuan May, 12th, Sichuan Mar, 11th, Tohuku

  4. 1.Introduction Forward-looking Squint-looking Side-looking Squint-looking Backward-looking

  5. 1.Introduction Forward-looking radar imaging： • Obstruction warning • Scene matching guidance • Self-landing • Self-navigation • Materials and/or troop dropping Forward looking radar Forward Squint SAR Forward Squint SAR Boresight SAR Boresight SAR

  6. 1.Introduction Why can not SAR work in forward-looking mode?

  7. Monostatic SAR imaging area： • Iso-range and Iso-Doppler lines are orthogonal • Sole intersection Monostatic SAR Iso-range and Iso-Doppler lines 1.Introduction SAR imaging conditions： Iso-range and Iso-Doppler lines — • there is enough separation angle----2D resolution • sole intersection----No ambiguity

  8. 1.Introduction • Monostatic SAR forward-looking area： • Iso-range and Iso-Doppler lines are parallel • Double intersections Monostatic SAR Iso-range and Iso-Doppler lines Monostatic SAR：can not image the forward-looking area

  9. 1.Introduction What can we do? Separate the transmitter and receiver Bistatic

  10. 1.Introduction • Bistatic SAR forward-looking area： • Iso-range and Iso-Doppler lines arenot parallel • Sole intersections Bistatic SAR Iso-range and Iso-Doppler lines Bistatic SAR： canimage the forward-looking area of the receive station

  11. 1.Introduction BFSAR with two moving platforms • Transmitter Side-looking or Squint • Receiver forward-looking Transmitter Side-looking • Spaceborne transmitter——Airborne receiver • Airborne transmitter——Airborne receiver Receiver Forward-looking • Reconnaissance • Self-navigation • Air-drop

  12. 1.Introduction BFSAR FGAN-Germany • Spaceborne/airborne bistatic backward-looking experiment(2009.12) Spaceborne transmitter side-looking Resolution：1-3m Area:3×5km Airborne receiver backward-looking

  13. 1.Introduction Stationary Transmitter (ST) BFSAR Stationary transmitter • Transmitter----high tower, mountain, geostationary satellite, stratosphere low speed airship… • Receiver----airborne Forward-looking Receiver • Reconnaissance • Self-navigation • Air-drop

  14. 1.Introduction Imaging principle of ST-BFSAR (a) monostatic FSAR (b) ST-BFSAR

  15. 2.System Setup Stationary Transmitter Vector Signal Generator Agilent 8267D target Vehicle-borne Moving Receiver Wideband signal receiver

  16. 2.System Setup System parameters Carrier Frequency: 9.6GHz Bandwidth: 80MHz PRF: 500Hz Pulse Width: 20us Receiver velocity: 7m/s

  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. 3. Experimental results Imaging result of ST-BFSAR

  21. 4.Current Work A A A A C O O O C O B B B 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

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