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

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

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

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

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

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

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 Monostatic SAR Iso-range and Iso-Doppler lines Monostatic SAR imaging area： Iso-range and Iso-Doppler lines are orthogonal Sole intersection

Monostatic SAR Iso-range and Iso-Doppler lines 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

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

Bistatic SAR Iso-range and Iso-Doppler lines 1.Introduction Bistatic SAR forward-looking area： Iso-range and Iso-Doppler lines are not parallel Sole intersections Bistatic SAR Iso-range and Iso-Doppler lines Bistatic SAR： can image the forward-looking area of the receive station

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

Spaceborne transmitter side-looking Airborne receiver backward-looking 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

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

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

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

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

Upward forward-looking Downward forward-looking 2.System Setup Downward-looking angle is too small Target Upward forward-looking Downward forward-looking Equivalent

2.System Setup

3. Experimental results Slow time domain Doppler domain

Imaging result of ST-BFSAR 3. Experimental results Imaging result of ST-BFSAR

4.Current Work A A A A C O O O C O B B B 2D spatial variance

Keystone-based azimuth nonlinear Chirp Scaling imaging algorithm 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

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