Resampling technique in the orthogonal direction for down-looking Synthetic Aperture Imaging Ladar

Guangyuan Li; Jianfeng Sun; Zhiyong Lu; Ning Zhang; Guangyu Cai; Zhiwei Sun; Liren Liu

doi:10.1117/12.2186131

4 September 2015 Resampling technique in the orthogonal direction for down-looking Synthetic Aperture Imaging Ladar

Guangyuan Li, Jianfeng Sun, Zhiyong Lu, Ning Zhang, Guangyu Cai, Zhiwei Sun, Liren Liu

Proceedings Volume 9617, Unconventional Imaging and Wavefront Sensing 2015; 96170N (2015) https://doi.org/10.1117/12.2186131
Event: SPIE Optical Engineering + Applications, 2015, San Diego, California, United States

Abstract

The implementation of down-looking Synthetic Aperture Imaging Ladar(SAIL) uses quadratic phase history reconstruction in the travel direction and linear phase modulation reconstruction in the orthogonal direction. And the linear phase modulation in the orthogonal direction is generated by the shift of two cylindrical lenses in the two polarization-orthogonal beams. Therefore, the fast-moving of two cylindrical lenses is necessary for airborne down-looking SAIL to match the aircraft flight speed and to realize the compression of the orthogonal direction, but the quick start and the quick stop of the cylindrical lenses must greatly damage the motor and make the motion trail non-uniform. To reduce the damage and get relatively well trajectory, we make the motor move like a sinusoidal curve to make it more realistic movement, and through a resampling interpolation imaging algorithm, we can transform the nonlinear phase to linear phase, and get good reconstruction results of point target and area target in laboratory. The influences on imaging quality in different sampling positions when the motor make a sinusoidal motion and the necessity of the algorithm are analyzed. At last, we perform a comparison of the results of two cases in resolution.

Citation Download Citation

Guangyuan Li, Jianfeng Sun, Zhiyong Lu, Ning Zhang, Guangyu Cai, Zhiwei Sun, and Liren Liu "Resampling technique in the orthogonal direction for down-looking Synthetic Aperture Imaging Ladar", Proc. SPIE 9617, Unconventional Imaging and Wavefront Sensing 2015, 96170N (4 September 2015); https://doi.org/10.1117/12.2186131

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available