Phase error suppression by low-pass filtering for synthetic aperture imaging ladar

Zhiwei Sun; Peipei Hou; Ya'nan Zhi; Jianfeng Sun; Yu Zhou; Qian Xu; Zhiyong Lu; Liren Liu

doi:10.1117/12.2060472

18 September 2014 Phase error suppression by low-pass filtering for synthetic aperture imaging ladar

Zhiwei Sun, Peipei Hou, Ya'nan Zhi, Jianfeng Sun, Yu Zhou, Qian Xu, Zhiyong Lu, Liren Liu

Proceedings Volume 9227, Unconventional Imaging and Wavefront Sensing 2014; 92270F (2014) https://doi.org/10.1117/12.2060472
Event: SPIE Optical Engineering + Applications, 2014, San Diego, California, United States

Abstract

Compared to synthetic aperture radar (SAR), synthetic aperture imaging ladar (SAIL) is more sensitive to the phase errors induced by atmospheric turbulence, undesirable line-of-sight translation-vibration and waveform phase error, because the light wavelength is about 3-6 orders of magnitude less than that of the radio frequency. This phase errors will deteriorate the imaging results. In this paper, an algorithm based on low-pass filtering to suppress the phase error is proposed. In this algorithm, the azimuth quadratic phase history with phase error is compensated, then the fast Fourier transform (FFT) is performed in azimuth direction, after the low-pass filtering, the inverse FFT is performed, then the image is reconstructed simultaneously in the range and azimuth direction by the two-dimensional (2D) FFT. The highfrequency phase error can be effectively eliminated hence the imaging results can be optimized by this algorithm. The mathematical analysis by virtue of data-collection equation of side-looking SAIL is presented. The theoretical modeling results are also given. In addition, based on this algorithm, a principle scheme of optical processor is proposed. The verified experiment is performed employing the data obtained from a SAIL demonstrator.

Citation Download Citation

Zhiwei Sun, Peipei Hou, Ya'nan Zhi, Jianfeng Sun, Yu Zhou, Qian Xu, Zhiyong Lu, and Liren Liu "Phase error suppression by low-pass filtering for synthetic aperture imaging ladar", Proc. SPIE 9227, Unconventional Imaging and Wavefront Sensing 2014, 92270F (18 September 2014); https://doi.org/10.1117/12.2060472

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

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
10 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Linear filtering

Image filtering

Synthetic aperture radar

Fourier transforms

Optical filters

Image processing

LIDAR

Show All Keywords

Keywords/Phrases

Search In:

Publication Years