Share Email Print
cover

Proceedings Paper

Phase error suppression by low-pass filtering for synthetic aperture imaging ladar
Author(s): Zhiwei Sun; Peipei Hou; Ya'nan Zhi; Jianfeng Sun; Yu Zhou; Qian Xu; Zhiyong Lu; Liren Liu
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper 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.

Paper Details

Date Published: 18 September 2014
PDF: 10 pages
Proc. SPIE 9227, Unconventional Imaging and Wavefront Sensing 2014, 92270F (18 September 2014); doi: 10.1117/12.2060472
Show Author Affiliations
Zhiwei Sun, Shanghai Institute of Optics and Fine Mechanics (China)
Peipei Hou, Shanghai Institute of Optics and Fine Mechanics (China)
Ya'nan Zhi, Shanghai Institute of Optics and Fine Mechanics (China)
Jianfeng Sun, Shanghai Institute of Optics and Fine Mechanics (China)
Yu Zhou, Shanghai Institute of Optics and Fine Mechanics (China)
Qian Xu, Shanghai Institute of Optics and Fine Mechanics (China)
Zhiyong Lu, Shanghai Institute of Optics and Fine Mechanics (China)
Liren Liu, Shanghai Institute of Optics and Fine Mechanics (China)


Published in SPIE Proceedings Vol. 9227:
Unconventional Imaging and Wavefront Sensing 2014
Jean J. Dolne; Thomas J. Karr; Victor L. Gamiz, Editor(s)

© SPIE. Terms of Use
Back to Top