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Proceedings Paper

Algorithm of matched filtering overcoming nonlinear chirp effect in synthetic aperture ladar
Author(s): Wei Lu; Nan Xu; Liren Liu
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Paper Abstract

Linear chirp laser signal is often employed as the transmitted signal of synthetic aperture laser radar (SAL). However, actual properties of frequency sweep of fiber laser always produces nonlinear terms such as quadratic and higher order terms. Existence of nonlinear terms of frequency produces phase errors during pulse time, leading to blurring of target in range direction and further reduces imaging resolution of range direction. It makes compensation of the nonlinear chirp from laser source a requirement. In this paper, we develop an algorithm of matched filtering in frequency spectrum to overcome the phase error from nonlinear chirp. The results of simulation show that the image in range direction can be well compressed. At the same time, we also analyze effects of signal compression in the range direction under different parameter situations such as reference channel length as well as ratio of nonlinear contribution.

Paper Details

Date Published: 1 September 2009
PDF: 13 pages
Proc. SPIE 7442, Optics and Photonics for Information Processing III, 744210 (1 September 2009); doi: 10.1117/12.824684
Show Author Affiliations
Wei Lu, Shanghai Institute of Optics and Fine Mechanics (China)
Nan Xu, Shanghai Institute of Optics and Fine Mechanics (China)
Liren Liu, Shanghai Institute of Optics and Fine Mechanics (China)

Published in SPIE Proceedings Vol. 7442:
Optics and Photonics for Information Processing III
Khan M. Iftekharuddin; Abdul Ahad Sami Awwal, Editor(s)

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