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Proceedings Paper

Study of nonlinear phase error correction technique for synthetic aperture ladar
Author(s): De'an Liu; Enwen Dai; Nan Xu; Liren Liu
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Paper Abstract

Based on Fourier transform of heterodyne signal and linear fitting of phase time-evolution, a nonlinearity-induced phase error correction technique for synthetic aperture ladar is experimentally studied. The problem of beat frequency matching in the conventional method for nonlinearity-induced phase error correction in target channel by designing a reference channel and phase shift equations is practically analyzed, and its limitation on application under the condition of large time delay in target channel is verified. According to this problem, a new method of directly nonlinearity-induced phase error correction by linear fitting of phase time-evolution in target channel is proposed. In experiments, the rang resolution of 2 mm is gained at 1.5 μm wavelength, which is coincident well with theory. The results show that this technique can overcome the problem of beat frequency matching in two channels and is effective for practical applications with different time delay in target channel.

Paper Details

Date Published: 1 September 2009
PDF: 7 pages
Proc. SPIE 7442, Optics and Photonics for Information Processing III, 744214 (1 September 2009); doi: 10.1117/12.826002
Show Author Affiliations
De'an Liu, Shanghai Institute of Optics and Fine Mechanics (China)
Enwen Dai, 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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