Study of nonlinear phase error correction technique for synthetic aperture ladar

De'an Liu; Enwen Dai; Nan Xu; Liren Liu

doi:10.1117/12.826002

1 September 2009 Study of nonlinear phase error correction technique for synthetic aperture ladar

De'an Liu, Enwen Dai, Nan Xu, Liren Liu

Proceedings Volume 7442, Optics and Photonics for Information Processing III; 744214 (2009) https://doi.org/10.1117/12.826002
Event: SPIE Optical Engineering + Applications, 2009, San Diego, California, United States

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.

Citation Download Citation

De'an Liu, Enwen Dai, Nan Xu, and Liren Liu "Study of nonlinear phase error correction technique for synthetic aperture ladar", Proc. SPIE 7442, Optics and Photonics for Information Processing III, 744214 (1 September 2009); https://doi.org/10.1117/12.826002

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