Algorithm of matched filtering overcoming nonlinear chirp effect in synthetic aperture ladar

Wei Lu; Nan Xu; Liren Liu

doi:10.1117/12.824684

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1 September 2009 Algorithm of matched filtering overcoming nonlinear chirp effect in synthetic aperture ladar

Wei Lu, Nan Xu, Liren Liu

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Proceedings Volume 7442, Optics and Photonics for Information Processing III; 744210 (2009) https://doi.org/10.1117/12.824684
Event: SPIE Optical Engineering + Applications, 2009, San Diego, California, United States

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.

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Wei Lu, Nan Xu, and Liren Liu "Algorithm of matched filtering overcoming nonlinear chirp effect in synthetic aperture ladar", Proc. SPIE 7442, Optics and Photonics for Information Processing III, 744210 (1 September 2009); https://doi.org/10.1117/12.824684

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