Mr. Zhili Hua Profile

Zhili Hua

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Proceedings Article | 29 August 2009 Paper

A hybrid method for synthetic aperture ladar phase-error compensation

Zhili Hua, Hongping Li, Yongjian Gu

Proceedings Volume 7382, 73822D (2009) https://doi.org/10.1117/12.835290

KEYWORDS: Deconvolution, Point spread functions, LIDAR, Distortion, Doppler effect, Signal to noise ratio, Backscatter, Synthetic aperture radar, Image resolution, Atmospheric turbulence

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As a high resolution imaging sensor, synthetic aperture ladar data contain phase-error whose source include uncompensated platform motion and atmospheric turbulence distortion errors. Two previously devised methods, rank one phase-error estimation algorithm and iterative blind deconvolution are reexamined, of which a hybrid method that can recover both the images and PSF's without any a priori information on the PSF is built to speed up the convergence rate by the consideration in the choice of initialization. To be integrated into spotlight mode SAL imaging model respectively, three methods all can effectively reduce the phase-error distortion. For each approach, signal to noise ratio, root mean square error and CPU time are computed, from which we can see the convergence rate of the hybrid method can be improved because a more efficient initialization set of blind deconvolution. Moreover, by making a further discussion of the hybrid method, the weight distribution of ROPE and IBD is found to be an important factor that affects the final result of the whole compensation process.

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