Ms. Meiling Kang Profile

Meiling Kang

at Univ of Electronic Science and Technology of China

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Proceedings Article | 30 October 2009 Paper

Reconstruction of uncompleted frequency spectrum images based on Fourier telescopy

Meiling Kang, Chunping Yang, Jian Wu

Proceedings Volume 7495, 74954G (2009) https://doi.org/10.1117/12.832585

KEYWORDS: Fourier transforms, Linear filtering, Imaging systems, Image restoration, Image resolution, Satellites, Image filtering, Laser imaging, Antennas, Spatial frequencies

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Fourier Telescopy (FT), an active laser imaging technique, is a good choice for high resolution imaging systems, which can be used to obtain satellite images from geosynchronous orbit targets. These images maybe lose part of frequency spectrum due to the limitation of the separation of the transmitter apertures (STA) and antenna array arrangements, etc. In this paper, the impact on image reconstruction of active laser imaging technique owing to the uncompleted degree of spectrum is mainly discussed. First, the FT imaging theory and frequency sampling technology are introduced. Then, the basic principle of image reconstruction is analyzed. The defective high frequency spectrum which is caused by the limitation of STA is replaced by zero (zero padding method for short). And the spectrum defective degree is approximately treated as the results of original target images passing through an ideal low-pass filter. Finally, the image reconstruction program is designed and the uncompleted frequency spectrum images are simulated with the method of zero padding. Simulation results show that images begin to become blurring when the cutoff frequency of the ideal low-pass filter is 10% lower than the width of the after padding original images.

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