Radix- N Resolution-Fusion for LASAR via Orthogonal Complement Decomposition

This letter concerns the resolution-fusion method for linear array 3-D imaging SAR (LASAR). Limited by the length of the linear array, the cross-track resolution of LASAR is often lower than that in the along-track direction. To overcome this disadvantage, we assume that there are two LASAR systems...

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Bibliographic Details
Published in:IEEE geoscience and remote sensing letters 2009-01, Vol.6 (1), p.147-151
Main Authors: Jun, S., Xiaoling, Z., Jianyu, Y., Junjie, W.
Format: Article
Language:English
Subjects:
Aperture antennas
Baseband
Complement
Computed tomography
Data processing
Decomposition
Directive antennas
Distortion
Fuses
Light scattering
Linear array 3-D imaging synthetic aperture radar (LASAR)
Linear arrays
Noise
orthogonal complement decomposition
Radar antennas
Radar scattering
resolution fusion
Signal resolution
Spatial resolution
Synthetic aperture radar
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Summary:This letter concerns the resolution-fusion method for linear array 3-D imaging SAR (LASAR). Limited by the length of the linear array, the cross-track resolution of LASAR is often lower than that in the along-track direction. To overcome this disadvantage, we assume that there are two LASAR systems whose trajectories are orthogonal to each other. Thus, we obtain a row low-resolution image and a column low-resolution image of the same scene. Using the orthogonal complement decomposition technique, we fuse the two images into one quasi-high-resolution image. Moreover, we find that the fusion distortion is unavoidable and contains the high-frequency component in both row and column directions. The information loss ratio is ( N - 1) 2 / N 2 ( N denotes the ratio of low resolution to high resolution). For a smooth image, the energy loss ratio is near to zero. With the increase of the noise energy, the energy loss ratio increases correspondingly. When the noise submerges the image completely, the energy loss ratio converges to the information loss ratio.
ISSN:1545-598X
1558-0571
DOI:10.1109/LGRS.2008.2009951