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Application of improved equivalent edge currents in synthetic aperture radar imaging

Journal of Systems Engineering and Electronics 2010年第4期21卷 566-571页

作者： Yanwei Zhao Ping Zhou Xiangyang Zhang Min Zhang School of Science Xidian University Xi'an 710071 R R. China National Electromagnetic Scattering Laboratory Beijing 100854 E R. China

Target modeling and scattering function calculating are important prerequisites and groundwork for the synthetic aperture radar（SAR） imaging *** to the difficult problems that normal methods cannot calculate the scattering function of electrically large object under the condition to wideband,an effective method of improved equivalent edge currents is presented and applied to SAR imaging simulation for the first *** method improves calculating velocity and has relatively high *** concrete steps of applying the method are *** way of the simulation experiment,the effectiveness of the method is verified.

关键词： modeling and simulation improved equivalent edge currents synthetic aperture radar image scattering function.

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SAR image denoising based on wavelet-fractal analysis

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Journal of Systems Engineering and Electronics 2007年第1期18卷 45-48页

作者： Zhao Jian Cao Zhengwen Zhou Mingquan School of Electronics and Information Northwestern Polytechnical Univ. Xi'an 710072 E R. China School of Information Science and Technology Northwest Univ. Xi'an 710069 E R. China

Wavelet-fractal based SAR （synthetic aperture radar） image processing is one of the advanced technologies in image processing. The main concept of analysis is that after wavelet transformation, multifractal spectrum of the signal is different from that of noise. This difference is used to alleviate the noise produced by SAR *** method to denoise SAR image using the process based on wavelet-fractai analysis is discussed in detail. Essentially, the present method focuses on adjusting the Hoelder exponent α of multifractal spectrum. After simulation, α should be adjusted to 1.72-1.73. The more the value of α exceeds 1.73, the less distinctive the edges of SAR image become. According to the authors denoising is optimal at α=1.72-1.73. In other words, when α =1.72-1.73, a smooth and denoised SAR image is produced.

关键词： synthetic aperture radar image Wavelet Multifractal analysis Denoising Hoelder exponent

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