微波成象中多采樣率信號預(yù)處理方法
AN EFFICIENT MUL TIRATE PREPROCESSING TECHNIQUE FOR MICROWAVE IMAGING
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摘要: 在實(shí)際微波成象系統(tǒng)中,其模糊成象窗口往往遠(yuǎn)大于目標(biāo)成象窗口。據(jù)此我們提出一種有效的成象前多采樣率預(yù)處理方法。它可以很好地壓縮原始頻域數(shù)據(jù),降低成象處理數(shù)據(jù)量和對計算機(jī)存儲空間的要求,提高數(shù)字成象處理效率。為驗(yàn)證該方法的可行性,文中最后給出了對微波暗室采集數(shù)據(jù)的處理結(jié)果。
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關(guān)鍵詞:
- 微波/雷達(dá)成象; 多采樣率處理; 成象算法
Abstract: A effective multirate preprocessing technique for microwave imaging is presented. This technique has the advantages of largely compressing the original collected spectral data and reducing computational complexity of some imaging alogrithms. Also, the preprocessed spectral data is suitable for off-line superresolution imaging processing. -
D. L. Mensa, High Resolution Cross-Section Imaging, Artech House, (1991), chs. 2, 3.[2]張澄波著,綜合孔徑雷達(dá)一一原理、系統(tǒng)分析和應(yīng)用,科學(xué)出版社,北京,1989年.[3]D. C. Ausherman et al., Development in Radar Imaging, IEEE Trans. on AES, AE$-20(1984)4, 363-398.[4]R. E. Crochiere et al., Interpolation and Decimation of Digital Signal, Proc. IEEE, 69 (1981)3, 300-331.[5]O. Rioul, M. Vetterli, Wavelets and Signal Processing, IEEE Signal Processing Magazine, Oct. 1991, pp. 14-18.[6]T. W. Parks et al., Chebyshev Approximation for Nonrecursive Digital Filters with Linear Phase, IEEE Trans. on CT, CT-19(1972)3, 189-194. -
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