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Volume 26 Issue 11
Nov.  2004
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Yang De-Zhao, Ou Pan , Lin Zhi-Li, Song Ning-Fang. High-accuracy Frequency Estimation Synthetic Algorithm in Laser Doppler Velocity Radar[J]. Journal of Electronics & Information Technology, 2011, 33(7): 1689-1693. doi: 10.3724/SP.J.1146.2010.01373
Citation: Liu Xiu-qing, Yang Ru-liang, Yang Zhen. Unsupervised Classification Methods and Experimental Research of Dual-frequency Fully Polarimetric SAR Images[J]. Journal of Electronics & Information Technology, 2004, 26(11): 1738-1745.

Unsupervised Classification Methods and Experimental Research of Dual-frequency Fully Polarimetric SAR Images

  • Received Date: 2003-06-06
  • Rev Recd Date: 2003-09-11
  • Publish Date: 2004-11-19
  • In this paper, initial assumption of SAR pixel distribution is derived from H/a classifier. Then a Maximum Likelihood (ML) method is introduced to improve the classifi-cation.. The backscattering properties of a natural medium, that varies with the observation frequency, dual-frequency SAR images are combined to get further improved classification. Speckle in SAR images will disturb classification accuracy. Vector filter of speckle is used to dual-frequency images before classification. Experiments are done on data got by NASA/JPL lab near Tien Mountains, and pseudo-colored classification results of both single and dual frequency POLSAR image are submitted. Results show that filtered dual-frequency fully polarimetric SAR data obtain the best classification result.
  • Cloude S R, Pottier E. An entropy based classification scheme for land applications of polarimetric SAR. IEEE Trans. on GRS, 1997, 35(1): 68-78.[2]Cloude S R, Pottier E. A review of target decomposition theorems in radar polarimetry. IEEE Trans. on GRS, 1996, 34(2): 498-518.[3]Lee J S, Grunes M R, Ainsworth T L. Unsupervised classification using polarimetric decomposition and the complex Wishart classifer. IEEE Trans. on GRS, 1999, 37(5): 2249-2258.[4]Lee J S, Grunes M R. Classification of multi-look polarimetric SAR imagery based on complex Wishart distribution[J].Int. J. Remote Sensing.1994, 15(11):2299-2311[5]Famil L F, Pottier E, Lee J S. Unsupervised classification of multifrequency and fully polarimetric SAR images based on the H/A/Alpha-Wishart classifier. IEEE Trans. on GRS, 2001, 39(11):2332-2341.[6]Lee J S, Grunes M R, Grandi G D. Polarimetric SAR speckle filtering and its implication for classification. IEEE Trans. on GRS, 1999, 37(5): 2363-2373.[7]Lee J S, Grunes M R, Mango S A. Speckle reduction in multipolarization, multifrequency SAR imagery. IEEE Trans. on GRS, 1991, 29(4): 535-544.[8]刘秀清,杨震,杨汝良.全极化合成孔径雷达图像极化白化滤波参数估计方法的改进研究.电子学报,2003,31(12):1795-1799.
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