分布式目标的极化SAR距离模糊计算方法研究

洪文; 杨士林; 李洋; 张晶晶; 郭胜龙

doi:10.11999/JEIT141234

分布式目标的极化SAR距离模糊计算方法研究

doi: 10.11999/JEIT141234

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出版历程
- 收稿日期: 2014-09-23
- 修回日期: 2015-02-13
- 刊出日期: 2015-06-19

Study on Polarimetric SAR Range Ambiguity Computation for Distributed Targets

摘要

摘要: 该文提出了一种运用协方差矩阵计算星载全极化SAR距离模糊的方法。首先分析了极化SAR距离模糊的成因及同极化和交叉极化通道间距离模糊能量的差异。现有的距离模糊计算方法以散射矩阵为主，受相干斑影响，单一像素的散射强度不能表征分布目标的反射率，因而在距离向相邻的像素无法确定其距离模糊比。针对上述问题该文推导了基于分布目标的极化SAR距离模糊的计算方法。结合Radarsat-2实测数据对这种新方法进行了验证。实验表明，运用协方差矩阵能够很好地表征分布式目标，由它计算得出的距离模糊比是平稳、确定的。相比已有算法，所提方法能够有效计算极化SAR分布式目标的距离模糊。
- 合成孔径雷达 /
- 分布目标 /
- 极化SAR /
- 距离模糊
Abstract: A new approach is proposed to compute spaceborne SAR range ambiguity using covariance matrix. The causation of range ambiguity of spaceborne SAR and the ambiguous energy difference between like-polarized channel and cross-polarized channel are analyzed. In current study, it is common to use polarimetric scattering matrix to compute range ambiguity. Because of the speckle, the scattering matrix of a pixel can not describe the distributed targets precisely. Therefore, it is hard to decide the range ambiguity signal ratio of adjacent pixels. In this paper, the formulation of computing range ambiguity is derived for distributed targets first. Second, this new method is tested by using Radarsat-2 data. The results show that covariance matrix can effectively illustrate distributed targets. The results are smooth and confirmed. The new method is rational to compute range ambiguity of distributed targets.
- SAR /
- Distributed targets /
- Polarimetric SAR /
- Range ambiguity

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参考文献(22)

韩晓东, 宋红军, 徐伟. 基于星载SAR实时波束形成的星下点及距离模糊抑制方法[J]. 电子与信息学报, 2013, 35(12): 2821-2828.

Han Xiao-dong, Song Hong-jun, and Xu Wei. Nadir and range ambiguity suppression based on real-time digital beam froming in spaceborne SAR[J]. Journal of Electronics Information Technology, 2013, 35(12): 2821-2828.

Wang Wen-qin. Mitigating range ambiguities in high-PRF SAR with OFDM waveform diversity[J]. IEEE Geoscience and Remote Sensing Letters, 2013, 10(1): 101-105.

Yang Jun, Sun Guang-cai, Wu Yu-feng, et al.. Range ambiguity suppression by azimuth phase coding in multichannel SAR systems[C]. IET International Radar Conference 2013, Xian, China, 2013: 1-5.

Davis Michael S and Cook Daniel A. Quantifying the impact of range and azimuth ambiguities on multichannel SAR and SAS image quality[C]. EUSAR 2014: 10th European Conference on Synthetic Aperture Radar, Berlin, Germany, 2014: 1-4.

Ralph C and Pierluigi M. Range ambiguities for a polarimetric spaceborne SAR[C]. IGARSS 92: Proceedings of the 12th Annual International Geoscience and Remote Sensing Symposium, Houston, TX, US, 1992: 637-639.

李延, 丁泽刚, 郭佳佳. 多极化星载SAR模糊比分析与计算[J]. 航天器工程, 2011, 20(1): 45-49.

Li Yan, Ding Ze-gang, and Guo Jia-jia. Ambiguity analysis and calculation of polarimetric SAR[J]. Spacecraft Engineering, 2011, 20(1): 45-49.

戴博伟, 杨汝良. 多极化星载合成孔径雷达系统新工作方式及模糊分析[J]. 电子与信息学报, 2001, 23(12): 1256-1263.

Dai Bo-wei and Yang Ru-liang. New operation modes and ambiguity analysis for spaceborne polarimetric SAR system [J]. Journal of Electronics Information Technology, 2001, 23(12): 1256-1263.

Foucher S and Lopez-Martinez C. Analysis, evaluation, and comparison of polarimetric SAR speckle filtering techniques [J]. IEEE Transactions on Image Processing, 2014, 23(4): 1751-1764.

Raney R K, Freeman A, and Jordan R L. Improved range ambiguity performance in quad-pol SAR[J]. IEEE Transactions on Geoscience and Remote Sensing, 2012, 50(2): 349-356.

刘军鹰, 蔡竟业, 王文钦. 星载距离向多波束SAR的系统模糊特性[J]. 信息与电子工程, 2012, 10(2): 138-142.

Liu Jun-ying, Cai Jing-ye, and Wang Wen-qin. Ambiguity characteristics of spaceborne range multi-beam SAR systems[J]. Information and Electronic Engineering, 2012, 10(2): 138-142.

席龙梅, 盛磊, 葛家龙. 星载滑动聚束SAR模糊特性分析与仿真[J]. 上海航天, 2011, 28(1): 1-6.

Xi Long-mei, Sheng Lei, and Ge Jia-long. Analysis and simulation of ambiguities on spaceborne sliding spotlight SAR[J]. Aerospace Shanghai, 2011, 28(1): 1-6.

荆麟角. 星载SAR距离模糊分布规律及其改进设计[J]. 电子科学学刊, 1994, 16(5): 490-496.

Jing lin-jiao. Range ambiguity distribution characteristic of spaceborne SAR and its design consideration[J]. Journal of Electronics, 1994, 16(5): 490-496.

陈祺, 黄海风, 余安喜, 等. 一种改善交叉极化距离模糊度的新工作模式[J]. 电波科学学报, 2013, 28(6): 1082-1087.

Chen Qi, Huang Hai-feng, Yu An-xi, et al.. A new working mode to improve the cross-polarization range ambiguity to signal ratio[J]. Chinese Journal of Radio Science, 2013, 28(6): 1082-1087.

Curlander J C and McDonough R N. Synthetic Aperture Radar Systems and Signal Processing[M]. Wiley Series in Remote Sensing, Hoboken, NJ: Wiley, 1991: 303-306.

Lee J S and Pottier E. Polarimetric Radar Imaging from Basic to Application[M]. Boca Raton, FL, Taylor Francis Group, 2009: 74-75.

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