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)

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