| 一种改进的多基线相位展开方法 |
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| 引用本文： | 谢家朝,谢先明,许华夏,王健,曾庆宁.一种改进的多基线相位展开方法[J].测绘科学,2018(1):117-123. |
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| 作者姓名： | 谢家朝 谢先明 许华夏 王健 曾庆宁 |
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| 作者单位： | 桂林电子科技大学信息与通信学院,广西桂林,541004 |
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| 基金项目： | 国家自然科学基金项目，广西自然科学基金项目，广西无线宽带通信与信号处理重点实验室2014/2015年主任基金项目，认知无线电教育部重点实验室主任基金 |
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| 摘 要： | 针对最大似然估计的多基线InSAR相位解缠算法对噪声比较敏感且难以解缠低信噪比干涉图的缺点,该文提出一种多基线迭代与最大似然估计相结合的多基线相位展开方法。首先利用多基线迭代法得到最长基线干涉图粗略的干涉相位;然后在以此粗略相位为中心的相位区间里,利用多基线最大似然估计得到最长基线干涉图的干涉相位精确估计值。该文采用仿真的金字塔场景、多山场景以及城市场景干涉图进行相位解缠实验。实验表明,该方法的相位展开精度比多基线迭代法和最大似然估计法都有了不同程度的提高。
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| 关 键 词： | 干涉合成孔径雷达 多基线相位解缠 多基线迭代 最大似然估计 无味卡尔曼滤波 InSAR multi-baseline phase unwrapping multi-baseline iterative maximum likelihood estimation unscented Kalman filter |
Animproved multi-baseline phase unwrapping method |
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| XIE Jiachao,XIE Xianming,XU Huaxia,WANG Jian,ZENG Qingning.Animproved multi-baseline phase unwrapping method[J].Science of Surveying and Mapping,2018(1):117-123. |
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| Authors: | XIE Jiachao XIE Xianming XU Huaxia WANG Jian ZENG Qingning |
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| Abstract: | Aiming at the shortcoming that multi-baseline InSAR phase unwrapping algorithm based on traditional maximum likelihood estimation method is sensitive to noise and difficult to unwrap the low signal-to-noise ratio interferograms,a multi-baseline phase unwrapping method which combined multi-baseline iterative method and maximum likelihood estimation was proposed.Firstly,the interference phase of the longest baseline interferogram is obtained by using the multi-baseline iterative method.Then,in the rough phase range,the multi-baseline maximum likelihood estimation method is used to estimate the accurate interference phase of the longest baseline interference figure.This paper uses the simulation pyramid scene,the mountainous scene and the urban scene interference graph to carry on the phase unwrapping experiment.Experiments show that the phase unwrapping accuracy of the proposed method is higher than the multi-baseline iterative method and the maximum likelihood estimation method. |
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