摘要
大气扰动是地基干涉合成孔径雷达(GB-InSAR,Ground-Based Interferometric Synthetic Aperture Radar)测量的主要误差源之一。在复杂大气条件下,常规的大气相位补偿方法不再适用,本文提出了一种基于PS(Permanent Scatterer,永久散射体)技术的改进方法。该方法首先通过Delaunay三角网建立临近PS对,分析各临近PS对的差分相位序列标准差,实现PS集合中的噪声点或部分形变点的滤除;然后根据气象数据估计出参考大气相位序列,通过计算剩余PS的干涉相位序列与参考大气相位序列的MIC(Maximal Information Coefficient,最大互信息系数),结合空间维相干系数,采用双阈值实现稳定PS的选择;最后采用Kriging插值拟合方法,实现复杂大气条件下的大气相位估计。采用本文所提方法,对九道拐区域实测数据进行了处理,相比于常规方法,有效降低了大气相位补偿误差,保证了GB-InSAR的形变测量精度。
Atmospheric disturbance is one of the main error sources in ground-based interferometric synthetic aperture ra⁃dar(GB-InSAR)measurements.Under complex atmospheric conditions,conventional atmospheric phase compensation methods are no longer applicable.This paper proposes an improved method based on PS(Permanent Scatterer)technol⁃ogy.Firstly,the method establishes adjacent PS pairs through the Delaunay triangulation network,and analyzes the stan⁃dard deviation of the differential phase sequence of each adjacent PS pair.Those noisy points or partial deformation points in the PS set can be filtered out.Then,the reference atmospheric phase sequence is estimated based on the meteorological data.By calculating the MIC(Maximal Information Coefficient)of the interference phase sequence of the remaining PS and the reference atmospheric phase sequence,together with the spatial coherence,dual thresholds are used to achieve the stable PS selection.Finally,the Kriging interpolation fitting method is used to achieve atmospheric phase estimation under complex atmospheric conditions.The method proposed in this paper is used to process the measured data in the Jiud⁃aoguai area.Compared with the conventional methods,the atmospheric phase compensation error is effectively reduced,and the deformation measurement accuracy of GB-InSAR can be better guaranteed.
作者
金重阳
刘毓
邓云开
田卫明
胡政权
JIN Chongyang;LIU Yu;DENG Yunkai;TIAN Weiming;HU Zhengquan(School of Electronic and Information Engineering,Chongqing Three Gorges University,Chongqing 404130,China;School of Information and Electronics,Beijing Institute of Technology,Beijing 100081,China;Beijing Institute of Technology Chongqing Innovation Center,Chongqing 401120,China)
出处
《信号处理》
CSCD
北大核心
2022年第11期2432-2442,共11页
Journal of Signal Processing
基金
国家重点研发计划子课题(2021YFB3901405)
国家自然科学基金(62101036)
重庆市自然科学基金(cstc2019jcyjmsxm1328)
重庆市教育委员会科学技术研究计划青年项目资助项目(KJQN202101226)
三峡库区地质环境监测与灾害预警重庆市重点实验室开放基金项目(ZD2020A0101)。
关键词
地基干涉合成孔径雷达
最大互信息系数
空间维相干系数
稳定PS
KRIGING插值
ground-based interferometric synthetic aperture radar
maximal information coefficient
spatial coherence
stable permanent scatterer
Kriging interpolation
