摘要
地基干涉合成孔径雷达是边坡高精度形变测量的重要手段,而相位解缠的准确性直接影响到形变测量的可靠性.为解决随机跳变噪声造成的累积相位阶跃型误差,提出了三维空时相位解缠方法.结合差分干涉相位模型,基于空间维最小费用流解缠结果识别相位跳变点,构建修正网络,根据跳变点和局域内非跳变点之间的空间约束关系建立空域约束方程,根据相邻干涉图的时序约束关系建立时域约束方程,联立实现二维解缠结果的修正.仿真和实测数据的处理结果表明,该方法可以有效地修正随机跳变噪声带来的解缠误差,进而修正区域型相位解缠误差,提高形变反演的可靠性.
GB-InSAR(ground-based interferometric synthetic aperture radar)plays an important role in high pre-cision deformation measurement.The deformation measurement reliability is affected significantly by phase un-wrapping accuracy.In order to solve the cumulative phase jump error caused by random jump-noise,a 3-D spa-tial-temporal phase unwrapping method was proposed.Firstly,the phase jump pixels were arranged to be identi-fied based on the unwrapped phase obtained by spatial minimum cost flow,combining the difference interfer-ence phase model to construct a correction network.And then,based on the established spatial constraint equa-tion between the jump pixel and its neighborhood pixels,together with the temporal constraint equation between two successively interferograms to correct the 2-D unwrapped phase.Finally,simulation and measurement tests were carried out.The results of simulation and data show that the proposed method can effectively correct un-wrapping errors distributed in sporadic pixels,further more correct regional phase unwrapping errors,improving the deformation inversion reliability.
作者
田卫明
侯思灿
邓云开
周涵璞
王健
王长军
TIAN Weiming;HOU Sican;DENG Yunkai;ZHOU Hanpu;WANG Jian;WANG Changjun(Radar Research Lab,School of Information and Electronics,Beijing Institute of Technology,Beijing 100081,China;Beijing Building Research Institute Co.,Ltd.of CSCEC,Beijing 100076,China;Beijing Key Laboratory of Embedded Real-time Information Processing Technology,Beijing 100081,China;Chongqing Innovation Center Beijing Institute of Technology,Chongqing 401120,China;Advanced Technology Research Institute,Beijing Institute of Technology,Jinan,Shandong 250300,China)
出处
《北京理工大学学报》
EI
CAS
CSCD
北大核心
2023年第11期1146-1153,共8页
Transactions of Beijing Institute of Technology
基金
国家重点研发计划项目(2021YFC3001903)
中建股份科技研发课题(CSCEC-2022-Z-4)
国家自然科学基金资助项目(62101036,61971037)
北京理工大学青年教师学术启动计划。
关键词
地基干涉合成孔径雷达
空时相位解缠
最小费用流
随机跳变噪声
ground-based interferometric synthetic aperture radar
space-temporal phase unwrapping
minim-um cost flow
random jump phase error
