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首页> 外文期刊>IEEE Transactions on Geoscience and Remote Sensing >Four-Dimensional SAR Imaging for Height Estimation and Monitoring of Single and Double Scatterers
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Four-Dimensional SAR Imaging for Height Estimation and Monitoring of Single and Double Scatterers

机译：用于单散射和双散射体高度估计和监视的四维SAR成像

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摘要

The superposition of contributions from different stable targets within the same pixel is a phenomenon that may impair the imaging and monitoring of ground scatterers via the multipass synthetic aperture radar (SAR) interferometry technique. Three-dimensional SAR imaging, also known as SAR tomography, uses multiple views to profile the scattering power at different heights. This technique has been shown to be capable of separating interfering target responses on real data. Differential SAR tomography has been recently proposed as a technique that extends the potentialities of SAR tomography to the target deformation monitoring. It performs a 4-D space–velocity imaging that enables not only separating interfering targets in elevation but also distinguishing their single slow deformation velocities. This work addresses for the first time the application of 4-D SAR imaging to real data to determine the height and mean deformation velocity of single scatterers and double-scattering mechanisms interfering at high resolution in the same pixel. It also discusses the postprocessing steps required to identify the presence of stable single and double scatterers after elevation–velocity focusing. Moreover, it proposes a technique for the extraction of time series from interfering targets to measure possible nonlinear temporal deformations.
机译：来自同一像素内不同稳定目标的贡献的叠加是一种现象，可能会通过多通道合成孔径雷达（SAR）干涉测量技术损害地面散射体的成像和监视。三维SAR成像（也称为SAR层析成像）使用多个视图来描绘不同高度的散射功率。事实证明，该技术能够分离真实数据上的干扰目标响应。近年来，已提出差分SAR层析成像技术，该技术将SAR层析成像的潜力扩展到目标变形监测。它执行4维空速成像，不仅可以分离高程中的干扰目标，还可以区分它们的单个缓慢变形速度。这项工作首次解决了将4-D SAR成像应用于实际数据，以确定在同一像素中以高分辨率干涉的单个散射体和双重散射机制的高度和平均变形速度的问题。它还讨论了在确定高程速度聚焦之后确定稳定的单散射体和双散射体所需的后处理步骤。此外，它提出了一种从干扰目标中提取时间序列以测量可能的非线性时间变形的技术。

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