A fast phase unwrapping algorithm for SAR interferometry
A fast phase unwrapping algorithm for SAR interferometry
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DOI：
10.1109/36.739085
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
M. Costantini;A. Farina;F. Zirilli
中科院分区：
文献类型：
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作者：
M. Costantini;A. Farina;F. Zirilli
相位解缠是干涉合成孔径雷达(SAR)系统数据生成场景高程图的关键问题。相位展开是指将两个合成孔径雷达系统接收到的辐射的相位差重建为方位角和斜距坐标的函数。可用于重建相位差的数据是差模2/SP1 pi/的量度。提出了一种利用离散空间中梯度矢量场的无旋性质的等价性进行相位展开的方法。该性质首先被用来定位从可用数据估计的离散向量场必须被校正的区域，然后，在一些先验信息的知识下，执行所需的校正，以获得相位差函数的离散梯度的有用估计，从该估计重构相位差函数。快速傅立叶变换的使用使快速算法成为可能，即在O(NlogN)个基本运算中处理N个像素的图像。给出了该方法在真实数据和模拟数据上的测试结果。
Phase unwrapping is the key problem in building the elevation map of a scene from interferometric synthetic aperture radar (SAR) system data. Phase unwrapping consists in the reconstruction of the phase difference of the radiation received by two SAR systems as a function of the azimuth and slant range coordinates. The data available to reconstruct the phase difference are a measure of the difference module 2/spl pi/. The authors propose a phase unwrapping method that makes use of the equivalent, in a discrete space, of the irrotational property of a gradient vector field. This property is used first to locate the areas where the discrete vector field estimated from the available data must be corrected, and then, with the knowledge of some a priori information, to perform the correction needed to obtain a useful estimate of the discrete gradient of the phase difference function, from which the phase difference function is reconstructed. The use of the fast Fourier transform makes it possible to have a fast algorithm, that is to process an image of N pixel in O(NlogN) elementary operations. Tests of the method proposed here on real and simulated data are presented.