一种二维INSAR解相位模糊方法研究

解相位模糊问题是干涉SAR成像处理中最关键的问题之一,它直接影响成像高度的精度。文中结合递推估计方法,给出了一种解相位模糊方法。其过程是根据给定的初始相位数据或邻近的已解模糊的相位值通过递推估计来获取相位估值,再经过可信度的检测来保证相位估值的可靠性。模拟实验后的实验结果表明该方法是有效的,并它成功地恢复了相位所丢失的2nπ分量,其相位值与模拟的真实值比较,相对误差也很小。

A Method of Two-dimensional Phase Unwrapping for Interferometric SAR

Phase unwrapping of the interferometric SAR is a very important step to obtain an accurate DEM (Digital Elevation Model). By using a recurrence estimating method, this paper describes a kind of method for phase unwrapping of INSAR. Starting from given initial phase values or adjacent unwrapped phase, the phase estimation values are sequentially obtained by the recurrence relation. Then by the measure of confidence of the phase estimation valuse, the unwrapping phase values of high reliability can be obtained. By using the approach, the simulating experiment is undertaken. The result shows that the method successfully unwraps the phase and the error caused by the algorithm is also very small.