能量方程在InSAR相位解缠中的应用研究

Research on Application of Energy Equation in InSAR Phase Unwrapping

将能量方程应用于InSAR二维相位解缠中,阐述了它的基本原理。通过对干涉图进行均值滤波处理,使同一条纹内的相位得到平滑,相邻条纹间的相位得到增强,避免了相位解缠产生的拉线现象。在相位解缠过程中,对每一像素点进行相位梯度估计,减少了误差的传播。该方法有效地解决了原能量方程算法在干涉条纹较多情况下,相位解缠不收敛的问题,提高了相位解缠的精度。仿真数据和真实InSAR数据的实验结果验证了该方法的有效性。

The energy equation was used into InSAR two-dimensional phase unwrapping and its basic theory was analyzed.That the interferogram was treated with mean value wave filtering smoothed the phase in the same stripe,strengthened the phase in the different stripes and,then,avoided the pull-line phenomenon.In the process of the phase unwrapping,the phase gradient at each image element point was estimated and the error propagation was reduced.This method effectively solves the problem that the phase unwrapping is not convergent when the original energy equation is applied in large number of interference fringes,improving the accuracy of the phase unwrapping.The experiment results of simulated and the real InSAR data verified the effectiveness of the algorithm.