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相位解缠是利用干涉合成孔径雷达(InSAR)进行地形高度反演的关键技术之一.由于实际地形复杂多变,使得精确解缠相位成为一个难题.文中给出两种变相位技术及实现方法.第一种技术利用缠绕相位本身的特点,通过构造辅助相位图,将整个相位域分割成若干4-连通域,利用局部缠绕相位梯度方差来避免错误的发生,再利用消去边界算法将这些连通域拼接起来,使得它们之间的相位跳变尽可能少,从而恢复连续的解缠相位;第二种技术通过构造参考面,改变与真实地形对应的缠绕相位,从而降低相位解缠的难度.将两种变相位技术结合起来提出一种相位解缠的方法.并利用由美国TOPSAR获取的干涉数据进行实验,分别验证了两种变相位技术的有效性,以及相位解缠方法的精确性和稳健性.
Phase unwrapping is one of the key techniques for inversion of terrain height using InSAR, which makes it difficult to accurately unwrap the phase due to the complexity and variety of the actual terrain. Two phase-changing techniques and their implementation are given The first technique exploits the characteristics of the wound phase itself and constructs the auxiliary phase map, splits the entire phase domain into several 4-connected domains, and uses the local winding phase gradient variance to avoid errors and then uses the elimination boundary algorithm to connect these Domain splicing, so that the phase transition between them as little as possible to restore continuous unwrapping phase; the second technology by constructing the reference surface, change the winding phase corresponding to the real terrain, thereby reducing the phase unwrapping difficulty. Combining the two phase-changing techniques, a phase unwrapping method is proposed, and the experiments using the interference data acquired by TOPSAR in the USA verify the validity of the two phase-changing techniques and the accuracy of the phase unwrapping method respectively Robustness.