A new phase unwrapping algorithm based on partitioning the regions of dense residuals is proposed to unwrap the interferometric phase fast and robustly. In the algorithm, the residuals are obtained at first. Then, an improved residual-pairing method for positive and negative residuals is utilized for setting the branch according to the given rules. Furthermore, the dense residuals regions are divided according to the branches and coherent coefficients. While unwrapping the phase, the regions with high quality are unwrapped at the beginning, then the points in the high noisy regions but not in the branch are unwrapped, finally the points in the branch and unwrapped unsuccessfully are unwrapped. The processing results of simulated data and real data indicate, this algorithm can acquire more accurate and much faster unwrapped phase than the several traditional path following algorithms.%为快速稳定地展开干涉相位,提出基于密集残差点划分的快速相位展开算法.算法首先快速获取残差点,进而利用本文给定的准则进行正负残差点配对设置枝切线；根据枝切线及相干系数将残差点密集区域分离出来；相位展开时首先展开高质量区域,进而展开噪声区中非枝切线上的相位,最后展开枝切线上及没有成功展开的相位.仿真数据和实测数据的处理结果表明,本文算法较传统路径跟踪算法在提高了展开精度的同时还大大提高了处理速度.
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