In the process of phase unwrapping of InSAR

the error of phase unwrapping can be gained if unwrapping path is on the residual error point. Our objective is limiting the error of phase unwrapping in local region. The coherence map of InSAR is used as reliability map for phase unwrapping and is quantized with given level. The residues of wrapped phase are found and then their reliability is set to the lowest level. Phase unwrapping is carried out after reliability reordering. The algorithm using classification table is adopted instead of the slow classical reliability-guided phase unwrapping algorithm.The experiments were carried out to verify the proposed method. The speed of our method is faster than classical reliability-guided algorithm in the experiments. The phase unwrapping results of InSAR show enhanced accuracy

and the error propagations are effectively controlled. The experimental results prove the proposed method is accurate and applicable for InSAR's phase unwrapping.