SAR Interferometry Infrastructure Deformation Monitoring by the Number of Redundant Observations Optimizes Phase Unwrapping Networks

This work employs synthetic aperture radar interferometry technology to investigate infrastructure deformation in which discontinuous and irregular interferometric fringes make phase unwrapping (PhU) challenging. This study aimed to improve the reliability and practicability of PhU through the number of redundant observations to optimize PhU networks. The proposed PhU networks optimization strategy can improve the efficiency of PhU and accuracy. In addition, we evaluated the reliability of selected networks based on two popular methods. Finally, we used the Edgelist PhU method to demonstrate the reliability of optimized networks. Experiments were carried out on the Nanjing Dashengguan Yangtze River high-speed railway bridge, China, and on buildings deformation in Xi'an, China, the results of which indicate that the proposed method can effectively balance the accuracy and efficiency of PhU.