A very fast phase inversion approach for small baseline style interferogram stacks

作者：Zhang Kui^*; Li Zhengzhou; Meng Guojie; Dai Yaqiong

来源：ISPRS Journal of Photogrammetry and Remote Sensing, 2014, 97: 1-8.

DOI：10.1016/j.isprsjprs2014.08.002

• Derivative-based optimization
• Weighted least squares
• Phase inversion
• Interferometric time-series analysis
• Interferometric synthetic aperture radar (InSAR)
• Satellite remote sensing

The recently developed interferometric time-series analysis techniques have shown great potential in ground surface deformation monitoring applications. Such techniques overcome the drawbacks of the traditional differential radar interferometry (DInSAR) and can achieve millimeter-level measurement accuracy. One of the most important operations in interferometric time-series analysis techniques - referred to as phase inversion - is to estimate relative deformation velocity and digital elevation model error from a double-differenced interferometric phase time-series. Unfortunately, current phase inversion methods generally exhibit a low computational efficiency due to their high non-linearity, especially in the case when the dimension of an interferogram stack is large. In this paper, a new approach is proposed to efficiently resolve phase inversion problems defined on stacks constructed by interferograms with small baselines. The approach separates an estimation procedure into two parts. First, preliminary estimates are obtained by weighted least squares. Then, the estimates are refined by optimizing the corresponding ensemble phase coherence function. The proposed approach was applied to simulated and real data. Experimental results demonstrate that it can accurately address the phase inversion problem with a very high computational performance.

• 出版日期2014-11
• 单位中国地震局地震预测研究所; 重庆大学