DOI number:10.1016/j.rse.2023.113687
Journal:Remote Sensing of Environment
Key Words:Distributed scatterer (DS) interferometry (DSI); Phase linking (PL); Maximum-likelihood estimation (MLE); Homogeneity measure; Regularization; Deformation monitoring
Abstract:The distributed scatterer (DS) interferometry (DSI) technology is a powerful geodetic tool for measuring the deformation over abundant land covers. As a state-of-the-art DSI technology, the SqueeSAR approach considered the statistical behavior of the decorrelated DS and proposed the phase triangulation algorithm (PTA) as the pioneering implementation of the phase linking (PL) theory to estimate the equivalent single-reference (ESR) phases from all interferometric combinations. Subsequently, many advanced estimators of the systematic phase series have been introduced. Interestingly, this paper has demonstrated that the utilization of weakly coherent interferometric pairs is not conducive to the theoretical accuracy improvement of the PL theory in case of the fast decorrelation scenario. Moreover, the reduction of the small baseline scales will worsen the positive definite degree of the time series coherence matrix, which makes the ill-posed solution problem more serious. Therefore, this paper proposes a novel adaptive PL (AdpPL) method integrating the following two innovations for mapping surface deformation: 1) in terms of the interferometric pair selection optimization (IPSO), this paper performs the homogeneity measure-based IPSO (HoMeIPSO) method to remove the lowly coherent candidate subset progressively and select the moderate interferometric pairs adaptively; 2) in terms of the robust parameter estimation, an adaptive regularization (AdpReg) approach suggests selecting an optimal damping factor according to the minimum fitting error of all interferogram observables. Experimental results demonstrate that the proposed method can restore the systematic phase series more clearly and detect the deformation area with spatially highly dynamic characteristics successfully.
Co-author:An Bei
Indexed by:Journal paper
Correspondence Author:Wang Changcheng
Discipline:Engineering
Document Type:J
Volume:293
Page Number:113689
Translation or Not:no
Date of Publication:2023-06-22
Included Journals:SCI
Links to published journals:https://www-sciencedirect-com-s.vpn.whu.edu.cn/science/article/pii/S0034425723002389
Date of Publication:2023-06-22