A new approach to accurately estimate deformation in PS-DInSAR: solution-space search

Bi-dimensional period-diagram methodology proposed by Ferretti in radar interferometry based on permanent scatterers (PS-InSAR) for estimating the deformation from neighboring differential phases (NDP) are affected by the distribution uniformity of normal baseline and temporal baselines and the quantity of interferograms. To overcome the shortage of Bi-dimensional period-diagram methodology, a new method, called solution-space search (SSS) method is proposed in this paper to estimate the parameters of PSs' NDP model. The experiment to detect ground subsidence over Lujiazui in Shanghai during 1992-2002 and the comparison with bi-dimensional period-diagram are performed. The result shows that the SSS method can be used to effectively and reliably estimate the deformations without considering the distribution uniformity of normal baseline and temporal baseline and the quantity of interferograms. Furthermore, more accurate estimations are achieved with SSS method.