Correcting ionospheric effects and monitoring two-dimensional displacement fields with multiple-aperture InSAR technology with application to the Yushu earthquake

• Published in: Science China. Earth sciences 2012-12, Vol.55 (12), p.1961-1971
• Main Authors: Hu, Jun, Li, ZhiWei, Zhang, Lei, Ding, XiaoLi, Zhu, JianJun, Sun, Qian, Ding, Wei
• Format: Article
• Language: English
• Subjects: Displacement; Displacement measurement; Earth and Environmental Science; Earth Sciences; Earthquakes; Environmental monitoring; Error analysis; Interferometric synthetic aperture radar; Interferometry; Ionosphere; Ionospherics; Monitoring; Research Paper; Seismic activity; Seismic phenomena; Seismology; Two dimensional; 二维; 位移场; 地震; 多孔径; 差分合成孔径雷达干涉测量; 玉树; 电离层效应; 雷达技术
• ISSN: 1674-7313; 1869-1897
• DOI: 10.1007/s11430-012-4509-x

Differential synthetic aperture radar interferometry （D-InSAR） can only measure one-dimensional surface displacements along the line-of-sight （LOS） direction which greatly inhibits its development and application.In this paper, we introduce a novel approach to measuring two-dimensional （2-D） surface displacements by exploiting a single InSAR pair, which is called multi-aperture InSAR （MAI） technology.We study the effects of baseline errors and the ionosphere on MAI technology and develop a directional filter and interpolator to minimize the ionospheric effects.A PALSAR image pair covering the 2010 Yushu earthquake is used to estimate the 2-D displacement fields of the earthquake using the MAI approach.The experimental results show that MAI is superior to conventional Offset-Tracking and therefore has great potential in co-seismic displacement measurement and source parameter inversion.