Science Service System
You are here : Home : Proposals_Summary

Summary of Proposal LAN0284

TitleHazard Deformation Monitoring using D-INSAR and TerraSAR-X Data
Investigator Kaufmann, Hermann - GeoForschungsZentrum Potsdam, Geodesy and Remote Sensing
Team Member
Xiaofang, Guo - Aero Geophysical Survey & Remote Sensing, Ministry of Land & recource
Xiufeng, He - Hehai University,
SummaryMotives: Investigation of a new differential INSAR method using reflector corners in decorrelated areas where the conventional INSAR will be unavailable and to apply the new method for monitoring the geological hazard phenomena in the Yangtze River Three Gorges area and several coast cities in China. Research on the synergistic use of SAR and GPS to correct the atmospheric influence for the land subsidence and glacier moving monitoring. The applications of the differential interferometric SAR are strongly limited by low coherence over long time intervals due to temporal and geometric decorrelation. To overcome the D-INSAR's shortcomings, the use of the sparsely distributed, but phase stable point targets may be a considerable and significant method. In fact, there are typically two types of point targets: natural one and man made one. The natural permanent scatterers technique can allow one to yield the interferometric phase information of some separate points within SAR images, but only in urban or some special rocky areas. In vegetated areas the density of stable nature permanent scatterers is usually very low, sometimes even nothing at all. In this project we will use a new method of differential SAR interferometry using man-made targets. The most frequently used artificial point targets are corner reflectors. By far the most popular reflector is the triangular trihedral design. Due to stable amplitude and phase performances of the reflectors, the interferometric phase difference of corners can be used to monitor or measure the small and slowly going surface deformation for the cases of large geometrical baseline and large time interval between acquisitions. Furthermore, the position and height for each corner reflector can be accurately measured by means of GPS that extremely reduce the errors related to inaccurate height determination and differential process.

Back to list of proposals

DLR 2004-2016