CORRECTION OF STRATIFIED ATMOSPHERE DELAY
INSAR INTERFEROMETRY
1）College of Resource Environment and Tourism，Capital Normal University，Beijing 100048
2）Institute of Mountain Hazards and Environment，CAS，Chengdu 610041
Abstract Atmospheric delay is one of the main limiting factors for extracting groundsurface deformation with small rate over a large area with Interferometric Synthetic Aperture Radar（InSAR）technology.The delay consists of two components：the stratified component and the turbulent component.Stratified atmosphere delay can be plagued by both orbital error and deformation signal.It is difficult to separate this component by traditional interference methods.The residual error of stratified atmosphere delay sometimes could reach the range of deformation in some regions，which seriously impacts the accuracy of SAR interferometry measurement.A multiscale decomposition technique is proposed to evaluate stratified atmosphere delay，based on recognition of atmospheric components using North America NARR model.The results demonstrate that the method can effectively reduce the stratified components in InSAR interferometric phase.
