Utilization of WRF 3D Meteorological Data to Calculate Slant Total Delay for InSAR Atmospheric Correction

Abstract The atmosphere introduces excess delays into the synthetic aperture radar (SAR) signal trajectory, especially in troposphere. InSAR atmospheric correction methods include use of SAR data and external water vapor products. latter is more effective. However, since removal effects should delay products direction line sight (LOS), it necessary to convert zenith total slant LOS direction. Conventionally, divided by cosine average incident angles obtain phase delays. But this method could cause large errors because ignores horizontal gradient change small-scale vertical structure. These problems can be solved using three-dimensional simulated numerical models, case intense weather changes or complex terrain. few scholars paid attention application correction, computation complexity low efficiency. As requirement for higher accuracy introduction caused increasing incidence angles, significantly imperative make utmost method. Weather Research Forecast (WRF) model provide precipitate (PWV) refraction index at different levels three dimensions, then obtained removing effect on process. results demonstrate that 3D accurate improve surface deformation from technology.