Title :
An improved inverse distance weighted interpolation method for InSAR tropospheric delay error corrections
Author :
Luo, Haibin ; He, Xiufeng
Author_Institution :
Sch. of Remote Sensing, Nanjing Univ. of Inf. Sci. & Technol., Nanjing, China
Abstract :
InSAR observation accuracy is greatly affected by the tropospheric delay error. The algorithm using GPS-derived tropospheric delay to correct InSAR tropospheric delay error is an effective method. The GPS-derived tropospheric delays have to be interpolated in order to correct the InSAR result on a pixel-by-pixel basis. For the conventional inverse distance weighted interpolation (IDW), the effect of height on tropospheric delay has not been fully considered. Therefore, an impact factor is designed for the IDW, this is called as improved IDW (IIDW). The experimental results from 22 GPS stations over SCIGN show that, compared with the IDW method, the IIDW method can improve the absolute mean error and standard deviation by 25% and 55%, respectively.
Keywords :
atmospheric electromagnetic wave propagation; geophysical signal processing; radar interferometry; radiowave propagation; remote sensing by radar; synthetic aperture radar; troposphere; GPS derived tropospheric delay; IIDW; InSAR observation accuracy; impact factor; improved IDW; inverse distance weighted interpolation method; tropospheric delay error corrections; Atmospheric measurements; Atmospheric modeling; Delay; Global Positioning System; Helium; Interpolation; Monitoring;
Conference_Titel :
Information Science and Technology (ICIST), 2011 International Conference on
Conference_Location :
Nanjing
Print_ISBN :
978-1-4244-9440-8
DOI :
10.1109/ICIST.2011.5765295