A collocation framework to retrieve tropospheric delays from a combination of GNSS and InSAR
- Journal Article
Rights / licenseCreative Commons Attribution 4.0 International
High spatio-temporal variability of atmospheric water vapor affects microwave signals of Global Navigation Satellite Systems (GNSS) and Interferometric Synthetic Aperture Radar (InSAR). A better knowledge of the distribution of water vapor improves both GNSS- and InSAR-derived data products. In this work, we present a collocation framework to combine and retrieve zenith and (relative) slant tropospheric delays. GNSS and InSAR meteorological products are combined aiming at a better retrieval of the atmospheric water vapor. We investigate the combination approach with synthetic and real data acquired in the Alpine region of Switzerland. Based on a closed-loop validation with simulated delays, a few mm accuracy is achieved for the GNSS-InSAR combination in terms of retrieved ZTDs. Furthermore, when real delays are collocated, the combination results are more congruent with InSAR computed products. This research is a contribution to improve the spatio-temporal mapping of tropospheric delays by combining GNSS-derived and InSAR-derived delays. Show more
Journal / seriesNavigation
Pages / Article No.
SubjectGNSS < Atmospheric Effects; Radar < Alternatives and Backups to GNSS; Troposphere < Atmospheric Effects
Organisational unit03824 - Rothacher, Markus / Rothacher, Markus
08704 - SAR Tomographie und PSI Deformationsb.
168952 - High-Resolution Atmospheric Water Vapor Fields by Spaceborne Geodetic Sensing, Tomographic Fusion, and Atmospheric Modeling (SNF)
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