An Improved Ionospheric Correction Model for Grazing Angle GNSS-R Altimetry
- Resource Type
- Conference
- Authors
- Buendia, Raquel N.; Tabibi, Sajad; Talpe, Matthieu
- Source
- IGARSS 2023 - 2023 IEEE International Geoscience and Remote Sensing Symposium Geoscience and Remote Sensing Symposium, IGARSS 2023 - 2023 IEEE International. :4332-4335 Jul, 2023
- Subject
- Aerospace
Components, Circuits, Devices and Systems
Fields, Waves and Electromagnetics
Geoscience
Signal Processing and Analysis
Sea surface
Java
Smoothing methods
Sea measurements
Small satellites
Extraterrestrial measurements
Delays
GNSS
Reflectometry
GNSS-R
Grazing angle
Carrier phase altimetry
Ionospheric delay
- Language
- ISSN
- 2153-7003
In this work, Spire Global, Inc. carrier phase of GNSS dual-frequency reflected signals under grazing angle (GG-R) are used for sea surface altimetry over the Java Sea, Indonesia. Processing of 714 GG-R coherent profiles from January 2020 to October 2021 is carried out to retrieve the relative surface height from WGS84 applying two methods to remove the ionospheric delay: an ionosphere-free combination and smoothing of the frequency-specific correction based on dual-frequency carrier phase observations. A substantial improvement of ∼ 8 cm is observed in the root mean square error (RMSE) between the GG-R retrievals and the reference surface model using the frequency-specific ionospheric correction method.