Carrier Phase Continuity Monitoring and Correction in GNSS-R Sea Surface Altimetry Systems

Global navigation satellite system-reflectometry technology uses the carrier phase approach to improve the accuracy of sea surface height (SSH) retrieval accuracy. This research introduces a method that combines continuity detection and adaptively weighted fitting to enhance the accuracy of sea-level monitoring. The implementation of the suggested iteratively reweighted least squares method, incorporating integrated, comprehensive coherence indicator weights, results in a significant 1.59% improvement in the area under the curve performance. The root-mean-square error of the retrieved SSH from the CYGNSS satellite dataset is approximately 5 cm. In addition, a coastal experiment has shown that the suggested method achieves a measurement precision of 1 cm for SSH, with an untracked ratio of 13%.