研究目的
To evaluate the performances of GNSS Reflectometry (GNSS-R) in a complex environment for monitoring river/tide stages and the possibility to use this technique for calibration/validation of altimetry data.
研究成果
The study demonstrates the potential of GNSS-R for monitoring water levels with high geometric and temporal accuracies, showing good agreement with in-situ gauge measurements. GNSS-R can be used for calibration/validation of altimetry data in complex environments.
研究不足
The study is limited by the short observation period (one week) and the complex environment of the Mekong river delta, which may affect the accuracy of GNSS-R measurements. The number of observations for Jason-3 and Sentinel-3A was lower than 15, which is not statistically representative.
1：Experimental Design and Method Selection:
The study used GNSS Reflectometry (GNSS-R) based on the Interference Pattern Technic of the Signal-to-Noise Ratio (SNR) to retrieve water levels. Radar altimetry data from Jason-2, SARAL, Jason-3, and Sentinel-3A missions were used for validation.
2：Sample Selection and Data Sources:
A geodetic GNSS station was installed at the Tran De port, Soc Trang province, Vietnam, over 23-30 August 2016. In-situ tide gauge stations were used as reference.
3：In-situ tide gauge stations were used as reference.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: GNSS GR25 receiver from Leica with a single AR10 antenna.
4：Experimental Procedures and Operational Workflow:
The method involved analyzing SNR data from GNSS signals reflected off the water surface, with elevation angles from 0° to 25° and an azimuth mask from 0° to 140° to remove continental reflections.
5：Data Analysis Methods:
The Least Square Method (LSM) was applied to the raw SNR analysis to derive water levels. Comparisons were made between GNSS-R derived water levels, altimetry data, and in-situ gauge records.
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