Layered Calculation of Water Level in Zhangjiagang Section of Yangtze River Based on GNSS-R Technology
Aiming at the problems of large error and low temporal resolution of the reflection measurement technology(R)of the global navigation satellite system(GNSS)in the environment of severe nearshore water level change,a layered water level inversion method is proposed,and the inversion results are evaluated by using accuracy factors.We group the signal-to-noise ratio(SNR)data by height angle intervals,and use Lomb-Scargle(LS)spectral analysis to extract the main frequency inversion water level and determine the stratified height.Validated by 35 days of GPS and BDS data in the Zhangjiagang section of the lower Yangtze River,the method significantly improves the accuracy and temporal resolution of the water level inversion,effectively reduces the error and increases the number of inversion results.The results show that the stratified water level inversion method can significantly improve the performance of GNSS reflectometry technology in the water environment with drastic water level changes,and has practical application value.
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