摘要
Abstract
This study aims to evaluate the accuracy of water level inversion based on global navigation satellite system reflection(GNSS-R)technology.Nonlinear fitting and spectral analysis methods were used,and the advantages and disadvantages of these two methods in water level inversion were compared.Through systematic analysis and comparison of the accuracy and applicability of these two methods,it is found that water level changes at different stations exhibit significant seasonal characteristics,especially with peak water levels during the summer and relatively lower levels at the beginning and end of the year.This is closely related to hydrometeorological factors such as precipitation and runoff.In terms of accuracy,the nonlinear fitting method demonstrates reduced root mean square error and the mean absolute error compared to the spectral analysis method,along with a slight advantage in correlation.The results indicate that the nonlinear fitting method demonstrates higher accuracy and consistency in error control,data adaptability,and capturing water level trends,providing more reliable technical support.关键词
全球导航卫星系统反射信号(GNSS-R)/水位高度/非线性拟合方法/频谱分析方法/验潮站Key words
global navigation satellite system reflection(GNSS-R)/water level height/nonlinear fitting method/spectral analysis method/tide gauge station分类
天文与地球科学
