Evaluation and Correction of Elevation Angle Influence for Coastal GNSS-R Ocean Altimetry

The elevation angle influence on coastal GNSS-R ocean code-based altimetry for GPS signals (L1 C/A and L5) BDS B1 is investigated, the corresponding correction method presented. study first focuses method, including general experiment geometry code delay estimation using single-point tracking algorithm. peak power maximum derivative are used as location of specular point. Then, sensitivity height retrieved above to analyzed based Z-V model. It can be seen that has a significant retrieval, which will affect precision altimetry. Finally, two methods, model-driven data-driven proposed. experiments demonstrate methods correct influence, more effective. experimental results show that, after correcting L1 signal, L5 signal up meter level, decimeter level (less than 4 decimeters), with respect reference tide gauge (TG) data set, respectively, without smoothing over time. These provide information guide sea surface retrieval GNSS-R, especially multi-satellite observation GNSS higher chipping rate.