| Citation: | HOU J H，HE K F，GAO F，et al. Shore-based BDS-R sea surface altimetry and weighting method of its observed values[J]. Journal of Beijing University of Aeronautics and Astronautics，2024，50（3）：1015-1026 （in Chinese） doi: 10.13700/j.bh.1001-5965.2022.0360
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With the completion of the global networking of BeiDou-3 satellite navigation system (BDS-3), its reflected signals are more and more widely used in the field of global navigation satellite system-reflectometry (GNSS-R) sea surface altimetry. A dual antenna coastal BDS-reflectometry (BDS-R) sea surface altimetry experiment based on BDS-3 B1C reflected signal code-level delay and the combination method of multi-satellite altimetry observations was carried out in order to investigate the performance of sea surface altimetry based on these two factors. The independently developed GNSS-R altimetry software receiver is used for post-processing of the experimental data, and the experimental results and the sea surface height of the shore-based synchronous observation radar altimeter were compared and analyzed to evaluate the accuracy of BDS-R sea surface altimetry. Additionally, the multi-satellite altimetry readings are combined using a weighted technique based on the signal-to-noise ratio (SNR) of the reflected signal and satellite elevation. The results show that the independently developed GNSS-R software receiver can be used for sea surface altimetry, and it is possible that the precision of BDS-R sea surface measurement based on B1C code can reach decimeter level. According to the result of moving averages with 10 s,the root mean square error (RMSE) and mean absolute error (MAE) of single satellite sea surface altimetry are 0.634 m and 0.507 m respectively, and the RMSE and MAE of the weighted combination of multi-satellite observations are 0.538 m and 0.500 m respectively. The observation accuracy of the latter is obviously better than that of the former, and the maximum and minimum observation accuracy can be improved by 70% and 17% respectively. The weighted model with thorough consideration of satellite elevation angle and reflected signal SNR is superior to other weighted models for the same signal multi-satellite GNSS-R altimetry data weighting method,and its measurement accuracy is improved by 9.4%, 9.5%, 20.5%, 35.2% compared with SNR segment model, sine function model, exponential function model, and equal weight model, respectively.
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