The Research Of Multipath Effect Model And Mitigation Method For GNSS Based Sea Dynamic Environment

Among various of errors in GNSS, there are several errors can be eliminated by couble-difference observation or precise model, including satellite clock offset, receiver offset and atmosphere delay error and so on. However, because station correlation is weakly and the influence of surrounding environment is serious, it is impossible eliminated by couble-different observation and there is no precise model. At present it is mainly weakened by the hardware design, reasonable location scheme and signal processing technology.The application of GNSS in marine surveying and mapping is more and more widely. Because of the marine characteristic environment, multipath effect is an important error source and the location precise is influenced seriously. Therefore it is of great significance to build a multipath effect model based on marine environment.The sea environment and influence of sea multipath effect containing reflection coefficient and distance of reflective surfaces to antenna have been detailed analysis and multipath effect model based sea surface environment has been preliminary discussed in this paper. The process of static environment on lake surface and dynamic environment on sea surface have been simulated. The multipath effect models have been derived in both case according to the geometric relations among each parameters. And the multipath effect model on dynamic sea environment has been verified by the simulation data. The result calculated by GAMIT is shown that positioning accuracy can improve about a magnitude.The method of confirming wavelet layers with the correlation of adjacent cycle detail signals has been proposed by cyclical properties in this paper. The result proves that multipath effect can be extracted by the wavelet transform and positioning precision can be increased a certain extent. However, the precision is limited because the author just used the excellent wavelet base from previous, without researching how to choose the wavelet base. The research will focuse on choosing wavelet bases to extract the multipath effect.