The MHM method for weakening the BDS monitoring multipath effect of the large sluice
The multi-path effect existing in the complex environment of large-scale sluice deformation monitoring limits the accuracy of the Global Navigation Satellite System(GNSS)precision positioning.In this regard,this paper proposes a Multipath Hemispherical Map(MHM)method that takes into account the multipath effects of different constellation types of BeiDou Navigation Satellite System(BDS).This method establishes a half-celestial sphere with a monitoring station as the center for grid point division,and realizes multi-path error modeling through parameterization of grid points.Using the monitoring case of the large-scale sluice in the Cao'e River to analyze the single-difference residuals and deformation monitoring coordinate sequences before and after the multi-path correction,the XYZ direction accuracy is improved more than 63.06％,54.17％,and 57.84％after the path error correction,indicating that this method can effectively weaken the multipath effect and improve the deformation monitoring accuracy.
monitoring of deformationBDSmultipath effectgrid modelhemispherelarge sluice
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