Underground coal mining inevitably results in land surface *** information on land surface subsidence is important in the detection of surface ***,conventional data acquisition techniques cannot always retrieve inform...
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Underground coal mining inevitably results in land surface *** information on land surface subsidence is important in the detection of surface ***,conventional data acquisition techniques cannot always retrieve information on whole subsidence *** study focuses on the reconstruction of a digital elevation model（DEM） with terrestrial laser scanning（TLS） point cloud ***,the methodology of the DEM with terrestrial 3-dimensional laser scanning is ***,a DEM modeling approach that involves the application of curved non-uniform rational B-splines（NURBS） surface is put ***,the performance of the DEM modeling approach with different surface inverse methods is *** results indicate that the DEM based on the point cloud data and curved NURBS surface can achieve satisfactory *** addition,the performance of the hyperbolic paraboloid appears to be better than that of the elliptic *** reconstructed DEM is continuous and can easily be integrated into other *** features are of great importance in monitoring dynamic ground surface subsidence.
An altemative algorithm for mitigating GPS multipath was presented by integrating unscented Kalman filter （UKF） and wavelet transform with particle filter. Within consideration of particle degeneracy, UKF was taken ...
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An altemative algorithm for mitigating GPS multipath was presented by integrating unscented Kalman filter （UKF） and wavelet transform with particle filter. Within consideration of particle degeneracy, UKF was taken for drawing particle. To remove the noise from raw data and data processing error, adaptive wavelet filtering with threshold was adopted while data preprocessing and drawing particle. Three algorithms, named EKF-PF, UKF-PF and WM-UKF-PF, were performed for comparison. The proposed WM-UKF-PF algorithm gives better error minimization, and significantly improves performance of multipath mitigation in terms of SNR and coefficient even though it has computation complexity. It is of significance for high-accuracy positioning and non-stationary deformation analysis.
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