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An alternative 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. 相似文献
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球冠结构在焊接过程中产生的焊接变形是关系到结构安全性能的重要指标.为了保证球冠焊接构件的可靠性,准确推断球冠结构焊接变形,有必要针对球冠结构的焊接变形进行数值试验分析.基于大型有限元软件ABAQUS开发相应的焊接程序,对焊接过程中温度场、结构变形进行了数值模拟,并将模拟结果与相关理论值及试验值进行对比分析.结果表明,数值试验结果与理论结果基本吻合,满足工程要求.在此基础上,对球冠结构的焊接过程进行三维有限元分析,得到了球冠结构焊接变形随球冠壁厚、焊接坡口形式及焊接顺序的变化规律,为控制结构的焊接变形提供了依据. 相似文献
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分析了铰链式塑料瓶盖的结构特点,使用Moldflow软件对塑件注射成型过程进行了CAE分析.确定了模具的浇注系统及成型工艺。模具采用点浇口、自动脱螺纹结构,模具结构设计合理,生产效率高。 相似文献