共查询到18条相似文献,搜索用时 125 毫秒
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何文彦雷正伟甄红涛李凯丽刘雅迪 《价值工程》2023,(2):59-61
为了更好地实现时间同步和提高守时设备精度,提出了一种基于FPGA硬件平台的北斗守时设备铷钟驯服技术。采用时间间隔测量原理计算铷钟的钟差值,采用vondrak滤波和kalman滤波相结合方法对钟差值进行滤波,然后利用PID控制算法对铷钟电压进行控制,从而实现铷钟驯服。测试结果表明,滤波算法对钟差值有显著滤波效果,对实现时间同步和提高守时精度起到了关键作用。 相似文献
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通过巧妙的使用适当的算法,充分利用PLC硬件性能,在设备监控系统允许的条件下,完成温度数值跳变滤波算法应用,既节约了硬件资源,更重要的是解决了现场监控难题,提高了设备运行稳定性。 相似文献
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由于描述系统特性的数学模型和噪声的统计模型不准确,不能真实反映物理过程,使模型与获得的观测值不匹配从而会导致滤波器发散。文章在描述组合导航基本特性和卡尔曼滤波原理的基础上提出了滤波发散的问题并提出了抑制发散的方法,最后介绍了卡尔曼滤波在组合导航中的应用。 相似文献
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本文简要介绍了Contourlet理论,基于NSCT的Wiener滤波去噪算法,无论是直观去看还是从PSNR来评定,均证明了该方法的有效性。 相似文献
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Hermann Singer 《Statistica Neerlandica》2008,62(1):29-57
Stochastic differential equations (SDE) are used as dynamical models for cross-sectional discrete time measurements (panel data). Thus causal effects are formulated on a fundamental infinitesimal time scale. Cumulated causal effects over the measurement interval can be expressed in terms of fundamental effects which are independent of the chosen sampling intervals (e.g. weekly, monthly, annually). The nonlinear continuous–discrete filter is the key tool in deriving a recursive sequence of time and measurement updates. Several approximation methods including the extended Kalman filter (EKF), higher order nonlinear filters (HNF), the local linearization filter (LLF), the unscented Kalman filter (UKF), the Gauss–Hermite filter (GHF) and generalizations (GGHF), as well as simulated filters (functional integral filter FIF) are compared. 相似文献
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Sequential Data Assimilation Techniques in Oceanography 总被引:8,自引:0,他引:8
Laurent Bertino Geir Evensen Hans Wackernagel 《Revue internationale de statistique》2003,71(2):223-241
We review recent developments of sequential data assimilation techniques used in oceanography to integrate spatio-temporal observations into numerical models describing physical and ecological dynamics. Theoretical aspects from the simple case of linear dynamics to the general case of nonlinear dynamics are described from a geostatistical point-of-view. Current methods derived from the Kalman filter are presented from the least complex to the most general and perspectives for nonlinear estimation by sequential importance resampling filters are discussed. Furthermore an extension of the ensemble Kalman filter to transformed Gaussian variables is presented and illustrated using a simplified ecological model. The described methods are designed for predicting over geographical regions using a high spatial resolution under the practical constraint of keeping computing time sufficiently low to obtain the prediction before the fact. Therefore the paper focuses on widely used and computationally efficient methods. 相似文献
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卡尔曼滤波及其改进方法在行驶车辆状态估计中有着广泛的应用,并取得良好的效果;本文针对自适应卡尔曼滤波算法、无轨迹卡尔曼滤波算法的应用等进行了综合性阐述。 相似文献
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多输入多输出(MIMO)技术是LTE系统中的关键技术之一,能够在不增加带宽的情况下成倍地提高了通信系统的容量和频谱利用率。本文提出了一种多用户MIMO下行链路中基于卡尔曼滤波的信道预测算法。在实际传输时,发射端根据接收端反馈回来的信道信息预测出下一时刻的下行信道信息,仿真结果验证了所提方法的有效性。 相似文献
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文章研究了联合计划、预测和补货(CPFR)中的联合预测流程,并建立了相关的预测模型。在建模的过程中,使用了状态空间方程来描述实际市场需求和观测到的市场需求(销售量),并通过卡尔曼滤波来预测零售商下期的销售量.结合零售商库存策略,预测出零售商下期的订单量。 相似文献