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    • 21. 发明申请
    • GPS NAVIGATION USING INTERACTING MULTIPLE MODEL (IMM) ESTIMATOR AND PROBABILISTIC DATA ASSOCIATION FILTER (PDAF)
    • GPS导航使用交互式多模型(IMM)估计器和概率数据协调滤波器(PDAF)
    • US20080246653A1
    • 2008-10-09
    • US11696920
    • 2007-04-05
    • Xiangdong LinGengsheng ZhangMangesh ChansarkarDaniel LiaoLionel Garin
    • Xiangdong LinGengsheng ZhangMangesh ChansarkarDaniel LiaoLionel Garin
    • G01S1/00
    • G01S19/42
    • A method for GPS navigation which uses an interacting multiple-model (IMM) estimator with a probabilistic data association filter (PDAF) improves navigation performance. The method includes (a) providing two or more models of GPS navigation, with each model characterized by a model state vector which is updated periodically, (b) providing for each model a corresponding filter for deriving, for each period, a current value for the corresponding model state vector based on current measurements made on parameters affecting the corresponding state vector; and (c) applying an interacting multiple model (IMM) estimator to provide, for each period, a current value for a system state vector using the current values of the model state vectors for that period and their corresponding filters. Each model state vector may include one or more of the following: variables: 3-dimensional position, 3-dimensional velocity, satellite clock bias, satellite clock drifts and one or more other satellite parameters. The current value of the system state vector may be a weighted average of the current values of the model state vectors, where the weights are a set of mode probabilities. In addition, one or more of the filters is a probabilitic data association filter (PDAF).
    • 使用具有概率数据关联过滤器(PDAF)的交互式多模型(IMM)估计器的GPS导航方法提高了导航性能。 该方法包括(a)提供两个或多个GPS导航模型,每个模型的特征在于周期性更新的模型状态向量,(b)为每个模型提供相应的滤波器,以便为每个周期导出当前值, 基于对影响对应状态向量的参数进行的当前测量的相应模型状态向量; 并且(c)应用交互式多模型(IMM)估计器,以使用该周期的模型状态向量的当前值及其对应的过滤器为每个周期提供系统状态向量的当前值。 每个模型状态向量可以包括以下中的一个或多个:变量:3维位置,3维速度,卫星时钟偏差,卫星时钟漂移和一个或多个其他卫星参数。 系统状态向量的当前值可以是模型状态向量的当前值的加权平均值,其中权重是一组模式概率。 另外,一个或多个过滤器是概率数据关联过滤器(PDAF)。
    • 22. 发明申请
    • Aiding in a satellite positioning system
    • 协助卫星定位系统
    • US20060095206A1
    • 2006-05-04
    • US10515808
    • 2003-05-22
    • Lionel GarinLeon PengGengsheng ZhangNicolas Vantalon
    • Lionel GarinLeon PengGengsheng ZhangNicolas Vantalon
    • G01C21/36
    • G01S19/256G01S19/235G01S19/254
    • The invention relates to an aided Global Positioning System (GPS) subsystem within a wireless device. The wireless device includes a wireless processing section capable of receiving signals from a wireless network and a GPS subsystem having a radio frequency (RF) front-end capable of receiving a GPS satellite signal. The wireless processing section of the wireless device receives an external clock and determines the offset between the clock in the wireless processing section and that of the external clock. The GPS subsystem then receives the offset information from the wireless processing section, information related to the nominal frequency of the wireless processing section clock and the wireless processing section clock. Using this information and the GPS clock in the GPS subsystem, the GPS subsystem determines an acquiring signal, which is related to a frequency offset between the GPS clock and the network clock. The GPS subsystem then acquires GPS satellite signals in an acquiring unit though the use of the acquiring signal.
    • 本发明涉及无线设备内的辅助全球定位系统(GPS)子系统。 无线设备包括能够从无线网络接收信号的无线处理部分和具有能够接收GPS卫星信号的射频(RF)前端的GPS子系统。 无线装置的无线处理部接收外部时钟并确定无线处理部中的时钟与外部时钟的时钟之间的偏移。 然后,GPS子系统接收来自无线处理部分的偏移信息,与无线处理部分时钟的标称频率和无线处理部分时钟有关的信息。 在GPS子系统中使用该信息和GPS时钟,GPS子系统确定与GPS时钟和网络时钟之间的频率偏移相关的获取信号。 然后,GPS子系统通过使用采集信号在获取单元中获取GPS卫星信号。