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    • 26. 发明公开
    • Navigation device, route-search server, and route-search system
    • Navigationsvorrichtung,Routensuchserver und Routensuchsystem
    • EP2270432A2
    • 2011-01-05
    • EP10167691.4
    • 2010-06-29
    • Hitachi Ltd.Clarion Co., Ltd.
    • Okude, MarikoFushiki, TakumiMachii, KimiyoshiAmaya, Shinichi
    • G01C21/34
    • G01C21/3415
    • A server device 1 included in the route-search system 7 comprises a guided-navigation-route-search section 130 for searching a route starting from a departure point and reaching a destination; and a preparatory-route-search section 140 for searching a preparatory route in view of a possible deviation of the vehicle from a navigation route. The server device 1 transmits information on the navigation route and the preparatory route to the navigation device 2. When detecting the deviation of the vehicle, the navigation device 2 selects one of preparatory routes having nodes closest to the current position of the vehicle.
      The navigation device 2 searches a supplementary route connecting the current position of the vehicle to the nodes, and combines the preparatory route with the supplementary route to create a new route for continuing navigating the vehicle to the destination.
    • 包括在路径搜索系统7中的服务器装置1包括用于搜索从出发点开始并到达目的地的路线的导航导航路线搜索部130; 以及考虑到车辆与导航路线的可能偏差来搜索预备路线的预备路线搜索部分140。 服务器装置1将导航路径和预备路线的信息发送到导航装置2.当检测到车辆的偏差时,导航装置2选择具有最接近车辆的当前位置的节点的预备路线之一。 导航装置2搜索将车辆的当前位置连接到节点的补充路线,并将预备路线与补充路线组合,以创建用于继续将车辆驶向目的地的新路线。
    • 28. 发明公开
    • Dynamic prediction of traffic congestion by tracing feature-space trajectory of sparse floating-car data
    • 通过监控计算的浮动车数据的空间演变交通拥堵的动态预测
    • EP2040237A2
    • 2009-03-25
    • EP08014634.3
    • 2008-08-18
    • Hitachi, Ltd.
    • Kumagai, MasatoshiHiruta, TomoakiOkude, MarikoTanikoshi, Koichiro
    • G08G1/01
    • G08G1/0141G08G1/0112G08G1/0116G08G1/0129
    • A traffic situation is predicted based on the correlation in the traffic situation between road sections. A base vector generation unit 102 generates the base vectors constituting a feature space representing the correlation between a plurality of links by making a principal component analysis for the necessary time in the past recorded in a necessary time database. A projection point trajectory generation unit 104 records a projection point trajectory of projecting the necessary time in the past recorded in the necessary time database to the feature space in a projection point database 105. A feature space projection unit 103 projects the necessary time at present to the feature space, and a neighboring projection point retrieval unit 106, 801 retrieves a past projection point in the neighborhood of the concerned projection point from the projection point database 105, and a projection point trajectory trace unit 107, 802 traces the trajectory of past projection points starting from the retrieved neighboring projection point for a prediction target time width, and an inverse projection unit 108 inversely projects the end point of the concerned trajectory to calculate the predicted value of the necessary time.
    • 交通状况是基于路段的交通状况的相关性预测。 甲基矢量生成单元102基因率构成表示通过使主成分分析记录在一个必要时间数据库中的过去的必要的时间的链接之间的多个相互关系的特征空间中的基矢量。 一种投影点轨迹生成单元104记录在投射在本记录在必要的时间数据库到特征空间中的投影点数据库105的特征空间投影单元103的项目所必需的时间过去必要的时间的投影点轨迹 特征空间,和相邻投影点检索单元106,801中检索在从投影点数据库105中的关注投影点的附近的过去投影点,和一个投影点轨迹跟踪单元107,过去投影的802轨迹的轨迹 指向从用于预测目标时间宽度所检索的相邻投影点开始,并在逆投影单元108反向突出的关注轨迹来计算的必要的时间的预测值的终点。