利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

116 条记录 (耗时 0.022 秒)

    ESTIMATING A TIME OFFSET BETWEEN STATIONARY CLOCKS
    1.
    发明申请
    ESTIMATING A TIME OFFSET BETWEEN STATIONARY CLOCKS 有权
    估计静态时钟之间的时间偏差

    公开(公告)号：US20100138187A1

    公开(公告)日：2010-06-03

    申请号：US12698641

    申请日：2010-02-02

    申请人： Dacfey DZUNG ,  Mats Larsson

    发明人： Dacfey DZUNG ,  Mats Larsson

    IPC分类号： G04G7/02 ,  G04G99/00

    CPC分类号： H04J3/0682 ,  H02J13/0017 ,  H04J3/0644 ,  Y02E60/7807 ,  Y04S10/527 ,  Y04S40/12

    摘要： Time synchronization of two clocks is disclosed herein, such as two stationary clocks. A global time signal from a global time reference or common time source can be used to calculate a common view based clock offset between the two clocks. In parallel, a network based clock offset between the two clocks can be calculated based on messages exchanged over a communication network interconnecting the two clocks, without reverting to the global time reference. Two recent values (e.g., the two most recent values) of the common view clock offset and the network based clock offset can be combined or superposed in a seamless way to produce a final time offset estimate. The combination of independently calculated common view and network based clock offsets can be a weighted average of the two values, involving respective weights based on quality estimates of the latter. The time synchronization schemes based on a Global Positioning System (GPS) and a wide area communication network can be combined to synchronize the stationary clocks of phasor measurement units (PMUs) of a wide area monitoring system to a central server clock at a Network Control Center (NCC) of the system.

    摘要翻译： 这里公开了两个时钟的时间同步，诸如两个固定时钟。 来自全局时间参考或公共时间源的全局时间信号可用于计算两个时钟之间的基于公共视图的时钟偏移。 并行地，可以基于通过互连两个时钟的通信网络交换的消息来计算两个时钟之间的基于网络的时钟偏移，而不返回到全局时间参考。 公共视图时钟偏移和基于网络的时钟偏移的两个最近的值（例如，两个最近的值）可以以无缝方式组合或重叠以产生最终时间偏移估计。 独立计算的共同视图和基于网络的时钟偏移的组合可以是两个值的加权平均值，涉及基于后者的质量估计的相应权重。 可以组合基于全球定位系统（GPS）和广域通信网络的时间同步方案，以将广域监控系统的相量测量单元（PMU）的固定时钟与网络控制中心的中央服务器时钟同步 （NCC）的系统。

    Method and apparatus of setting clock time and using time data in a vehicle navigation system
    6.
    发明授权
    Method and apparatus of setting clock time and using time data in a vehicle navigation system 失效
    在车载导航系统中设置时钟时间和使用时间数据的方法和装置

    公开(公告)号：US5842146A

    公开(公告)日：1998-11-24

    申请号：US644869

    申请日：1996-05-10

    申请人： Kan Shishido

    发明人： Kan Shishido

    IPC分类号： G01C21/26 ,  G01S5/14 ,  G01S19/48 ,  G04G7/02 ,  G01C21/00

    CPC分类号： G01C21/26 ,  G04R20/02

    摘要： A clock time adjustment system for a vehicle equipped with navigation system whereby the time on the system clock is adjusted based upon position of the vehicle and the time signal provided by the Global Positioning Satellite System (GPS). The navigation system is capable of determining vehicle position and the system memory is provided with data corresponding to regional time zones. The system determines the current position of the vehicle and then calculates the proper time for the vehicle's location using data corresponding to the regional time zone where the vehicle is currently located. The system also stores, into memory, road data having routes that are undesirable for travel at particular times which may then be used to adjust the trip route to the destination by comparing the road data and time to determine an optimal route that avoids roads that are undesirable for traveling during a specific period.

    摘要翻译： 一种用于配备有导航系统的车辆的时钟时间调整系统，由此基于车辆的位置和由全球定位卫星系统（GPS）提供的时间信号来调整系统时钟的时间。 该导航系统能够确定车辆位置，并且向系统存储器提供对应于区域时区的数据。 系统确定车辆的当前位置，然后使用与车辆当前所在的区域时区对应的数据来计算车辆位置的适当时间。 该系统还将具有在特定时间不希望行驶的路线的道路数据存储起来，然后可以通过比较道路数据和时间来调整到目的地的行驶路线，以确定避免道路的最佳路线 在特定时间内不适合旅行。

    Time measurement in a communications system, a communications system and a receiver for use in such a system
    7.
    发明授权
    Time measurement in a communications system, a communications system and a receiver for use in such a system 失效
    在这种系统中使用的通信系统，通信系统和接收机中的时间测量

    公开(公告)号：US5774057A

    公开(公告)日：1998-06-30

    申请号：US522575

    申请日：1995-09-01

    申请人： Stefan Kalbermatter

    发明人： Stefan Kalbermatter

    IPC分类号： H04Q7/14 ,  G04G7/02 ,  H04Q7/16 ,  H04H3/00 ,  H04J3/06 ,  H04L7/00

    CPC分类号： G04R20/08 ,  G04R20/14

    摘要： A communications system includes apparatus for generating a succession of time message signals, a central station having a transmitter for transmitting the time message signals, at least a first receiver for receiving the time message signals and timer circuits for determining the real time of receipt of each time message signal. Each time message signal is representative of the real time of receipt, by the first receiver, of a preceding time message. The first receiver includes a clock for providing the first receiver with an internal time signal. The clock is reset upon receipt of a first time message signal and is advanced, upon receipt of a subsequent time message signal, by the real time indicated by the subsequent time message signal.

    摘要翻译： 通信系统包括用于产生一系列时间消息信号的装置，具有用于发送时间消息信号的发射机的中心站，用于接收时间消息信号的至少第一接收机和用于确定每个 时间消息信号。 每个消息信号代表由第一接收机接收前一时间消息的实时时间。 第一接收机包括用于向第一接收机提供内部时间信号的时钟。 时钟在接收到第一时间消息信号时被重置，并且在接收到随后的时间消息信号时，由随后的时间消息信号指示的实时被提前。

    RF link control of satellite clocks
    9.
    发明授权
    RF link control of satellite clocks 失效
    射频链路控制卫星时钟

    公开(公告)号：US5506781A

    公开(公告)日：1996-04-09

    申请号：US253722

    申请日：1994-06-03

    申请人： Peter Cummiskey ,  Marvin A. Epstein ,  Lawrence J. Doyle

    发明人： Peter Cummiskey ,  Marvin A. Epstein ,  Lawrence J. Doyle

    IPC分类号： G04G5/00 ,  G01S19/09 ,  G01S19/42 ,  G04G7/02 ,  H04B7/15 ,  H04B7/212 ,  H04L7/00 ,  H04B7/19

    CPC分类号： H04B7/2125

    摘要： A system and method for maintaining a precise time standard among a system of orbiting satellites is disclosed. In an illustrative embodiment, atomic clock data is circulated among the satellites via RF crosslinks. Each satellite uses the received data as input to a Kalman process which acts to minimize the mean squared error among the satellite clocks to form a set of "ensemble clocks". The resulting ensemble clock values are then transmitted to an earth station where an offset between the ensemble clocks and Universal Time is computed. The offset is transmitted from the earth station to the satellites where it is used by the satellites to lock their on-board clocks to Universal Time, thereby creating a corrected system time. The corrected system time is transmitted, via RF crosslinks, to satellites not having operational on-board clocks. The satellites without atomic clocks employ phase locked loops to anchor their clocks to the corrected system time as it is received over the crosslinks.

    摘要翻译： 公开了一种在轨道卫星系统中保持精确的时间标准的系统和方法。 在说明性实施例中，原子钟数据通过RF交联在卫星之间循环。 每个卫星使用接收的数据作为卡尔曼过程的输入，其用于最小化卫星时钟之间的均方误差以形成一组“合成时钟”。 然后将所得到的集合时钟值发送到地球站，其中计算集成时钟和通用时间之间的偏移。 偏移量从地球站传输到由卫星使用的卫星，将其车载时钟锁定到通用时间，从而创建校正的系统时间。 校正的系统时间通过RF交联传输到不具有操作板载时钟的卫星。 没有原子钟的卫星采用锁相环来将它们的时钟锚定到校正的系统时间，因为它被接收在交联上。

    Method and apparatus for accurate time maintenance and display
    10.
    发明授权
    Method and apparatus for accurate time maintenance and display 失效
    方法和设备，用于准确的时间维护和显示

    公开(公告)号：US5469411A

    公开(公告)日：1995-11-21

    申请号：US236534

    申请日：1994-05-02

    申请人： Jeffrey R. Owen

    发明人： Jeffrey R. Owen

    IPC分类号： G04G5/00 ,  G04G7/02 ,  G04C11/00

    CPC分类号： G04R20/20

    摘要： A time keeping and display system, device, and method are shown and illustrated including radio signal broadcast of a time of day reference signal. Remote time keeping devices intermittently collect the time of day reference. Each remote device automatically captures a current state of a time keeping counter when capturing the time of day reference. The captured state of the time keeping counter is later compared to the received time of day reference to calculate an update relative to the time of day counter. The calculated update may be a calculated error later applied as an offset to the counter, or may be a sum of the received time of day and an elapsed time, later loaded into the counter. When the remote device has no pending higher priority tasks, a brief fixed execution time procedure modifies the time keeping counter as a function of the calculated update. Because the process of modifying the time keeping counter is brief, no perceivable discontinuity in device operation, i.e., time display updates or response to user interface activity, occurs while the processing element of the device is dedicated entirely, i.e., interrupts disabled, to the task of modifying the content of the time keeping counter.

    摘要翻译： 示出并示出了时间和显示系统，装置和方法，包括时间参考信号的无线电信号广播。 远程计时器间歇地收集时间参考。 当捕获时间参考时，每个远程设备自动捕获计时器的当前状态。 时间计数器的捕获状态稍后与接收的日间参考时间进行比较，以计算相对于时间计数器的更新。 所计算的更新可以是稍后应用于计数器的偏移量的计算错误，或者可以是接收到的时间和经过的时间之和，并且后来加载到计数器中。 当远程设备没有待处理的较高优先级任务时，简单的固定执行时间过程会根据计算的更新修改计时器。 由于修改计时器的过程很简单，在设备的处理元件完全专用（即中断被禁用）的情况下，不会发生设备操作的可察觉的不连续性，即时间显示更新或对用户界面活动的响应。 修改计时器内容的任务。