利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

15 条记录 (耗时 0.023 秒)

    TCXO Replacement for GPS
    6.
    发明申请
    TCXO Replacement for GPS 有权
    TCXO替换GPS

    公开(公告)号：US20110227614A1

    公开(公告)日：2011-09-22

    申请号：US13025111

    申请日：2011-02-10

    申请人： Anand K. Anandakumar ,  Hyungjin Kim ,  Curtis Ling

    发明人： Anand K. Anandakumar ,  Hyungjin Kim ,  Curtis Ling

    IPC分类号： H03L7/08

    CPC分类号： H03L1/026 ,  G01S19/235 ,  H03L1/022 ,  H03L7/1976

    摘要： To determine the level of frequency drift of a crystal oscillator as a result of a change in the its temperature, the temperature of the crystal oscillator is sensed and used together with previously stored data that includes a multitude of drift values of the frequency of the crystal oscillator each associated with a temperature of the crystal oscillator. Optionally, upon initialization of a GPS receiver in which the crystal oscillator is disposed, an initial temperature of the crystal oscillator is measured and a PLL is set to an initial frequency in association with the initial temperature. When acquisition fails in a region, the ppm region is changed. The temperature of the crystal oscillator is periodically measured and compared with the initial temperature, and the acquisition process is reset if there is a significant change in temperature. The GPS processor enters the tracking phase when acquisition is successful.

    摘要翻译： 为了确定晶体振荡器的温度变化导致的晶体振荡器的频率漂移，晶体振荡器的温度与先前存储的包含晶体频率漂移值的数据一起被检测并使用 每个振荡器都与晶体振荡器的温度相关联。 可选地，在其中设置晶体振荡器的GPS接收机初始化时，测量晶体振荡器的初始温度，并将PLL设置为与初始温度相关联的初始频率。 当区域中的采集失败时，ppm区域发生变化。 周期性地测量晶体振荡器的温度并将其与初始温度进行比较，如果温度有明显变化，则采集过程将被重置。 采集成功后，GPS处理器进入跟踪阶段。

    Edge equalizer
    7.
    发明授权
    Edge equalizer 有权
    边缘均衡器

    公开(公告)号：US08917799B2

    公开(公告)日：2014-12-23

    申请号：US12905434

    申请日：2010-10-15

    申请人： Hyungjin Kim ,  Sridhar Ramesh ,  Curtis Ling

    发明人： Hyungjin Kim ,  Sridhar Ramesh ,  Curtis Ling

    IPC分类号： H03K9/00 ,  H04L27/00 ,  H04L25/03 ,  H04L25/02

    CPC分类号： H04L25/0204 ,  H04L25/022 ,  H04L25/0232 ,  H04L25/03828

    摘要： To compensate for roll-off while estimating a communication channel, an estimate of the channel is provided using a signal transmitted via the communication channel. The pilot tones positioned along the edges of the estimated channel are divided by the corresponding pilot tones of the received signal to generate a first number of ratios. An algorithm is thereafter applied to the first number of ratios to generate a second number of ratios associated with the non-pilot tones positioned along the edges of the estimated channel. Next, numbers that are inverse of the first and second number of ratios are applied to the pilot and non-pilot tones positioned along the edges of the estimated channel to compensate for the roll-offs in the estimated channel.

    摘要翻译： 为了在估计通信信道的同时补偿滚降，使用通过通信信道发送的信号来提供信道的估计。 沿着估计信道的边缘定位的导频音被除以接收信号的对应导频音，以产生第一数量的比率。 然后将算法应用于第一数量的比率以产生与沿着估计的信道的边缘定位的非导频音调相关联的第二数量的比率。 接下来，将与第一和第二比例数相反的数字应用于沿估计信道的边缘定位的导频和非导频音，以补偿估计信道中的滚降。

    Method and System for Precise Temperature and Timebase PPM Error Estimation Using Multiple Timebases
    8.
    发明申请
    Method and System for Precise Temperature and Timebase PPM Error Estimation Using Multiple Timebases 有权
    使用多个时基的精确温度和时基PPM误差估计的方法和系统

    公开(公告)号：US20120151244A1

    公开(公告)日：2012-06-14

    申请号：US13296340

    申请日：2011-11-15

    申请人： Curtis Ling ,  Xing Tan ,  Hyungjin Kim

    发明人： Curtis Ling ,  Xing Tan ,  Hyungjin Kim

    IPC分类号： G06F1/12

    CPC分类号： H04W56/001 ,  G01S19/14 ,  G01S19/235 ,  G06F1/12 ,  H03L1/02 ,  H03L1/026

    摘要： Methods and systems for precise temperature and timebase ppm error estimation using multiple timebases may comprise measuring a coarse reading of a temperature corresponding to the plurality of timebases. The frequencies of the timebases may be compared to generate a fine reading of the temperature based, at least in part, on the coarse reading and the comparison of the frequencies with respect to models of temperature dependencies for each of the timebases. The timebases may be calibrated utilizing the generated fine reading. The plurality of timebases may comprise different order temperature dependencies. The models of temperature dependencies of each of the plurality of timebases may be updated based, at least in part, on the fine reading of the temperature corresponding to the plurality of timebases. A global navigation satellite system (GNSS) clock signal may be utilized periodically to improve the accuracy of the calibration of the plurality of timebases.

    摘要翻译： 使用多个时基的精确温度和时基ppm误差估计的方法和系统可以包括测量对应于多个时基的温度的粗略读数。 可以比较时基的频率，至少部分地基于粗略读数和频率相对于每个时基的温度依赖性模型的比较而产生温度的精细读数。 可以使用生成的精细读数来校准时基。 多个时基可以包括不同的顺序温度依赖性。 至少部分地，可以基于对应于多个时间基的温度的精细读取来更新多个时基中的每一个的温度依赖性的模型。 周期性地可以利用全球导航卫星系统（GNSS）时钟信号来提高多个时基的校准精度。

    Vehicle detector using a loop sensor
    9.
    发明授权
    Vehicle detector using a loop sensor 失效
    车辆检测器采用环形传感器

    公开(公告)号：US06360163B1

    公开(公告)日：2002-03-19

    申请号：US09489545

    申请日：2000-01-21

    申请人： Dong-il Cho ,  Sung-Wook Kim ,  Hyungjin Kim ,  Jae-in Ko

    发明人： Dong-il Cho ,  Sung-Wook Kim ,  Hyungjin Kim ,  Jae-in Ko

    IPC分类号： G06F1900

    CPC分类号： G08G1/042

    摘要： A vehicle detector comprising a loop sensor, phase lock loop (PLL), frequency change detector, and a micro-processor including a logic circuit. Output of the PLL and the frequency change detector is inputted to the logic circuit, and the logic circuit performs logical OR operation of the output of the PLL and the output of the frequency change detector. The output of the logic circuit is used as a vehicle detection signal. The vehicle detector can detect vehicles at a low speed as well as vehicle at high speed accurately.

    摘要翻译： 一种车辆检测器，包括环路传感器，锁相环（PLL），频率变化检测器和包括逻辑电路的微处理器。 PLL和频率变化检测器的输出被输入到逻辑电路，并且逻辑电路执行PLL的输出和频率变化检测器的输出的逻辑或运算。 逻辑电路的输出用作车辆检测信号。 车辆检测器可以准确地高速检测车辆以及高速车辆。

    Method and system for precise temperature and timebase PPM error estimation using multiple timebases
    10.
    发明授权
    Method and system for precise temperature and timebase PPM error estimation using multiple timebases 有权
    使用多个时基的精确温度和时基PPM误差估计的方法和系统

    公开(公告)号：US08775851B2

    公开(公告)日：2014-07-08

    申请号：US13296340

    申请日：2011-11-15

    申请人： Curtis Ling ,  Xing Tan ,  Hyungjin Kim

    发明人： Curtis Ling ,  Xing Tan ,  Hyungjin Kim

    IPC分类号： G06F1/12 ,  G01S19/23 ,  H03L1/02

    CPC分类号： H04W56/001 ,  G01S19/14 ,  G01S19/235 ,  G06F1/12 ,  H03L1/02 ,  H03L1/026

    摘要： Methods and systems for precise temperature and timebase ppm error estimation using multiple timebases may comprise measuring a coarse reading of a temperature corresponding to the plurality of timebases. The frequencies of the timebases may be compared to generate a fine reading of the temperature based, at least in part, on the coarse reading and the comparison of the frequencies with respect to models of temperature dependencies for each of the timebases. The timebases may be calibrated utilizing the generated fine reading. The plurality of timebases may comprise different order temperature dependencies. The models of temperature dependencies of each of the plurality of timebases may be updated based, at least in part, on the fine reading of the temperature corresponding to the plurality of timebases. A global navigation satellite system (GNSS) clock signal may be utilized periodically to improve the accuracy of the calibration of the plurality of timebases.

    摘要翻译： 使用多个时基的精确温度和时基ppm误差估计的方法和系统可以包括测量对应于多个时基的温度的粗略读数。 可以比较时基的频率，至少部分地基于粗读和相对于每个时间基的温度依赖性模型的频率的比较来生成温度的精细读数。 可以使用生成的精细读数来校准时基。 多个时基可以包括不同的顺序温度依赖性。 至少部分地，可以基于对应于多个时间基的温度的精细读取来更新多个时基中的每一个的温度依赖性的模型。 周期性地可以利用全球导航卫星系统（GNSS）时钟信号来提高多个时基的校准精度。