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1. 发明授权

US08000378B2 Narrow correlator technique for multipath mitigation 有权
标题翻译：用于多径缓解的窄相关器技术
公开(公告)号：US08000378B2
公开(公告)日：2011-08-16
申请号：US11615704
申请日：2006-12-22
申请人： Jun Mo , Shaowei Han
发明人： Jun Mo , Shaowei Han
IPC分类号： H04B1/00 , H04L27/06
CPC分类号： H04B1/7085 , H04B1/709 , H04B2201/70715
摘要： The present invention provides systems and methods for implementing narrowly spaced correlators to mitigate multipath error, and systems and methods for adaptively changing the correlator spacing for varying multipath conditions. In an embodiment, two sets of correlators with the same code frequency but different code phases are used to implement an adjustable correlator spacing. The correlator spacing is determined by the code phase difference between the two sets of correlators, which can be adjusted, e.g., by adjusting the code phase values of Numerically Controlled Oscillators (NCOs). An advantage of embodiments of the present invention is that they can achieve much narrower correlator spacings than conventional techniques, e.g., by making the code phase difference between the two sets of correlators very small. Further, the correlator spacing can be adjusted for varying multipath conditions, whereas the correlator spacing in conventional techniques is fixed.
摘要翻译：本发明提供了用于实现窄间隔相关器以减轻多路径误差的系统和方法，以及用于自适应地改变相关器间隔以用于变化的多径条件的系统和方法。在一个实施例中，使用具有相同代码频率但不同代码阶段的两组相关器来实现可调整的相关器间隔。相关器间距由两组相关器之间的码相位差确定，这可以通过例如调节数控振荡器（NCO）的码相位值来调整。本发明的实施例的优点在于，它们可以实现比常规技术更窄的相关器间隔，例如通过使两组相关器之间的码相位差非常小。此外，可以针对变化的多径条件来调整相关器间距，而常规技术中的相关器间隔是固定的。

2. 发明授权

US07459984B2 Method and apparatus for self-calibration and adaptive temperature compensation in GPS receivers 有权
标题翻译： GPS接收机中自校准和自适应温度补偿的方法和装置
公开(公告)号：US07459984B2
公开(公告)日：2008-12-02
申请号：US11140492
申请日：2005-05-26
申请人： Chi-Shin Wang , Kudrethaya A. Shridhara , Jun Mo , Shaowei Han , Hansheng Wang
发明人： Chi-Shin Wang , Kudrethaya A. Shridhara , Jun Mo , Shaowei Han , Hansheng Wang
IPC分类号： H03L1/00 , G01S1/00
CPC分类号： H03L1/026 , G01S19/235
摘要： The invention provides a method and apparatus to optimally estimate and adaptively compensate the temperature-induced frequency drift of a crystal oscillator in a navigational signal receiver. A Read-Write memory encodes two tables, one for looking up frequency drift values versus temperature readings and another one for valid data confirmation on the first table. The initially empty look-up table is gradually populated with frequency drift values while the receiver computes the frequency drift along with its position. During initial start of the receiver or re-acquisition of satellite signals, the stored frequency drift value corresponding to the current temperature is used. If no valid frequency drift value is available, the frequency drift value is computed based on the existing frequency drift values in the table. This invention reduces the Time-To-First-Fix (TTFF) of the receiver and enables the receiver to self-calibrate, thus no additional factory calibration would be necessary.
摘要翻译：本发明提供了一种方法和装置，用于对导航信号接收机中的晶体振荡器的温度感应频率漂移进行最佳估计和自适应补偿。读写存储器编码两个表，一个用于查找频率漂移值与温度读数，另一个用于在第一个表上进行有效数据确认。初始空的查找表逐渐填充频率漂移值，而接收器计算频率漂移及其位置。在接收机初始启动或重新采集卫星信号时，使用与当前温度对应的存储频率漂移值。如果没有有效的频率漂移值可用，则基于表中现有的频率漂移值来计算频率漂移值。本发明减少了接收机的首次定时（TTFF），使得接收机能够自校准，因此不需要额外的工厂校准。

3. 发明申请

US20080151971A1 NARROW CORRELATOR TECHNIQUE FOR MULTIPATH MITIGATION 有权
标题翻译：用于多路减速的NARROW CORRERATOR技术
公开(公告)号：US20080151971A1
公开(公告)日：2008-06-26
申请号：US11615704
申请日：2006-12-22
申请人： Jun Mo , Shaowei Han
发明人： Jun Mo , Shaowei Han
IPC分类号： H04B1/707
CPC分类号： H04B1/7085 , H04B1/709 , H04B2201/70715
摘要： The present invention provides systems and methods for implementing narrowly spaced correlators to mitigate multipath error, and systems and methods for adaptively changing the correlator spacing for varying multipath conditions. In an embodiment, two sets of correlators with the same code frequency but different code phases are used to implement an adjustable correlator spacing. The correlator spacing is determined by the code phase difference between the two sets of correlators, which can be adjusted, e.g., by adjusting the code phase values of Numerically Controlled Oscillators (NCOs). An advantage of embodiments of the present invention is that they can achieve much narrower correlator spacings than conventional techniques, e.g., by making the code phase difference between the two sets of correlators very small. Further, the correlator spacing can be adjusted for varying multipath conditions, whereas the correlator spacing in conventional techniques is fixed.
摘要翻译：本发明提供了用于实现窄间隔相关器以减轻多路径误差的系统和方法，以及用于自适应地改变相关器间隔以用于变化的多径条件的系统和方法。在一个实施例中，使用具有相同代码频率但不同代码阶段的两组相关器来实现可调整的相关器间隔。相关器间距由两组相关器之间的码相位差确定，这可以通过例如调节数控振荡器（NCO）的码相位值来调整。本发明的实施例的优点在于，它们可以实现比常规技术更窄的相关器间隔，例如通过使两组相关器之间的码相位差非常小。此外，可以针对变化的多径条件来调整相关器间距，而常规技术中的相关器间隔是固定的。

4. 发明申请

US20090002226A1 POSITION AND TIME DETERMINATION UNDER WEAK SIGNAL CONDITIONS 有权
标题翻译：在弱信号条件下的位置和时间确定
公开(公告)号：US20090002226A1
公开(公告)日：2009-01-01
申请号：US11771845
申请日：2007-06-29
申请人： Jun Mo , Shaowei Han
发明人： Jun Mo , Shaowei Han
IPC分类号： G01S1/00
CPC分类号： G01S19/24 , G01S19/42
摘要： Described herein are systems and methods that are capable of determining receiver position and system time under weak signal conditions. When the receiver is unable to accurately determine the satellite signal travel time, e.g., due to weak signal reception or some other condition, the receiver can still estimate the pseudo-range for the satellite based on an initial receiver position and system time. In this case, the system and methods described herein provide the necessary initial receiver position and system time with enough accuracy to estimate the pseudo-range, even under weak signal conditions. The receiver can then use the estimated pseudo-range to determine a more accurate receiver position.
摘要翻译：这里描述的是能够在弱信号条件下确定接收机位置和系统时间的系统和方法。当接收机不能准确地确定卫星信号传播时间时，例如由于信号接收弱或某种其他条件，接收机仍然可以基于初始的接收机位置和系统时间来估计卫星的伪距离。在这种情况下，即使在弱信号条件下，本文所述的系统和方法也提供了足够准确的必要的初始接收机位置和系统时间来估计伪距离。然后，接收机可以使用估计的伪距来确定更准确的接收机位置。

5. 发明申请

US20060267703A1 Method and apparatus for self-calibration and adaptive temperature compensation in GPS receivers 有权
标题翻译： GPS接收机中自校准和自适应温度补偿的方法和装置
公开(公告)号：US20060267703A1
公开(公告)日：2006-11-30
申请号：US11140492
申请日：2005-05-26
申请人： Chi-Shin Wang , Kudrethaya Shridhara , Jun Mo , Shaowei Han , Hansheng Wang
发明人： Chi-Shin Wang , Kudrethaya Shridhara , Jun Mo , Shaowei Han , Hansheng Wang
IPC分类号： H03L1/00
CPC分类号： H03L1/026 , G01S19/235
摘要： The invention provides a method and apparatus to optimally estimate and adaptively compensate the temperature-induced frequency drift of a crystal oscillator in a navigational signal receiver. A Read-Write memory encodes two tables, one for looking up frequency drift values versus temperature readings and another one for valid data confirmation on the first table. The initially empty look-up table is gradually populated with frequency drift values while the receiver computes the frequency drift along with its position. During initial start of the receiver or re-acquisition of satellite signals, the stored frequency drift value corresponding to the current temperature is used. If no valid frequency drift value is available, the frequency drift value is computed based on the existing frequency drift values in the table. This invention reduces the Time-To-First-Fix (TTFF) of the receiver and enables the receiver to self-calibrate, thus no additional factory calibration would be necessary.
摘要翻译：本发明提供了一种方法和装置，用于对导航信号接收机中的晶体振荡器的温度感应频率漂移进行最佳估计和自适应补偿。读写存储器编码两个表，一个用于查找频率漂移值与温度读数，另一个用于在第一个表上进行有效数据确认。初始空的查找表逐渐填充频率漂移值，而接收器计算频率漂移及其位置。在接收机初始启动或重新采集卫星信号时，使用与当前温度对应的存储频率漂移值。如果没有有效的频率漂移值可用，则基于表中现有的频率漂移值来计算频率漂移值。本发明减少了接收机的首次定时（TTFF），使得接收机能够自校准，因此不需要额外的工厂校准。

6. 发明申请

US20060250304A1 System and method for fast initialization of navigational satellite signal receivers 有权
标题翻译：导航卫星信号接收机快速初始化的系统和方法
公开(公告)号：US20060250304A1
公开(公告)日：2006-11-09
申请号：US11124413
申请日：2005-05-06
申请人： Jun Mo , Hansheng Wang , Chi-Shin Wang , Shaowei Han , Kudrethaya Shridhara
发明人： Jun Mo , Hansheng Wang , Chi-Shin Wang , Shaowei Han , Kudrethaya Shridhara
IPC分类号： G01S5/14
CPC分类号： G01S19/28
摘要： The present invention provides a method and apparatus for a satellite navigation receiver to lock onto satellite signals in the cold start mode with no information on the receiver position, the satellite position, or time estimates stored in the receiver's memory. All satellites in a positioning system are divided into groups based on the satellite constellation structure. In an embodiment, the positioning system is the Global Positioning System (GPS) and all GPS satellites are divided into three groups. During initialization of the receiver, the satellites are searched per group to lock onto at least one satellite signal. Other satellites are then searched in a given order based on their respective distance or proximity to the first satellite acquired. This method reduces the Time-to-First-Fix (TTFF) ordinarily required by conventional receivers in the cold start mode.
摘要翻译：本发明提供了一种用于卫星导航接收机在冷启动模式下锁定卫星信号的方法和装置，其中没有关于存储在接收机的存储器中的接收机位置，卫星位置或时间估计的信息。基于卫星星座结构将定位系统中的所有卫星分成几组。在一个实施例中，定位系统是全球定位系统（GPS），所有GPS卫星分为三组。在接收机的初始化期间，每组搜索卫星以锁定至少一个卫星信号。然后根据其相应的距离或与所获取的第一卫星的距离，以给定的顺序搜索其他卫星。这种方法减少了常规接收机在冷启动模式下通常要求的首次固定时间（TTFF）。

7. 发明授权

US07567208B2 Position and time determination under weak signal conditions 有权
标题翻译：弱信号条件下的位置和时间确定
公开(公告)号：US07567208B2
公开(公告)日：2009-07-28
申请号：US11771845
申请日：2007-06-29
申请人： Jun Mo , Shaowei Han
发明人： Jun Mo , Shaowei Han
IPC分类号： G01S1/00
CPC分类号： G01S19/24 , G01S19/42
摘要： Described herein are systems and methods that are capable of determining receiver position and system time under weak signal conditions. When the receiver is unable to accurately determine the satellite signal travel time, e.g., due to weak signal reception or some other condition, the receiver can still estimate the pseudo-range for the satellite based on an initial receiver position and system time. In this case, the system and methods described herein provide the necessary initial receiver position and system time with enough accuracy to estimate the pseudo-range, even under weak signal conditions. The receiver can then use the estimated pseudo-range to determine a more accurate receiver position.
摘要翻译：这里描述的是能够在弱信号条件下确定接收机位置和系统时间的系统和方法。当接收机不能准确地确定卫星信号传播时间时，例如由于信号接收弱或某种其他条件，接收机仍然可以基于初始的接收机位置和系统时间来估计卫星的伪距离。在这种情况下，即使在弱信号条件下，本文所述的系统和方法也提供了足够准确的必要的初始接收机位置和系统时间来估计伪距离。然后，接收机可以使用估计的伪距来确定更准确的接收机位置。

8. 发明授权

US07324045B2 System and method for fast initialization of navigational satellite signal receivers 有权
标题翻译：导航卫星信号接收机快速初始化的系统和方法
公开(公告)号：US07324045B2
公开(公告)日：2008-01-29
申请号：US11124413
申请日：2005-05-06
申请人： Jun Mo , Hansheng Wang , Chi-Shin Wang , Shaowei Han , Kudrethaya A. Shridhara
发明人： Jun Mo , Hansheng Wang , Chi-Shin Wang , Shaowei Han , Kudrethaya A. Shridhara
IPC分类号： G01S1/00 , H04B7/185 , H04B1/00
CPC分类号： G01S19/28
摘要： The present invention provides a method and apparatus for a satellite navigation receiver to lock onto satellite signals in the cold start mode with no information on the receiver position, the satellite position, or time estimates stored in the receiver's memory. All satellites in a positioning system are divided into groups based on the satellite constellation structure. In an embodiment, the positioning system is the Global Positioning System (GPS) and all GPS satellites are divided into three groups. During initialization of the receiver, the satellites are searched per group to lock onto at least one satellite signal. Other satellites are then searched in a given order based on their respective distance or proximity to the first satellite acquired. This method reduces the Time-to-First-Fix (TTFF) ordinarily required by conventional receivers in the cold start mode.
摘要翻译：本发明提供了一种用于卫星导航接收机在冷启动模式下锁定卫星信号的方法和装置，其中没有关于存储在接收机的存储器中的接收机位置，卫星位置或时间估计的信息。基于卫星星座结构将定位系统中的所有卫星分成几组。在一个实施例中，定位系统是全球定位系统（GPS），所有GPS卫星分为三组。在接收机的初始化期间，每组搜索卫星以锁定至少一个卫星信号。然后根据其相应的距离或与所获取的第一卫星的距离，以给定的顺序搜索其他卫星。这种方法减少了常规接收机在冷启动模式下通常要求的首次固定时间（TTFF）。

9. 发明授权

US08635016B2 Systems and methods of communication in an assisted navigation system 有权
标题翻译：辅助导航系统中的通信系统和方法
公开(公告)号：US08635016B2
公开(公告)日：2014-01-21
申请号：US13564468
申请日：2012-08-01
申请人： Shaowei Han , Wentao Zhang
发明人： Shaowei Han , Wentao Zhang
IPC分类号： G01C21/00
CPC分类号： G01S19/25 , G01S19/05 , G01S19/27
摘要： Provided herein are methods and systems for efficient communication between a server and a client in an assisted navigation system. In one or more embodiments, the server transmits a set of parameters for a satellite to the client, e.g., a GPS receiver, via a wireless or wired connection. The set of parameters includes a force parameter, initial condition parameters and time correction coefficients for the satellite. The receiver uses the received parameters in a numerical integration to compute the position of the satellite at a desired time. The set of parameters needed for the integration is small. To further reduce the amount of data transmitted, reference parameters may be subtracted from the original parameters before transmission from the server. The receiver is able to reconstruct the original parameters from the received parameters and the identically computed reference parameters. The parameters may be further compressed using data compression techniques.
摘要翻译：这里提供了用于在辅助导航系统中的服务器和客户端之间的有效通信的方法和系统。在一个或多个实施例中，服务器经由无线或有线连接向卫星发送一组用于卫星的参数，例如GPS接收机。该组参数包括一个力参数，初始条件参数和卫星的时间校正系数。接收机使用数字积分中接收到的参数来计算卫星在所需时间的位置。集成所需的一组参数很小。为了进一步减少发送的数据量，可以在从服务器发送之前从原始参数中减去参考参数。接收机能够从接收的参数和相同计算的参考参数重建原始参数。可以使用数据压缩技术来进一步压缩参数。

10. 发明授权

US08086405B2 Compensation for mounting misalignment of a navigation device 有权
标题翻译：用于安装导航装置的未对准的补偿
公开(公告)号：US08086405B2
公开(公告)日：2011-12-27
申请号：US11823964
申请日：2007-06-28
申请人： Shaowei Han , Xiaoji Niu , Changlin Ma
发明人： Shaowei Han , Xiaoji Niu , Changlin Ma
IPC分类号： G01C21/00
CPC分类号： G01C21/16 , G01C21/265 , G01C21/28
摘要： Compensating for the misalignment of a navigation device with respect to a vehicle is described. In one example, the compensation is made by applying a high pass filter to a measured acceleration of the vehicle to produce a motion acceleration signal, weighting the motion acceleration signal with a measured steering rate of the vehicle, and deriving misalignment parameters for the navigation device with respect to the vehicle using the weighted motion acceleration signal.
摘要翻译：描述了导航装置相对于车辆的不对准的补偿。在一个示例中，通过对车辆的测量加速度应用高通滤波器来产生运动加速度信号，以车辆的测量转向速率对运动加速度信号加权，以及导出导航装置的未对准参数来进行补偿相对于使用加权运动加速度信号的车辆。

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