公开(公告)号：US20070152878A1

公开(公告)日：2007-07-05

申请号：US11324144

申请日：2005-12-29

申请人： Chi-Shin Wang ,  Zongde Qiu ,  Shridhara Kudrethaya ,  Jun Mo

发明人： Chi-Shin Wang ,  Zongde Qiu ,  Shridhara Kudrethaya ,  Jun Mo

IPC分类号： G01S5/14

CPC分类号： G01S19/24 ,  G01S19/246 ,  G01S19/27 ,  G01S19/29 ,  G01S19/34

摘要： The present invention provides GPS receivers capable of tracking very weak GPS signals particularly in an indoor environment without assistance from an external server or a network. In a preferred embodiment, a GPS receiver initially acquires and locks onto GPS satellite signals to compute receiver position outdoors. The GPS receiver then tracks at least one satellite signal indoors to maintain acquisition parameters for quick acquisition of GPS signals. To save power, the receiver automatically goes to the sleep state and periodically wakes up, i.e., powers up, to maintain the at least one satellite signal tracking. During the wakeup state, the receiver collects ephemeris data from the at least one satellite signal when the ephemeris data needs to be updated for quick acquisition of GPS signals.

摘要翻译： 本发明提供了能够跟踪非常弱的GPS信号的GPS接收机，特别是在室内环境中，无需外部服务器或网络的协助。 在一个优选实施例中，GPS接收机最初获取并锁定到GPS卫星信号上以在室外计算接收器位置。 GPS接收机然后在室内跟踪至少一个卫星信号，以维持采集参数，以便快速获取GPS信号。 为了节省电力，接收机自动进入睡眠状态并周期性地唤醒，即上电，以维持至少一个卫星信号跟踪。 在唤醒状态期间，当需要更新星历数据以快速获取GPS信号时，接收器从至少一个卫星信号收集星历数据。

公开(公告)号：US07570208B2

公开(公告)日：2009-08-04

申请号：US11324144

申请日：2005-12-29

申请人： Chi-Shin Wang ,  Zongde Qiu ,  Shridhara A. Kudrethaya ,  Jun Mo

发明人： Chi-Shin Wang ,  Zongde Qiu ,  Shridhara A. Kudrethaya ,  Jun Mo

IPC分类号： G01S5/14 ,  H04B1/16

CPC分类号： G01S19/24 ,  G01S19/246 ,  G01S19/27 ,  G01S19/29 ,  G01S19/34

摘要： The present invention provides GPS receivers capable of tracking very weak GPS signals particularly in an indoor environment without assistance from an external server or a network. In a preferred embodiment, a GPS receiver initially acquires and locks onto GPS satellite signals to compute receiver position outdoors. The GPS receiver then tracks at least one satellite signal indoors to maintain acquisition parameters for quick acquisition of GPS signals. To save power, the receiver automatically goes to the sleep state and periodically wakes up, i.e., powers up, to maintain the at least one satellite signal tracking. During the wakeup state, the receiver collects ephemeris data from the at least one satellite signal when the ephemeris data needs to be updated for quick acquisition of GPS signals.

摘要翻译： 本发明提供了能够跟踪非常弱的GPS信号的GPS接收机，特别是在室内环境中，无需外部服务器或网络的协助。 在一个优选实施例中，GPS接收机最初获取并锁定到GPS卫星信号上以在室外计算接收器位置。 GPS接收机然后在室内跟踪至少一个卫星信号，以维持采集参数，以便快速获取GPS信号。 为了节省电力，接收机自动进入睡眠状态并周期性地唤醒，即上电，以维持至少一个卫星信号跟踪。 在唤醒状态期间，当需要更新星历数据以快速获取GPS信号时，接收器从至少一个卫星信号收集星历数据。

公开(公告)号：US20070109189A1

公开(公告)日：2007-05-17

申请号：US11274054

申请日：2005-11-14

申请人： Zhike Jia ,  Shridhara Kudrethaya ,  Chi-Shin Wang

发明人： Zhike Jia ,  Shridhara Kudrethaya ,  Chi-Shin Wang

IPC分类号： G01S5/14

CPC分类号： G01S19/24

摘要： The techniques to detect and mitigate the false reacquisition in a global satellite navigation receiver are disclosed. The false reacquisition due to frequency side-lobes and code autocorrelation secondary lobes are considered for mitigation. A set of two threshold values is used to detect correct reacquisition and reject false reacquisition. While the reacquisition of the signal is straight forward when the correlation is clear with the power above the first threshold, it is not so clear when the power is between two thresholds. So a further search for the maximum power among the retained dwells results in correct reacquisition. The search range depends upon the signal blockage interval and receiver dynamics. The feedback from navigational solution may be used to determine the search range both in frequency and code phase. In the case of frequency side-lobes, which occur only at specified frequency components, these frequencies are tested for maximum power response. The code side-lobes have similar characteristics and can be distinguished by the actual peak.

摘要翻译： 公开了一种用于检测和减轻全球卫星导航接收机中的虚假重新捕获的技术。 由于频率旁瓣和代码自相关副瓣引起的虚假反射被考虑用于缓解。 一组两个阈值用于检测正确的重新获取并拒绝错误的重新获取。 当信号的重新获取是直接的，当相关性清楚时，功率高于第一阈值，当功率在两个阈值之间时不是很清楚。 因此，进一步搜索保留住宅中的最大权力会导致正确的重新获取。 搜索范围取决于信号阻塞间隔和接收机动态。 导航解决方案的反馈可用于确定频率和码相位的搜索范围。 在仅在特定频率分量下发生的频率旁瓣的情况下，测试这些频率以获得最大功率响应。 代码旁瓣具有相似的特征，可以通过实际峰值来区分。

公开(公告)号：US07859456B2

公开(公告)日：2010-12-28

申请号：US11548204

申请日：2006-10-10

申请人： Chi-Shin Wang ,  Zongde Qiu ,  Zhike Jia

发明人： Chi-Shin Wang ,  Zongde Qiu ,  Zhike Jia

IPC分类号： G01S19/24 ,  G01S19/25 ,  G01S19/27

CPC分类号： G01S19/27 ,  G01S19/246 ,  G01S19/254

摘要： The present invention provides systems and methods for enabling a navigation signal receiver to perform both data assisted and non-data assisted integration to provide better integration during signal acquisition, reacquisition and tracking. In data assisted integration mode, a receiver uses known or predicted data bits to remove the modulated data bits of a received signal prior to integration. In non data assisted integration mode, when the data bits are not known or predictable, the receiver uses an optimal estimation or maximum likelihood algorithm to determine the polarities of the modulated data bits of the received signal. This may be done by determining which of various possible bit pattern yields the maximum integrated power. When the modulated data bits are not known or predictable over a limited range, the receiver carries out data assisted integration over the known or predictable data bits and additional non data assisted integration.

摘要翻译： 本发明提供了使导航信号接收机能够执行数据辅助和非数据辅助集成的系统和方法，以在信号采集，重新采集和跟踪期间提供更好的集成。 在数据辅助积分模式中，接收机使用已知或预测的数据比特来在积分之前去除接收信号的调制数据比特。 在非数据辅助积分模式中，当数据比特未知或可预测时，接收机使用最优估计或最大似然算法来确定接收信号的调制数据比特的极性。 这可以通过确定各种可能的位模式中的哪一个产生最大集成功率来完成。 当调制数据位在有限范围内不知道或可预测时，接收机通过已知或可预测的数据位和附加的非数据辅助积分来执行数据辅助积分。

公开(公告)号：US20080117103A1

公开(公告)日：2008-05-22

申请号：US11561749

申请日：2006-11-20

申请人： Chi-Shin Wang ,  David Wang ,  Zongde Qiu

发明人： Chi-Shin Wang ,  David Wang ,  Zongde Qiu

IPC分类号： G01S5/14 ,  G01S1/00

CPC分类号： G01S19/34 ,  G01S19/258

摘要： The present invention provides methods and systems for keeping the ephemeris in a navigational receiver current to achieve fast TTFF without the need for connecting to an aiding network or remote server. In an embodiment, the receiver keeps the ephemeris current by downloading the ephemeris in the background. In the preferred embodiment, the receiver uses a background sleep/wake up process to download current ephemeris with minimal power drain. In this embodiment, the receiver alternates between a sleep mode and a wake up mode. During the wake up mode, the receiver attempts to download current ephemeris. The receiver then goes back to the sleep mode until the next wake up to conserve power. The receiver may wake up from the sleep mode to download the ephemeris when the stored ephemeris is no longer current or the ephemeris broadcasted from a satellite has been updated or based on receiver usage patterns.

摘要翻译： 本发明提供了用于将星历保持在导航接收机当中以在不需要连接到辅助网络或远程服务器的情况下实现快速TTFF的方法和系统。 在一个实施例中，接收器通过在背景中下载星历来保持星历当前的状态。 在优选实施例中，接收机使用背景睡眠/唤醒过程以最小的功率耗散来下载当前星历。 在该实施例中，接收器在睡眠模式和唤醒模式之间交替显示。 在唤醒模式下，接收端尝试下载当前星历。 接收器然后回到睡眠模式，直到下一次唤醒以节省电量。 当存储的星历不再是当前的或者从卫星广播的星历表已被更新或基于接收机使用模式时，接收机可以从休眠模式唤醒以下载星历。

公开(公告)号：US07436357B2

公开(公告)日：2008-10-14

申请号：US11561749

申请日：2006-11-20

申请人： Chi-Shin Wang ,  David Wang ,  Zongde Qiu

发明人： Chi-Shin Wang ,  David Wang ,  Zongde Qiu

IPC分类号： G01S5/14 ,  G01S1/02

CPC分类号： G01S19/34 ,  G01S19/258

摘要： The present invention provides methods and systems for keeping the ephemeris in a navigational receiver current to achieve fast TTFF without the need for connecting to an aiding network or remote server. In an embodiment, the receiver keeps the ephemeris current by downloading the ephemeris in the background. In the preferred embodiment, the receiver uses a background sleep/wake up process to download current ephemeris with minimal power drain. In this embodiment, the receiver alternates between a sleep mode and a wake up mode. During the wake up mode, the receiver attempts to download current ephemeris. The receiver then goes back to the sleep mode until the next wake up to conserve power. The receiver may wake up from the sleep mode to download the ephemeris when the stored ephemeris is no longer current or the ephemeris broadcasted from a satellite has been updated or based on receiver usage patterns.

摘要翻译： 本发明提供了用于将星历保持在导航接收机当中以在不需要连接到辅助网络或远程服务器的情况下实现快速TTFF的方法和系统。 在一个实施例中，接收器通过在背景中下载星历来保持星历当前的状态。 在优选实施例中，接收机使用背景睡眠/唤醒过程以最小的功率耗散来下载当前星历。 在该实施例中，接收器在睡眠模式和唤醒模式之间交替显示。 在唤醒模式下，接收端尝试下载当前星历。 接收器然后回到睡眠模式，直到下一次唤醒以节省电量。 当存储的星历不再是当前的或者从卫星广播的星历表已被更新或基于接收机使用模式时，接收机可以从休眠模式唤醒以下载星历。

公开(公告)号：US20080084336A1

公开(公告)日：2008-04-10

申请号：US11548204

申请日：2006-10-10

申请人： Chi-Shin Wang ,  Zongde Qiu ,  Zhike Jia

发明人： Chi-Shin Wang ,  Zongde Qiu ,  Zhike Jia

IPC分类号： H03M7/38

CPC分类号： G01S19/27 ,  G01S19/246 ,  G01S19/254

摘要： The present invention provides systems and methods for enabling a navigation signal receiver to perform both data assisted and non-data assisted integration to provide better integration during signal acquisition, reacquisition and tracking. In data assisted integration mode, a receiver uses known or predicted data bits to remove the modulated data bits of a received signal prior to integration. In non data assisted integration mode, when the data bits are not known or predictable, the receiver uses an optimal estimation or maximum likelihood algorithm to determine the polarities of the modulated data bits of the received signal. This may be done by determining which of various possible bit pattern yields the maximum integrated power. When the modulated data bits are not known or predictable over a limited range, the receiver carries out data assisted integration over the known or predictable data bits and additional non data assisted integration.

摘要翻译： 本发明提供了使导航信号接收机能够执行数据辅助和非数据辅助集成的系统和方法，以在信号采集，重新采集和跟踪期间提供更好的集成。 在数据辅助积分模式中，接收机使用已知或预测的数据比特来在积分之前去除接收信号的调制数据比特。 在非数据辅助积分模式中，当数据比特未知或可预测时，接收机使用最优估计或最大似然算法来确定接收信号的调制数据比特的极性。 这可以通过确定各种可能的位模式中的哪一个产生最大集成功率来完成。 当调制数据位在有限范围内不知道或可预测时，接收机通过已知或可预测的数据位和附加的非数据辅助积分来执行数据辅助积分。

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。

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）。

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。