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1. 发明申请

US20080117103A1 BACKGROUND EPHEMERIS DOWNLOAD IN NAVIGATIONAL RECEIVERS 有权
标题翻译：背景EPHEMERIS下载在导航接收机
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 The receiver may wake up from the sleep mode to download the ephemeris when the stored ephemeris is no longer current or the ephemeris broadcasted from a satellite has been updated or based on receiver usage patterns.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。

2. 发明授权

US07436357B2 Background ephemeris download in navigational receivers 有权
标题翻译：背景星历在导航接收器中下载
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。

3. 发明授权

US07859456B2 Method of mixed data assisted and non data assisted navigation signal acquisition, tracking and reacquisition 有权
标题翻译：混合数据辅助和非数据辅助导航信号采集，跟踪和重新采集的方法
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。

4. 发明授权

US07570208B2 Unassisted indoor GPS receiver 有权
标题翻译：无人值守的室内GPS接收器
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。

5. 发明申请

US20070152878A1 Unassisted indoor GPS receiver 有权
标题翻译：无人值守的室内GPS接收器
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。

6. 发明申请

US20080084336A1 METHOD OF MIXED DATA ASSISTED AND NON DATA ASSISTED NAVIGATION SIGNAL ACQUISITION, TRACKING AND REACQUISITION 有权
标题翻译：混合数据辅助方法和非数据辅助导航信号获取，跟踪和反应
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。

7. 发明申请

US20080117100A1 NAVIGATION SIGNAL RECEIVER TRAJECTORY DETERMINATION 有权
标题翻译：导航信号接收机测距
公开(公告)号：US20080117100A1
公开(公告)日：2008-05-22
申请号：US11561758
申请日：2006-11-20
申请人： Chi-Shin Wang , David Wang , Wentao Zhang , Jun Mo , Lei Dong
发明人： Chi-Shin Wang , David Wang , Wentao Zhang , Jun Mo , Lei Dong
IPC分类号： G01S5/14
CPC分类号： G01S19/49 , G01S19/40
摘要： The present invention provides methods and systems that enable a mobile navigation receiver to accurately determine its trajectory with non-current ephemeris in stand-alone mode. In an embodiment, the receiver computes the position for the same location using non-current ephemeris and current ephemeris at different time instances. The receiver then determines a position correction by finding the difference between these two computed positions, and applies this correction to the trajectory generated with non-current ephemeris to obtain a more accurate trajectory. In another embodiment, the receiver computes an initial position of the receiver using non-current ephemeris and finds the difference between the computed initial position and an accurate approximation of the initial position. The receiver then shifts the subsequent receiver trajectory computed using non-current ephemeris by the difference to obtain a more accurate trajectory.
摘要翻译：本发明提供使移动导航接收机能够以独立模式的非当前星历精确地确定其轨迹的方法和系统。在一个实施例中，接收机使用不同时间的非当前星历和当前星历表计算相同位置的位置。然后，接收机通过找到这两个计算位置之间的差异来确定位置校正，并将该校正应用于由非当前星历产生的轨迹，以获得更准确的轨迹。在另一个实施例中，接收机使用非当前星历表计算接收机的初始位置，并且找出所计算的初始位置与初始位置的精确近似之间的差。然后，接收器将使用非当前星历计算的后续接收器轨迹移动该差，以获得更准确的轨迹。

8. 发明授权

US07439907B2 Navigation signal receiver trajectory determination 有权
标题翻译：导航信号接收机轨迹确定
公开(公告)号：US07439907B2
公开(公告)日：2008-10-21
申请号：US11561758
申请日：2006-11-20
申请人： Chi-Shin Wang , David Wang , Wentao Zhang , Jun Mo , Lei Dong
发明人： Chi-Shin Wang , David Wang , Wentao Zhang , Jun Mo , Lei Dong
IPC分类号： G01S3/14
CPC分类号： G01S19/49 , G01S19/40
摘要： The present invention provides methods and systems that enable a mobile navigation receiver to accurately determine its trajectory with non-current ephemeris in stand-alone mode. In an embodiment, the receiver computes the position for the same location using non-current ephemeris and current ephemeris at different time instances. The receiver then determines a position correction by finding the difference between these two computed positions, and applies this correction to the trajectory generated with non-current ephemeris to obtain a more accurate trajectory. In another embodiment, the receiver computes an initial position of the receiver using non-current ephemeris and finds the difference between the computed initial position and an accurate approximation of the initial position. The receiver then shifts the subsequent receiver trajectory computed using non-current ephemeris by the difference to obtain a more accurate trajectory.
摘要翻译：本发明提供使移动导航接收机能够以独立模式的非当前星历精确地确定其轨迹的方法和系统。在一个实施例中，接收机使用不同时间的非当前星历和当前星历表计算相同位置的位置。然后，接收机通过找到这两个计算位置之间的差异来确定位置校正，并将该校正应用于由非当前星历产生的轨迹，以获得更准确的轨迹。在另一个实施例中，接收机使用非当前星历表计算接收机的初始位置，并且找出所计算的初始位置与初始位置的精确近似之间的差。然后，接收器将使用非当前星历计算的后续接收器轨迹移动该差，以获得更准确的轨迹。

9. 发明授权

US08466836B2 Fast fourier transform with down sampling based navigational satellite signal tracking 有权
标题翻译：快速傅里叶变换与基于下采样的导航卫星信号跟踪
公开(公告)号：US08466836B2
公开(公告)日：2013-06-18
申请号：US11218298
申请日：2005-08-31
申请人： Zhike Jia , Chi-Shin Wang
发明人： Zhike Jia , Chi-Shin Wang
IPC分类号： G01S19/24 , G01S19/35
CPC分类号： G01S19/24 , G01S19/246 , G01S19/29 , G01S19/35 , H04B1/7085
摘要： A method and device to track navigational satellite signals, are claimed. In this invention, a combination of down-sampling and frequency domain transformation are used to track the navigational satellite signals under dynamic environment. A Fast Fourier Transform (FFT) with long coherent integration has been employed to determine the varying frequency components with high resolution. By representing a number of correlation values with their average value, it is possible to represent a long sequence of input values by a smaller number of values and a relatively short length FFT can reveal the low frequency components that are present in the signal during tracking operation. A large reduction in the computational load may be achieved using this down-sampling method without compromising on the frequency resolution.
摘要翻译：声称用于跟踪导航卫星信号的方法和装置。在本发明中，使用下采样和频域变换的组合来跟踪在动态环境下的导航卫星信号。已经采用具有长相干积分的快速傅里叶变换（FFT）来确定具有高分辨率的变化频率分量。通过用其平均值表示多个相关值，可以通过较小数量的值表示输入值的长序列，并且相对较短的长度可以显示在跟踪操作期间在信号中存在的低频分量。使用这种下采样方法可以在不影响频率分辨率的情况下实现计算负荷的大幅度减小。

10. 发明授权

US07903028B2 Ephemeris download from weak signals 有权
标题翻译：短信从弱信号下载
公开(公告)号：US07903028B2
公开(公告)日：2011-03-08
申请号：US11612421
申请日：2006-12-18
申请人： Chi-Shin Wang , Yue-Meng Chen , Zhike Jia , EnYuan Tu
发明人： Chi-Shin Wang , Yue-Meng Chen , Zhike Jia , EnYuan Tu
IPC分类号： G01S19/07
CPC分类号： H04B7/18589 , G01S19/243 , G01S19/246 , G01S19/27
摘要： The present invention provides systems and methods for downloading navigation data to a satellite receiver under weak signal conditions. In an embodiment, the receiver uses a tracking algorithm to estimate the Doppler frequency and rate of change of the Doppler frequency to compensate the phases of the I/Q samples from the received signal to reduce the effect of the Doppler frequency. In an embodiment, differential detection based data bit decoding is provided. In another embodiment, phase compensation based data bit decoding is provided, in which the phase of samples are rotated to compensate for phase error. In an embodiment, a multiple frame strategy is provided to increase signal-to-noise ratio (SNR) and improve sensitivity, in which similar placed samples in consecutive frames are coherently summed over the consecutive frames. In an embodiment, the samples are weighted to reduce the impact of noise in the multiple frame strategy.
摘要翻译：本发明提供了在弱信号条件下将导航数据下载到卫星接收机的系统和方法。在一个实施例中，接收机使用跟踪算法来估计多普勒频率的多普勒频率和变化率，以便从接收信号中补偿I / Q采样的相位，以减少多普勒频率的影响。在一个实施例中，提供了基于差分检测的数据比特解码。在另一个实施例中，提供了基于相位补偿的数据比特解码，其中样本的相位被旋转以补偿相位误差。在一个实施例中，提供多帧策略以增加信噪比（SNR）并提高灵敏度，其中连续帧中的类似放置样本在连续帧上相干相加。在一个实施例中，加权样本以减少多帧策略中噪声的影响。

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