公开(公告)号：US08391339B2

公开(公告)日：2013-03-05

申请号：US11428800

申请日：2006-07-05

申请人： Chi-Shin Wang ,  Jian Cheng ,  Zhike Jia ,  Shridhara A. Kudrethaya

发明人： Chi-Shin Wang ,  Jian Cheng ,  Zhike Jia ,  Shridhara A. Kudrethaya

IPC分类号： H04B1/00

CPC分类号： H04B1/7075 ,  H04B1/7085 ,  H04B1/7095 ,  H04B2201/70715

摘要： The present invention provides systems and methods for faster acquisition and more stable tracking of spread spectrum signals with lower computational load requirements. Instead of the present day practice of using only the Prompt correlator, the systems and methods of the invention use the sum of the powers of all the correlators of a channel to determine the acquisition or tracking of the signal. These systems and methods improve the signal acquisition speed resulting in a reduced Time-To-First-Fix (TTFF). Further, these systems and methods improve the acquisition and tracking sensitivity of the receiver.

摘要翻译： 本发明提供了具有较低计算负荷要求的用于更快速采集和更稳定地跟踪扩频信号的系统和方法。 代替现在仅使用提示相关器的做法，本发明的系统和方法使用信道的所有相关器的功率之和来确定信号的采集或跟踪。 这些系统和方法提高了信号采集速度，从而缩短了首次固定时间（TTFF）。 此外，这些系统和方法提高了接收机的采集和跟踪灵敏度。

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：US07479924B2

公开(公告)日：2009-01-20

申请号：US11274054

申请日：2005-11-14

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

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

IPC分类号： G01S1/00 ,  H04B1/00

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：US20090168851A1

公开(公告)日：2009-07-02

申请号：US11428800

申请日：2006-07-05

申请人： Chi-Shin Wang ,  Jian Cheng ,  Zhike Jia ,  Shridhara A. Kudrethaya

发明人： Chi-Shin Wang ,  Jian Cheng ,  Zhike Jia ,  Shridhara A. Kudrethaya

IPC分类号： H04B1/707

CPC分类号： H04B1/7075 ,  H04B1/7085 ,  H04B1/7095 ,  H04B2201/70715

摘要： The present invention provides systems and methods for faster acquisition and more stable tracking of spread spectrum signals with lower computational load requirements. Instead of the present day practice of using only the Prompt correlator, the systems and methods of the invention use the sum of the powers of all the correlators of a channel to determine the acquisition or tracking of the signal. These systems and methods improve the signal acquisition speed resulting in a reduced Time-To-First-Fix (TTFF). Further, these systems and methods improve the acquisition and tracking sensitivity of the receiver.

摘要翻译： 本发明提供了具有较低计算负荷要求的用于更快速采集和更稳定地跟踪扩频信号的系统和方法。 代替现在仅使用Prompt相关器的做法，本发明的系统和方法使用信道的所有相关器的功率之和来确定信号的采集或跟踪。 这些系统和方法提高了信号采集速度，从而缩短了首次固定时间（TTFF）。 此外，这些系统和方法提高了接收机的采集和跟踪灵敏度。