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：US20070152876A1

公开(公告)日：2007-07-05

申请号：US11322654

申请日：2005-12-29

申请人： Chi-Shin Wang ,  Lianxue Xiong ,  Zhike Jia ,  Lei Dong ,  Jingbin Liu

发明人： Chi-Shin Wang ,  Lianxue Xiong ,  Zhike Jia ,  Lei Dong ,  Jingbin Liu

IPC分类号： G01S5/14

CPC分类号： G01S19/235 ,  G01S19/23 ,  G01S19/26 ,  G01S19/34

摘要： The present invention provides GPS receivers with clock calibration for fast reacquisition of GPS signals after waking up from a sleep state or coming out of signal blockage. In a preferred embodiment, a GPS receiver comprises a local clock based on an oscillator, e.g., crystal oscillator. The GPS receiver calculates a clock calibration value based on a computed oscillator count for the period during which the GPS receiver is in the sleep state or the signal is blocked. This clock calibration value is used to calibrate the local clock after the GPS receiver wakes up or comes out of signal blockage for fast reacquisition of GPS signals.

摘要翻译： 本发明提供具有时钟校准的GPS接收机，用于在从休眠状态唤醒或从信号阻塞出来之后快速重新捕获GPS信号。 在优选实施例中，GPS接收机包括基于例如晶体振荡器的振荡器的本地时钟。 GPS接收机基于GPS接收机处于睡眠状态或信号被阻塞的周期的计算振荡器计数来计算时钟校准值。 该时钟校准值用于在GPS接收器唤醒或者信号阻塞之后校准本地时钟，以快速重新获取GPS信号。

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：US20070013583A1

公开(公告)日：2007-01-18

申请号：US11179353

申请日：2005-07-12

申请人： Chi-Shin Wang ,  Zhike Jia ,  Hansheng Wang

发明人： Chi-Shin Wang ,  Zhike Jia ,  Hansheng Wang

IPC分类号： G01S5/14

CPC分类号： G01S19/30

摘要： A method and device to acquire navigational satellite signals combines non-coherent and coherent integrations and can efficiently acquire both strong and weak signals. Successive steps eliminate lower powered and less likely combinations of code offsets and carrier frequencies or dwells of a given satellite signal. Only remaining dwells then are correlated and integrated over larger time duration to obtain the most probable dwell or dwells, which results in reduced computational load. The selection of most likely dwells is based on Parseval's theorem on equivalence of power in time and frequency domains. An optimal estimator algorithm efficiently estimates the probable navigation data bits embedded in the received signal. In case of an ambiguity due to several possible dwells, the steps are repeated with a new set of signal samples.

摘要翻译： 一种获取导航卫星信号的方法和装置组合了非相干和相干的整合，可以有效地获得强信号和弱信号。 相继的步骤消除了给定卫星信号的代码偏移和载波频率或驻留的较低功率和不太可能的组合。 然后，只有剩余的住宅在较大的持续时间内相关并整合以获得最可能的停留或停留，这导致减少的计算负荷。 最可能的住宅选择是基于时间和频域功率等效的Parseval定理。 最优估计算法有效地估计嵌入在接收信号中的可能的导航数据位。 在由于几个可能的住宅而引起歧义的情况下，用新的一组信号样本重复这些步骤。

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：US07743177B2

公开(公告)日：2010-06-22

申请号：US11771976

申请日：2007-06-29

申请人： Zhike Jia ,  Chi-Shin Wang ,  Lianxue Xiong ,  Hongyu Zhang

发明人： Zhike Jia ,  Chi-Shin Wang ,  Lianxue Xiong ,  Hongyu Zhang

IPC分类号： G01S1/00 ,  G01S5/14 ,  G06F3/00

CPC分类号： G01S19/37

摘要： Provided herein is multi-function platform comprising a plurality of devices and a large memory that is external to the devices and shared among the devices. In an embodiment, a Direct Memory Access (DMA) controller is provided for each device to efficiently transfer data between the device and the shared memory. More than one DMA may be provided for a device. For example, separate DMAs may be provided for different components of a device that perform different subfunctions enabling efficient transfer of data between the different components of the device and the shared memory. In another embodiment, each device comprises a local embedded memory and is provided with a DMA for transferring data between the local memory and the shared memory. Examples of devices that can be included in the platform include a GNSS receiver, a audio player, a video player, a wireless communication device, a routing device, or the like.

摘要翻译： 本文提供的是包括多个设备的多功能平台和在设备外部并在设备之间共享的大型存储器。 在一个实施例中，为每个设备提供直接存储器访问（DMA）控制器以在设备和共享存储器之间有效地传输数据。 可以为设备提供多于一个的DMA。 例如，可以为执行不同子功能的设备的不同组件提供单独的DMA，从而能够在设备的不同组件和共享存储器之间有效地传输数据。 在另一个实施例中，每个设备包括本地嵌入式存储器，并且被提供有用于在本地存储器和共享存储器之间传送数据的DMA。 可以包括在平台中的设备的示例包括GNSS接收器，音频播放器，视频播放器，无线通信设备，路由设备等。

公开(公告)号：US07586382B2

公开(公告)日：2009-09-08

申请号：US11681568

申请日：2007-03-02

申请人： Chi-Shin Wang ,  Zhike Jia ,  Lianxue Xiong ,  Yinghao Tu

发明人： Chi-Shin Wang ,  Zhike Jia ,  Lianxue Xiong ,  Yinghao Tu

IPC分类号： G01C21/00 ,  H03L1/00

CPC分类号： G01S19/235 ,  H03J7/04 ,  H03L1/02

摘要： Systems and methods are provided that compensate for frequency drift due to temperature variation without the need for a temperature sensor. In one embodiment, a navigation receiver with an integrated communication device receives a base station reference signal, which is used to periodically calibrate a local oscillator frequency. In another embodiment, the calibrated local oscillator frequency drives a counter that is used to provide code phase estimation at the start of satellite signal acquisition. To provide temperature compensation in one embodiment, the calibrated local frequency is used to drive one or more counters at different calibration rates (i.e., different time intervals between calibrations). Count values from these counters are used to determine compensation for frequency drift due to temperature variation based on predicted frequency drift variation patterns between calibrations. This temperature compensation does not require a temperature sensor and further improves the accuracy of the code phase estimation.

摘要翻译： 提供了系统和方法，其补偿由于温度变化而引起的频率漂移，而不需要温度传感器。 在一个实施例中，具有集成通信设备的导航接收器接收用于周期性地校准本地振荡器频率的基站参考信号。 在另一个实施例中，校准的本地振荡器频率驱动用于在卫星信号采集开始时提供码相位估计的计数器。 为了在一个实施例中提供温度补偿，校准的本地频率用于以不同的校准速率驱动一个或多个计数器（即校准之间的不同时间间隔）。 这些计数器的计数值用于根据校准之间的预测频率漂移变化模式来确定由于温度变化引起的频率漂移的补偿。 该温度补偿不需要温度传感器，进一步提高了代码相位估计的精度。

公开(公告)号：US20080150797A1

公开(公告)日：2008-06-26

申请号：US11615431

申请日：2006-12-22

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

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

IPC分类号： G01S1/04 ,  G01S5/14

CPC分类号： G01S19/34 ,  G01S19/24

摘要： The present invention provides systems and methods for navigational signal tracking in low power mode to conserve the power of handheld navigation receivers. In an embodiment, the receiver cycles between sleep and wakeup states. During the sleep state, most of the components of the receiver are powered off to conserve power, and during the wakeup state, the receiver tracks navigational signals. In an embodiment, the duty cycle of the sleep/wakeup states depends on the receiver dynamic state, e.g., whether the receiver is accelerating. In another embodiment, during the wakeup state, the receiver selects a tracking mode based on the signal strength. Under weak signal conditions, a tracking mode using a long integration to track the satellite signal is disclosed. In one embodiment, a tracking mode tracks the navigation signal by performing data aided integration using known or predicted data bits, such as the TLM and HOW words.

摘要翻译： 本发明提供了用于低功率模式的导航信号跟踪的系统和方法，以节省手持式导航接收机的功率。 在一个实施例中，接收器在睡眠和唤醒状态之间循环。 在睡眠状态期间，接收机的大多数组件被断电以节省功率，并且在唤醒状态期间，接收机跟踪导航信号。 在一个实施例中，睡眠/唤醒状态的占空比取决于接收机的动态状态，例如接收机是否正在加速。 在另一个实施例中，在唤醒状态期间，接收机基于信号强度来选择跟踪模式。 在弱信号条件下，公开了使用长积分跟踪卫星信号的跟踪模式。 在一个实施例中，跟踪模式通过使用已知或预测的数据位（诸如TLM和HOW字）执行数据辅助积分来跟踪导航信号。

公开(公告)号：US20070248152A1

公开(公告)日：2007-10-25

申请号：US11379451

申请日：2006-04-20

申请人： Chi-Shin Wang ,  Yue Chen ,  Zhike Jia

发明人： Chi-Shin Wang ,  Yue Chen ,  Zhike Jia

IPC分类号： H04B1/00

CPC分类号： G01S19/24

摘要： Fast Fourier Transform (FFT) based Phase Lock Loops (PLLs) are provided for use in navigational signal receivers. In an embodiment, a navigation receiver correlates a received navigational signal with a locally generated signal into correlation samples, e.g., one-millisecond correlation samples. The navigation receiver includes a FFT based PLL that corrects phase shifts in the correlation samples due to the Doppler frequency by considering both the Doppler frequency and its rate of change, which are obtained from a FFT computation with interpolation. The phase corrected correlation samples are then integrated over a length of a navigation data bit, e.g., 20 milliseconds, to determine the sign of the data bit of the received signal. In another embodiment, a soft decision feedback technique involving integration extending over the present data bit and several prior data bits is used to determine the sign of a present data bit of the received signal.

摘要翻译： 基于快速傅里叶变换（FFT）的锁相环（PLL）被提供用于导航信号接收机。 在一个实施例中，导航接收器将接收到的导航信号与本地生成的信号相关联成相关样本，例如，一毫秒相关样本。 导航接收机包括基于FFT的PLL，其通过考虑从具有插值的FFT计算获得的多普勒频率及其变化率来校正由于多普勒频率引起的相关样本中的相移。 然后将相位校正的相关样本在导航数据位的长度（例如20毫秒）上积分，以确定接收信号的数据位的符号。 在另一个实施例中，使用涉及在当前数据位和若干先前数据位上延伸的积分的软判决反馈技术来确定接收信号的当前数据位的符号。

公开(公告)号：US07180446B2

公开(公告)日：2007-02-20

申请号：US11179353

申请日：2005-07-12

申请人： Chi-Shin Wang ,  Zhike Jia ,  Hansheng Wang

发明人： Chi-Shin Wang ,  Zhike Jia ,  Hansheng Wang

IPC分类号： G01S5/14

CPC分类号： G01S19/30

摘要： A method and device to acquire navigational satellite signals combines non-coherent and coherent integrations and can efficiently acquire both strong and weak signals. Successive steps eliminate lower powered and less likely combinations of code offsets and carrier frequencies or dwells of a given satellite signal. Only remaining dwells then are correlated and integrated over larger time duration to obtain the most probable dwell or dwells, which results in reduced computational load. The selection of most likely dwells is based on Parseval's theorem on equivalence of power in time and frequency domains. An optimal estimator algorithm efficiently estimates the probable navigation data bits embedded in the received signal. In case of an ambiguity due to several possible dwells, the steps are repeated with a new set of signal samples.

摘要翻译： 一种获取导航卫星信号的方法和装置组合了非相干和相干的整合，可以有效地获得强信号和弱信号。 相继的步骤消除了给定卫星信号的代码偏移和载波频率或驻留的较低功率和不太可能的组合。 然后，只有剩余的住宅在较大的持续时间内相关并整合，以获得最可能的停留或停留，这导致减少的计算负荷。 最可能的住宅选择是基于时间和频域功率等效的Parseval定理。 最优估计算法有效地估计嵌入在接收信号中的可能的导航数据位。 在由于几个可能的住宅而引起歧义的情况下，用新的一组信号样本重复这些步骤。