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：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。

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。

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：US20090002227A1

公开(公告)日：2009-01-01

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

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：US20080198070A1

公开(公告)日：2008-08-21

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 ,  G01S1/00

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：US20070230543A1

公开(公告)日：2007-10-04

申请号：US11244436

申请日：2005-10-04

申请人： Zhike Jia ,  Chi-Shin Wang

发明人： Zhike Jia ,  Chi-Shin Wang

IPC分类号： H04B1/00 ,  H04L27/06

CPC分类号： H04B1/7077 ,  G01S19/24 ,  G01S19/243 ,  G01S19/246 ,  H04B2201/70715

摘要： A method to determine the polarity of navigation data from weak satellite signals is disclosed. After bit edge is detected, a method in frequency domain is used to determine the present bit polarity with the help of several prior data bits which are already known, is disclosed. The impact of residual frequency can be mitigated by frequency transform. This method is especially useful in removing the data modulation in the weak signal for subsequent long coherent integrations.

摘要翻译： 公开了一种从弱卫星信号确定导航数据极性的方法。 在检测到位边沿之后，使用频域中的方法来借助已知的几个先前的数据位来确定当前的位极性。 残余频率的影响可以通过频率变换来缓解。 该方法在去除弱信号中的数据调制方面特别有用，用于随后的长相干积分。

公开(公告)号：US20100328145A1

公开(公告)日：2010-12-30

申请号：US11612426

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： G01S19/41

CPC分类号： G01S19/13 ,  G01S19/24

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。

公开(公告)号：US07847726B2

公开(公告)日：2010-12-07

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： G01S1/00

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关闭以节省功率，并且在唤醒状态期间，接收器跟踪导航信号。 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：US07456782B2

公开(公告)日：2008-11-25

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。