公开(公告)号：US08094758B2

公开(公告)日：2012-01-10

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： H04B1/00

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：US08086405B2

公开(公告)日：2011-12-27

申请号：US11823964

申请日：2007-06-28

申请人： Shaowei Han ,  Xiaoji Niu ,  Changlin Ma

发明人： Shaowei Han ,  Xiaoji Niu ,  Changlin Ma

IPC分类号： G01C21/00

CPC分类号： G01C21/16 ,  G01C21/265 ,  G01C21/28

摘要： Compensating for the misalignment of a navigation device with respect to a vehicle is described. In one example, the compensation is made by applying a high pass filter to a measured acceleration of the vehicle to produce a motion acceleration signal, weighting the motion acceleration signal with a measured steering rate of the vehicle, and deriving misalignment parameters for the navigation device with respect to the vehicle using the weighted motion acceleration signal.

摘要翻译： 描述了导航装置相对​​于车辆的不对准的补偿。 在一个示例中，通过对车辆的测量加速度应用高通滤波器来产生运动加速度信号，以车辆的测量转向速率对运动加速度信号加权，以及导出导航装置的未对准参数来进行补偿 相对于使用加权运动加速度信号的车辆。

公开(公告)号：US20110193742A1

公开(公告)日：2011-08-11

申请号：US13083498

申请日：2011-04-08

申请人： Gary Lennen ,  Makarand Phatak ,  William Kerry Keal

发明人： Gary Lennen ,  Makarand Phatak ,  William Kerry Keal

IPC分类号： G01S19/42 ,  G01S19/27 ,  H04L7/00

CPC分类号： G01S19/24 ,  G01S19/27

摘要： The present invention is related to location positioning systems, and more particularly, to a method and apparatus of synchronizing to data frames in a positioning system signal. According to one aspect, the invention speeds up the frame synchronization process by computing a frame synchronization metric for each satellite and then combining together the metrics for all tracked satellites together, after compensating for respective signal transit times. Then the invention makes a frame sync decision on the combined satellite metric. In embodiments, an optimal combining algorithm is used based on CNO of each satellite. According to further aspects, the invention further speeds up the frame synchronization process by predicting many bits in the subframe so that more bits are known in addition to the 8-bit preamble. For example, the invention recognizes that many bits in a subframe rarely change or don't change very often. Moreover, the invention uses old ephemeris used to predict new ephemeris parameters. These parameters are translated into predicted bits in the signal. Still further, old ephemeris can be used to predict almanac parameters, and the almanac can be used to predict ephemeris parameters.

摘要翻译： 本发明涉及位置定位系统，更具体地说，涉及一种与定位系统信号中的数据帧同步的方法和装置。 根据一个方面，本发明通过计算每个卫星的帧同步度量来加速帧同步过程，然后在补偿相应的信号传送时间之后将所有跟踪的卫星的度量组合在一起。 然后，本发明对组合的卫星度量做出帧同步决定。 在实施例中，基于每个卫星的CNO使用最佳组合算法。 根据另外的方面，本发明通过预测子帧中的多个比特来进一步加速帧同步过程，以便除了8比特前同步码之外还有更多比特是已知的。 例如，本发明认识到，子帧中的许多位很少改变或者不经常地改变。 此外，本发明使用用于预测新星历参数的旧星历。 这些参数被转换成信号中的预测位。 此外，旧星历可用于预测年历参数，历书可用于预测星历参数。

公开(公告)号：US07924220B1

公开(公告)日：2011-04-12

申请号：US12277044

申请日：2008-11-24

申请人： Gary Lennen ,  Makarand Phatak ,  William Kerry Keal

发明人： Gary Lennen ,  Makarand Phatak ,  William Kerry Keal

IPC分类号： G01S19/48 ,  H04B1/00

CPC分类号： G01S19/24 ,  G01S19/27

摘要： The present invention is related to location positioning systems, and more particularly, to a method and apparatus of synchronizing to data frames in a positioning system signal. According to one aspect, the invention speeds up the frame synchronization process by computing a frame synchronization metric for each satellite and then combining together the metrics for all tracked satellites together, after compensating for respective signal transit times. Then the invention makes a frame sync decision on the combined satellite metric. In embodiments, an optimal combining algorithm is used based on CNO of each satellite. According to further aspects, the invention further speeds up the frame synchronization process by predicting many bits in the subframe so that more bits are known in addition to the 8-bit preamble. For example, the invention recognizes that many bits in a subframe rarely change or don't change very often. Moreover, the invention uses old ephemeris used to predict new ephemeris parameters. These parameters are translated into predicted bits in the signal. Still further, old ephemeris can be used to predict almanac parameters, and the almanac can be used to predict ephemeris parameters.

摘要翻译： 本发明涉及位置定位系统，更具体地说，涉及一种与定位系统信号中的数据帧同步的方法和装置。 根据一个方面，本发明通过计算每个卫星的帧同步度量来加速帧同步过程，然后在补偿相应的信号传送时间之后将所有跟踪的卫星的度量组合在一起。 然后，本发明对组合的卫星度量做出帧同步决定。 在实施例中，基于每个卫星的CNO使用最佳组合算法。 根据另外的方面，本发明通过预测子帧中的多个比特来进一步加速帧同步过程，以便除了8比特前同步码之外还有更多比特是已知的。 例如，本发明认识到，子帧中的许多位很少改变或者不经常地改变。 此外，本发明使用用于预测新星历参数的旧星历。 这些参数被转换成信号中的预测位。 此外，旧星历可用于预测年历参数，历书可用于预测星历参数。

公开(公告)号：US07778311B2

公开(公告)日：2010-08-17

申请号：US11244305

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

CPC分类号： G01S19/30 ,  G01S19/24

摘要： Methods to achieve data bit synchronization from weak navigational satellite signals are based on a maximum likelihood criterion. The bit synchronization technique may be implemented by calculating a normalized dot product of two consecutive one-millisecond correlation values. Similar normalized dot products are calculated at intervals separated by one bit duration, and these dot products are summed and compared with pre-computed thresholds to declare bit edge detection. In another implementation, the normalized dot product of adjacent correlation values is replaced by a coherent integration powers of adjacent correlation values.

摘要翻译： 从弱导航卫星信号实现数据位同步的方法是基于最大似然准则。 比特同步技术可以通过计算两个连续的1毫秒相关值的归一化点积来实现。 以间隔一位持续时间的间隔计算相似的归一化点积，并将这些点积相加并与预先计算的阈值进行比较以声明位边缘检测。 在另一实现中，相邻相关值的归一化积积由相邻相关值的相干积分能量代替。

公开(公告)号：US07573422B2

公开(公告)日：2009-08-11

申请号：US10489525

申请日：2002-09-14

申请人： Robert Shaw Harvey ,  Gengsheng Zhang ,  Lionel J. Garin ,  Wendell Edwin Innis ,  Stefan Witanis

发明人： Robert Shaw Harvey ,  Gengsheng Zhang ,  Lionel J. Garin ,  Wendell Edwin Innis ,  Stefan Witanis

IPC分类号： G01S5/14 ,  H04B1/16 ,  G06F1/32

CPC分类号： G01S19/34

摘要： A power management system for managing power in a wireless device having a SPS receiver, communication device and a power source, the power management is described. The power management system may include a real-time clock, an input/output device, a radio frequency front-end and a SPS engine in signal communication with the real-time clock, input/output device and radio frequency front-end, the SPS engine capable of powering down itself, the input/output device and radio frequency front-end in response to determining a mode of operation.

摘要翻译： 一种用于在具有SPS接收机，通信设备和电源的无线设备中管理电力的电源管理系统，描述了电源管理。 电源管理系统可以包括与实时时钟，输入/输出设备和射频前端进行信号通信的实时时钟，输入/输出设备，射频前端和SPS引擎， 响应于确定操作模式，能够自己断电的SPS引擎，输入/输出设备和射频前端。

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。

公开(公告)号：US07639181B2

公开(公告)日：2009-12-29

申请号：US11618131

申请日：2006-12-29

申请人： Chun Wang ,  Shaowei Han

发明人： Chun Wang ,  Shaowei Han

IPC分类号： H01S1/00

CPC分类号： G01S19/24 ,  G01S19/29 ,  G01S19/37

摘要： A Global Navigation Satellite System (GNSS) receiver and associated method capable of tracking weak GNSS signals from a plurality of GNSS satellites. In a preferred embodiment, code and carrier tracking loops are initially closed around the code phase, carrier frequency, and data bit edge estimates handed over from an acquisition mode. In subsequent tracking, early, prompt, and late copies of the code replica are correlated with the incoming signal. The prompt correlations are coherently integrated over an extended updating interval for data bit edge and sign estimation as well as for carrier phase and frequency error discrimination whereas the early and late correlations are used for code error discrimination. Code delay and carrier phase and frequency errors are used to update the code and carrier tracking loop filters. Together with data bits, they form observables of a GNSS signal's time and frequency parameters for timing and position fixing.

摘要翻译： 一种能够跟踪来自多个GNSS卫星的弱GNSS信号的全球导航卫星系统（GNSS）接收机和相关方法。 在优选实施例中，代码和载波跟踪循环首先围绕从采集模式切换的码相位，载波频率和数据比特边缘估计值闭合。 在随后的跟踪中，代码副本的早期，及时和晚期副本与输入信号相关。 对于数据位边沿和符号估计以及载波相位和频率误差鉴别的延迟更新间隔，快速相关被相干地集成，而早期和晚期相关用于码错误鉴别。 代码延迟和载波相位和频率误差用于更新代码和载波跟踪环路滤波器。 与数据位一起，它们形成GNSS信号的时间和频率参数的观测值，用于定时和位置固定。

公开(公告)号：US07616705B1

公开(公告)日：2009-11-10

申请号：US09916087

申请日：2001-07-26

申请人： Robert Tso ,  Richard Joseph McConnell

发明人： Robert Tso ,  Richard Joseph McConnell

IPC分类号： H03K9/00 ,  H04L27/00

CPC分类号： H04L27/36 ,  G01S19/36 ,  H03L7/0891 ,  H03L7/18 ,  H03L2207/10

摘要： A highly integrated GPS RF Front End, an interface thereto, and a GPS receiver that incorporates the GPS RF front end, which uses a single conversion stage employing an image rejection mixer stage to eliminate the need for an image reject RF bandpass filter. Also a relatively high sample rate A/D is employed which allows a timeless monolithic IF Filter to be used. The disclosure also discusses a GPS Front End topology that is easily integrated from industry standard building blocks. With the broad variation in potential receiver designs, the present invention includes some specific receiver topologies that lend themselves to a high level of integration. The specific designs presented here are comprised of industry standard building blocks and functions that have been described elsewhere in the related art.

摘要翻译： 高度集成的GPS RF前端，其接口和包含GPS RF前端的GPS接收器，其使用采用镜像抑制混频器级的单个转换级以消除对图像抑制RF带通滤波器的需要。 还采用相对高的采样率A / D，其允许使用永恒的单片IF滤波器。 本公开还讨论了可从工业标准构建块轻松集成的GPS前端拓扑。 随着潜在接收器设计的广泛变化，本发明包括一些具有高度集成度的特定接收器拓扑。 这里提出的具体设计包括在现有技术的其他地方描述的工业标准构建块和功能。

公开(公告)号：US07577448B2

公开(公告)日：2009-08-18

申请号：US10194627

申请日：2002-07-12

申请人： Ashutosh Pande ,  Lionel Jacques Garin ,  Kanwar Chadha ,  Gregory Bret Turetzky

发明人： Ashutosh Pande ,  Lionel Jacques Garin ,  Kanwar Chadha ,  Gregory Bret Turetzky

IPC分类号： H04W24/00

CPC分类号： H04W64/00 ,  G01S5/0009 ,  G01S19/05 ,  G01S19/09 ,  G01S19/235 ,  G01S19/25 ,  G01S19/48

摘要： The present invention discloses a GPS system that can operate in different modes depending on the network facilities and bandwidth available, the GPS information that can be acquired, or user or system requirements. The modes comprise standalone mode, where a mobile communications device computes the position of the device, an autonomous mode, where the mobile communications device transmits the computed position to a server, application, or PSAP in a communications network, a network aided mode, where the network aides the mobile communications device in determining the position of the device, a network based mode, and other modes.