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：US20090167447A1

公开(公告)日：2009-07-02

申请号：US12331185

申请日：2008-12-09

申请人： Daniel Babitch

发明人： Daniel Babitch

IPC分类号： G05D23/20

CPC分类号： G01K7/32 ,  G01S19/235 ,  H03L1/026 ,  H03L1/04

摘要： A system and method for providing temperature compensation in a oscillator component (such as a crystal oscillator component) that includes a closely-located temperature sensing device. The crystal oscillator component in example systems and methods is exposed to a temperature profile during a calibration procedure. Temperature and frequency data are collected and applied to coefficient generating function according to a temperature compensation model to generate a set of coefficients that are used in the temperature compensation model in an application device. The generated coefficients are stored in a coefficient memory accessible to an application device during operation.

摘要翻译： 一种用于在包括紧密定位的温度感测装置的振荡器部件（例如晶体振荡器部件）中提供温度补偿的系统和方法。 示例系统和方法中的晶体振荡器组件在校准过程期间暴露于温度分布。 根据温度补偿模型收集温度和频率数据并将其应用于系数生成函数，以生成在应用设备中的温度补偿模型中使用的一组系数。 生成的系数存储在操作期间由应用设备可访问的系数存储器中。

公开(公告)号：US07555661B2

公开(公告)日：2009-06-30

申请号：US11381305

申请日：2006-05-02

申请人： Howard K. Luu

发明人： Howard K. Luu

IPC分类号： G06F1/32

CPC分类号： H04L27/2601 ,  H04L1/0045 ,  H04L1/0075 ,  H04L1/203 ,  H04N21/42607 ,  H04N21/4436

摘要： Methods and systems consistent with the present invention provide a method for dynamically controlling power consumption in a digital demodulator circuit by varying clock rates and bit widths of demodulator components including an analog to digital converter, decimation filter, OFDM operating engine, FEC decoder, and MPE-FEC processor, according to parameters and conditions of the received signal including modulation mode, signal to noise ratio, effective bit transmission rate, bit error rate, packet error rate, adjacent channel interference, and co-channel interference.

摘要翻译： 与本发明一致的方法和系统提供了一种用于通过改变包括模数转换器，抽取滤波器，OFDM操作引擎，FEC解码器和MPE的解调器组件的时钟速率和比特宽度来动态地控制数字解调器电路中的功耗的方法 -FEC处理器，根据接收信号的参数和条件，包括调制模式，信噪比，有效位传输速率，误码率，分组错误率，相邻信道干扰和同信道干扰。

公开(公告)号：US07545854B1

公开(公告)日：2009-06-09

申请号：US09498893

申请日：2000-02-07

申请人： Steven A. Gronemeyer

发明人： Steven A. Gronemeyer

IPC分类号： H04B1/00

CPC分类号： H04B1/7093 ,  H04L2027/0028 ,  H04L2027/0046

摘要： A method and apparatus for a spread spectrum matched filter with Doppler correction suitable for using in a radio frequency receiver. The system includes a signal sampler operable to receive signal data and a Doppler shift system operable to provide a Doppler shift correction value. The system also includes a time domain signal processor in signal communication with the signal sampler, the Doppler shift system and the code signal input, the time domain signal processor operable to shift the signal data by the Doppler shift correction value and to determine a correlation between the shifted signal data and the code signal input. The system reduces a waveform representing Doppler correction values into a Boolean combination that may selectively represent the waveform and be implemented by the processing of a matched filter.

摘要翻译： 一种用于具有适用于射频接收机中的多普勒校正的扩展频谱匹配滤波器的方法和装置。 该系统包括可操作以接收信号数据的信号采样器和可操作以提供多普勒频移校正值的多普勒频移系统。 该系统还包括与信号采样器，多普勒频移系统和码信号输入进行信号通信的时域信号处理器，时域信号处理器可操作以通过多普勒频移校正值移位信号数据，并确定 移位的信号数据和代码信号输入。 该系统将表示多普勒校正值的波形减少为可以选择性地表示波形并通过匹配滤波器的处理来实现的布尔组合。

公开(公告)号：US07545317B2

公开(公告)日：2009-06-09

申请号：US11558611

申请日：2006-11-10

申请人： Shaowei Han

发明人： Shaowei Han

IPC分类号： G01S1/00 ,  H03K9/00

CPC分类号： G01S19/252

摘要： The present invention provides systems and methods that enable a standalone receiver capable of downloading navigation data under weak signal conditions. In an embodiment, a standalone navigation receiver generates predicted satellite orbits based on the tracking history of the satellites stored in the receiver. The tracking history comprises historical navigation data previously received from the satellites. The receiver uses the predicted satellite orbit to generate navigation data such as ephemeris and almanac. Since the predicted satellite is accurate, the generated navigation data is similar to the navigation data transmitted by the navigation satellites, and can therefore be used by the receiver to correct the downloaded navigation data bits. Thus many of the bits of a downloaded navigation word, especially the higher order significant bits of the word can be corrected. The remaining bit errors can be resolved based on a parity check of the word.

摘要翻译： 本发明提供了能够在弱信号条件下能够下载导航数据的独立接收机的系统和方法。 在一个实施例中，独立导航接收机基于存储在接收机中的卫星的跟踪历史来生成预测的卫星轨道。 跟踪历史包括先前从卫星接收的历史导航数据。 接收机使用预测的卫星轨道来生成导航数据，如星历和年历。 由于预测的卫星是准确的，因此所生成的导航数据与由导航卫星发送的导航数据相似，因此可由接收机使用以校正下载的导航数据比特。 因此，可以校正下载的导航字的许多位，特别是该字的高阶有效位。 可以基于字的奇偶校验来解决剩余的位错误。

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。

公开(公告)号：US07418066B2

公开(公告)日：2008-08-26

申请号：US11053573

申请日：2005-02-07

申请人： Scott Bloebaum ,  Andrew Chou ,  Benjamin Van Roy

发明人： Scott Bloebaum ,  Andrew Chou ,  Benjamin Van Roy

IPC分类号： H03K5/01

CPC分类号： H04B1/7102 ,  G01S5/0036 ,  G01S19/25 ,  G01S19/29 ,  G01S19/37 ,  H04B2201/70715

摘要： A multi-function device with a positioning function and a real time positioning engine is disclosed. The device contains also a shared processor used by the positioning function and other functions of the device, such as a mobile radio-communication function. The positioning engine performs in real time the most computational intensive calculations of the positioning function, such as downsampling, Doppler mixing and correlation calculations. Since the received signal need not be stored, the memory requirements of the positioning function are significantly reduced if aiding data is available.

公开(公告)号：US07408505B2

公开(公告)日：2008-08-05

申请号：US11692699

申请日：2007-03-28

申请人： Scott Bloebaum ,  Andrew Chou ,  Benjamin Van Roy

发明人： Scott Bloebaum ,  Andrew Chou ,  Benjamin Van Roy

IPC分类号： G01S5/14 ,  H04B1/707

CPC分类号： H04B1/7102 ,  G01S5/0036 ,  G01S19/25 ,  G01S19/29 ,  G01S19/37 ,  H04B2201/70715

摘要： A multi-function device with a positioning function and a real time positioning engine is disclosed. The device contains also a shared processor used by the positioning function and other functions of the device, such as a mobile radio-communication function. The positioning engine performs in real time the most computational intensive calculations of the positioning function, such as downsampling, Doppler mixing and correlation calculations. Since the received signal need not be stored, the memory requirements of the positioning function are significantly reduced if aiding data is available.

摘要翻译： 公开了具有定位功能的多功能装置和实时定位引擎。 该设备还包括由定位功能和设备的其他功能（例如移动无线电通信功能）使用的共享处理器。 定位引擎实时执行定位功能的最大计算密集型计算，例如下采样，多普勒混合和相关计算。 由于接收到的信号不需要存储，所以如果有帮助数据可用，定位功能的存储器要求会大大降低。

公开(公告)号：US07388939B2

公开(公告)日：2008-06-17

申请号：US10494322

申请日：2002-10-31

申请人： Noshir Behli Dubash ,  Robert Tso

发明人： Noshir Behli Dubash ,  Robert Tso

IPC分类号： H03D3/24

CPC分类号： G06F7/68 ,  H03L7/0995 ,  H03L7/0996 ,  H03L7/1806 ,  H03L7/1976

摘要： A fractional-R synthesizer having a divider with rational increments and configurable in rational steps able to generate a plurality of frequencies in rational increments from a reference frequency. A voltage-controlled oscillator frequency (fVCO) is related to the reference frequency (fREF) by: fREF=fVCO/RAVG, where RAVG is the average value of the rational divide value “R” over a large number of reference cycles.

摘要翻译： 分数R合成器具有具有合理增量的分频器，并且可以在合理步骤中配置，能够以合理的增量从参考频率产生多个频率。 压控振荡器频率（f VCO）通过以下方式与参考频率（f REF REF）进行相关：f REF =＆lt; 其中，R AVG 是大量参考循环的合理分频值“R”的平均值。

公开(公告)号：US07355535B1

公开(公告)日：2008-04-08

申请号：US11560687

申请日：2006-11-16

申请人： Erik Anderson ,  Paul Eric Beckman ,  William Kerry Keal

发明人： Erik Anderson ,  Paul Eric Beckman ,  William Kerry Keal

IPC分类号： H03M7/00

CPC分类号： G01S19/24 ,  G01S19/37

摘要： Methods and devices for processing GPS signals are provided. The device includes: means for storing one or more lookup tables, each lookup table comprising a plurality of entries, each entry comprising an input segment and an output segment, wherein the output segment is a system response to the corresponding input segment; and processing means for receiving an input data sequence comprising one or more input segments, and for each of the input segments, retrieve from one of the lookup tables the output segments corresponding to the input segment, wherein the processing means is further configured to perform a time-shifted sum of one or more output segments to produce an output sequence that is a downsampled representation of the input data sequence.

摘要翻译： 提供了处理GPS信号的方法和装置。 该设备包括：用于存储一个或多个查找表的装置，每个查找表包括多个条目，每个条目包括输入段和输出段，其中输出段是对相应输入段的系统响应; 以及处理装置，用于接收包括一个或多个输入段的输入数据序列，并且对于每个输入段，从查找表中的一个检索与输入段相对应的输出段，其中处理装置还被配置为执行 一个或多个输出段的时移和，以产生作为输入数据序列的下采样表示的输出序列。