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    Continuous integration based satellite navigational signal acquisition
    7.
    发明授权
    Continuous integration based satellite navigational signal acquisition 有权
    基于连续集成的卫星导航信号采集

    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。

    Efficient and flexible GPS receiver baseband architecture
    8.
    发明申请
    Efficient and flexible GPS receiver baseband architecture 有权
    高效灵活的GPS接收机基带架构

    公开(公告)号：US20060251173A1

    公开(公告)日：2006-11-09

    申请号：US11123861

    申请日：2005-05-06

    申请人： Hansheng Wang ,  Chi-Shin Wang

    发明人： Hansheng Wang ,  Chi-Shin Wang

    IPC分类号： H04N11/04

    CPC分类号： G01S19/37 ,  G01S19/235

    摘要： The present invention provides a new baseband integrated circuit (IC) architecture for direct sequence spread spectrum (DSSS) communication receivers. The baseband IC has a single set of baseband correlators serving all channels in succession. No complex parallel channel hardware is required. A single on-chip code Numerically Controlled Oscillator (NCO) drives a pseudorandom number (PN) sequence generator, generates all code sampling frequencies, and is capable of self-correct through feedback from an off-chip processor. A carrier NCO generates corrected local frequencies. These on-chip NCOs generate all the necessary clocks. This architecture advantageously reduces the total hardware necessary for the receiver and the baseband IC thus can be realized with a minimal number of gate count. The invention can accommodate any number of channels in a navigational system such as the Global Positioning System (GPS), GLONASS, WAAS, LAAS, etc. The number of channels can be increased by increasing the circuit clock speed.

    摘要翻译： 本发明提供了一种用于直接序列扩频（DSSS）通信接收机的新的基带集成电路（IC）架构。 基带IC具有一组基带相关器，连续地为所有通道服务。 不需要复杂的并行通道硬件。 单个片上代码数控振荡器（NCO）驱动伪随机数（PN）序列发生器，产生所有代码采样频率，并且能够通过来自片外处理器的反馈进行自校正。 载波NCO产生校正的本地频率。 这些片上NCO产生所有必要的时钟。 该架构有利地减少了接收机和基带IC所需的总硬件，因此可以以最小数量的门数实现。 本发明可以容纳诸如全球定位系统（GPS），GLONASS，WAAS，LAAS等导航系统中的任何数量的信道。可以通过增加电路时钟速度来增加信道数量。

    Method and apparatus for self-calibration and adaptive temperature compensation in GPS receivers
    9.
    发明授权
    Method and apparatus for self-calibration and adaptive temperature compensation in GPS receivers 有权
    GPS接收机中自校准和自适应温度补偿的方法和装置

    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。

    CONTINUOUS INTEGRATION BASED SATELLITE NAVIGATIONAL SIGNAL ACQUISITION
    10.
    发明申请
    CONTINUOUS INTEGRATION BASED SATELLITE NAVIGATIONAL SIGNAL ACQUISITION 有权
    基于连续集成的卫星导航信号采集

    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。