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21. 发明授权

US4171521A Charge-coupled analog-to-digital converter 失效
标题翻译：电荷耦合模数转换器
公开(公告)号：US4171521A
公开(公告)日：1979-10-16
申请号：US802835
申请日：1977-06-02
申请人： Chi-Shin Wang , Ching-Lin Jiang
发明人： Chi-Shin Wang , Ching-Lin Jiang
IPC分类号： H03M1/00 , H03K13/03
CPC分类号： H03M1/442
摘要： Analog-to-digital conversion through successive approximation is implemented by means of a charge coupled device. During the conversion process two charges are compared, each comparison yielding one bit of a multi-bit number. By increasing the lesser of the compared charges after each comparison, the need to subtract charge as part of the successive approximation process is eliminated.
摘要翻译：通过逐次逼近的模数转换通过电荷耦合器件实现。在转换过程中，比较两个电荷，每个比较产生一个多位数的一位。通过在每次比较之后增加较小的比较电荷，消除了作为逐次逼近处理的一部分的电荷减去的需要。

22. 发明授权

US08094758B2 Ephemeris download from weak signals 有权
标题翻译：短信从弱信号下载
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。

23. 发明授权

US07778311B2 Bit synchronization for weak navigational satellite signals 有权
标题翻译：弱导航卫星信号的位同步
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。

24. 发明申请

US20090168851A1 A CORRELATOR SUM METHOD FOR SPREAD SPECTRUM SIGNAL RECEIVERS 有权
标题翻译：用于传播频谱信号接收机的相关方法
公开(公告)号：US20090168851A1
公开(公告)日：2009-07-02
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： H04B1/707
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Prompt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。

25. 发明授权

US07459984B2 Method and apparatus for self-calibration and adaptive temperature compensation in GPS receivers 有权
标题翻译： 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。

26. 发明申请

US20080143594A1 Ephemeris Download From Weak Signals 有权
标题翻译：短信从弱信号下载
公开(公告)号：US20080143594A1
公开(公告)日：2008-06-19
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： H04B7/185
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。

27. 发明申请

US20070152876A1 Timing calibration for fast signal reacquisition in navigational receivers 有权
标题翻译：导航接收机快速信号重新采集的定时校准
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。

28. 发明申请

US20070109189A1 False reacquisition mitigation in high sensitivity navigational satellite signal receivers 有权
标题翻译：高灵敏度导航卫星信号接收机中的虚拟反馈缓解
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。

29. 发明申请

US20070013583A1 CONTINUOUS INTEGRATION BASED SATELLITE NAVIGATIONAL SIGNAL ACQUISITION 有权
标题翻译：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。

30. 发明申请

US20100328145A1 Ephemeris Download From Weak Signals 有权
标题翻译：短信从弱信号下载
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。

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