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1. 发明授权

US08466836B2 Fast fourier transform with down sampling based navigational satellite signal tracking 有权
标题翻译：快速傅里叶变换与基于下采样的导航卫星信号跟踪
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。

2. 发明授权

US07903028B2 Ephemeris download from weak signals 有权
标题翻译：短信从弱信号下载
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。

3. 发明授权

US07859456B2 Method of mixed data assisted and non data assisted navigation signal acquisition, tracking and reacquisition 有权
标题翻译：混合数据辅助和非数据辅助导航信号采集，跟踪和重新采集的方法
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。

4. 发明申请

US20090002227A1 HIGH SENSITIVITY GNSS RECEIVER PLATFORM WITH SHARED MEMORY 有权
标题翻译：具有共享存储器的高灵敏度GNSS接收机平台
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。

5. 发明申请

US20080198070A1 METHODS AND SYSTEMS FOR TEMPERATURE RELATED FREQUENCY DRIFT COMPENSATION 有权
标题翻译：温度相关频率补偿补偿方法与系统
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。

6. 发明申请

US20070230543A1 Data demodulation from weak navigational satellite signals 有权
标题翻译：弱导航卫星信号的数据解调
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。

7. 发明授权

US07660373B2 Data demodulation from weak navigational satellite signals 有权
标题翻译：弱导航卫星信号的数据解调
公开(公告)号：US07660373B2
公开(公告)日：2010-02-09
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： 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。

8. 发明授权

US07479924B2 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：US07479924B2
公开(公告)日：2009-01-20
申请号：US11274054
申请日：2005-11-14
申请人： Zhike Jia , Shridhara A. Kudrethaya , Chi-Shin Wang
发明人： Zhike Jia , Shridhara A. Kudrethaya , Chi-Shin Wang
IPC分类号： G01S1/00 , H04B1/00
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。

9. 发明申请

US20070076788A1 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：US20070076788A1
公开(公告)日：2007-04-05
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。

10. 发明申请

US20070046536A1 Fast fourier transform with down sampling based navigational satellite signal tracking 有权
标题翻译：快速傅里叶变换与基于下采样的导航卫星信号跟踪
公开(公告)号：US20070046536A1
公开(公告)日：2007-03-01
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： G01S5/14 , H04B1/707
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。

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