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1. 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。

2. 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。

3. 发明申请

US20080180321A1 METHODS AND SYSTEMS FOR ACQUISITION, REACQUISITION AND TRACKING OF WEAK NAVIGATIONAL SIGNALS 有权
标题翻译：弱导航信号的获取，反应和跟踪的方法和系统
公开(公告)号：US20080180321A1
公开(公告)日：2008-07-31
申请号：US11694786
申请日：2007-03-30
申请人： Chi-Shin Wang , Zhike Jia , Yue-Meng Chen , Jian Cheng , EnYuan Tu
发明人： Chi-Shin Wang , Zhike Jia , Yue-Meng Chen , Jian Cheng , EnYuan Tu
IPC分类号： G01S5/14 , G01S1/04
CPC分类号： H04B1/7075 , G01S19/235 , G01S19/29
摘要： Provided herein are systems and methods for achieving long coherent integration in a navigational receiver to improve the sensitivity of the receiver and enable the receiver to acquire, reacquire and track signals under very weak signal conditions. In an embodiment, phase compensation is computed based on estimated Doppler frequency, rate of change of the Doppler frequency with time, and second order rate of change of the Doppler frequency. The Doppler frequency may be computed from an orbital model or ephemeris. This phase compensation is used to compensate samples of the input signal for changes in the phase due to the Doppler frequency. Frequency components of the phase-compensated samples are then computed using a frequency analysis such as a Fast Fourier Transform (FFT). The maximum frequency component is taken as an error frequency and used to compensate the samples of the input signal for residual frequency error.
摘要翻译：本文提供了用于在导航接收机中实现长相干集成以提高接收机的灵敏度并使接收机能够在非常弱的信号条件下获取，重新获取和跟踪信号的系统和方法。在一个实施例中，基于估计的多普勒频率，多普勒频率随时间的变化率和多普勒频率的二阶变化率来计算相位补偿。多普勒频率可以从轨道模型或星历计算。该相位补偿用于补偿由于多普勒频率引起的相位变化的输入信号的样本。然后使用诸如快速傅立叶变换（FFT）的频率分析来计算相位补偿样本的频率分量。将最大频率分量作为误差频率，用于补偿输入信号的样本以获得残余频率误差。

4. 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。

5. 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。

6. 发明授权

US07477189B2 Methods and systems for acquisition, reacquisiton and tracking of weak navigational signals 有权
标题翻译：弱导航信号的采集，重新获取和跟踪的方法和系统
公开(公告)号：US07477189B2
公开(公告)日：2009-01-13
申请号：US11694786
申请日：2007-03-30
申请人： Chi-Shin Wang , Zhike Jia , Yue-Meng Chen , Jian Cheng , EnYuan Tu
发明人： Chi-Shin Wang , Zhike Jia , Yue-Meng Chen , Jian Cheng , EnYuan Tu
IPC分类号： G01S5/14 , G01S1/04
CPC分类号： H04B1/7075 , G01S19/235 , G01S19/29
摘要： Provided herein are systems and methods for achieving long coherent integration in a navigational receiver to improve the sensitivity of the receiver and enable the receiver to acquire, reacquire and track signals under very weak signal conditions. In an embodiment, phase compensation is computed based on estimated Doppler frequency, rate of change of the Doppler frequency with time, and second order rate of change of the Doppler frequency. The Doppler frequency may be computed from an orbital model or ephemeris. This phase compensation is used to compensate samples of the input signal for changes in the phase due to the Doppler frequency. Frequency components of the phase-compensated samples are then computed using a frequency analysis such as a Fast Fourier Transform (FFT). The maximum frequency component is taken as an error frequency and used to compensate the samples of the input signal for residual frequency error.
摘要翻译：本文提供了用于在导航接收机中实现长相干集成以提高接收机的灵敏度并使接收机能够在非常弱的信号条件下获取，重新获取和跟踪信号的系统和方法。在一个实施例中，基于估计的多普勒频率，多普勒频率随时间的变化率和多普勒频率的二阶变化率来计算相位补偿。多普勒频率可以从轨道模型或星历计算。该相位补偿用于补偿由于多普勒频率引起的相位变化的输入信号的样本。然后使用诸如快速傅立叶变换（FFT）的频率分析来计算相位补偿样本的频率分量。将最大频率分量作为误差频率，用于补偿输入信号的样本以获得残余频率误差。

7. 发明授权

US07693211B2 Fast fourier transform based phase locked loop for navigational receivers 失效
标题翻译：用于导航接收机的快速傅里叶变换基于锁相环
公开(公告)号：US07693211B2
公开(公告)日：2010-04-06
申请号：US11379451
申请日：2006-04-20
申请人： Chi-Shin Wang , Yue Meng Chen , Zhike Jia
发明人： Chi-Shin Wang , Yue Meng Chen , Zhike Jia
IPC分类号： H04B1/00
CPC分类号： G01S19/24
摘要： Fast Fourier Transform (FFT) based Phase Lock Loops (PLLs) are provided for use in navigational signal receivers. In an embodiment, a navigation receiver correlates a received navigational signal with a locally generated signal into correlation samples, e.g., one-millisecond correlation samples. The navigation receiver includes a FFT based PLL that corrects phase shifts in the correlation samples due to the Doppler frequency by considering both the Doppler frequency and its rate of change, which are obtained from a FFT computation with interpolation. The phase corrected correlation samples are then integrated over a length of a navigation data bit, e.g., 20 milliseconds, to determine the sign of the data bit of the received signal. In another embodiment, a soft decision feedback technique involving integration extending over the present data bit and several prior data bits is used to determine the sign of a present data bit of the received signal.
摘要翻译：基于快速傅里叶变换（FFT）的锁相环（PLL）被提供用于导航信号接收机。在一个实施例中，导航接收器将接收到的导航信号与本地生成的信号相关联成相关样本，例如，一毫秒相关样本。导航接收机包括基于FFT的PLL，其通过考虑从具有插值的FFT计算获得的多普勒频率及其变化率来校正由于多普勒频率引起的相关样本中的相移。然后将相位校正的相关样本在导航数据位的长度（例如20毫秒）上积分，以确定接收信号的数据位的符号。在另一个实施例中，使用涉及在当前数据位和若干先前数据位上延伸的积分的软判决反馈技术来确定接收信号的当前数据位的符号。

8. 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。

9. 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。

10. 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。

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