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。

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。

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。

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。

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。

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。

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。