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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。

3. 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。

4. 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。

5. 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。

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