公开(公告)号：US20140159950A1

公开(公告)日：2014-06-12

申请号：US13710154

申请日：2012-12-10

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Atul Deshpande ,  Sthanunathan Ramakrishnan ,  Sandeep Rao

IPC: G01S19/40

CPC classification number: G01S19/40 ,  G01S5/0294 ,  G01S19/22 ,  G01S19/49

Abstract: A Global Navigation Satellite System (GNSS) receiver determines a measurement error covariance from a reference position and a set of measured pseudoranges from a set of GNSS satellites. The position and velocity solution is determined from the measurement error covariance and the set of measured pseudoranges. The measurement error covariance is determined as function of the difference between a reference pseudorange and measured pseudorange. The reference pseudorange is computed from the reference position to a satellite. The measurement error covariance is determined as function of the difference only if the measured pseudorange is greater than the reference pseudorange. The GNSS receiver also determines measurement error covariance as function of one or more of correlation peak shape, difference, the correlation peak shape, a received signal to noise ratio and a tracking loop error.

Abstract translation: 全球导航卫星系统（GNSS）接收机从一组GNSS卫星确定来自参考位置和一组测量伪距的测量误差协方差。 位置和速度解是从测量误差协方差和测量伪距的集合确定的。 测量误差协方差被确定为参考伪距和测量伪距之间的差的函数。 从参考位置到卫星计算参考伪距。 仅当所测量的伪距大于参考伪距时，测量误差协方差才被确定为差值的函数。 GNSS接收机还将测量误差协方差确定为相关峰形，差，相关峰形，接收信噪比和跟踪循环误差中的一个或多个的函数。

公开(公告)号：US09513374B2

公开(公告)日：2016-12-06

申请号：US13710154

申请日：2012-12-10

Applicant: Texas Instruments Incorporated

Inventor： Atul Deshpande ,  Sthanunathan Ramakrishnan ,  Sandeep Rao

IPC: G01S19/40 ,  G01S19/22 ,  G01S19/49 ,  G01S5/02

CPC classification number: G01S19/40 ,  G01S5/0294 ,  G01S19/22 ,  G01S19/49

Abstract: A Global Navigation Satellite System (GNSS) receiver determines a measurement error covariance from a reference position and a set of measured pseudoranges from a set of GNSS satellites. The position and velocity solution is determined from the measurement error covariance and the set of measured pseudoranges. The measurement error covariance is determined as function of the difference between a reference pseudorange and measured pseudorange. The reference pseudorange is computed from the reference position to a satellite. The measurement error covariance is determined as function of the difference only if the measured pseudorange is greater than the reference pseudorange. The GNSS receiver also determines measurement error covariance as function of one or more of correlation peak shape, difference, the correlation peak shape, a received signal to noise ratio and a tracking loop error.

Abstract translation: 全球导航卫星系统（GNSS）接收机从一组GNSS卫星确定来自参考位置和一组测量伪距的测量误差协方差。 位置和速度解是从测量误差协方差和测量伪距的集合确定的。 测量误差协方差被确定为参考伪距和测量伪距之间的差的函数。 从参考位置到卫星计算参考伪距。 仅当所测量的伪距大于参考伪距时，测量误差协方差才被确定为差值的函数。 GNSS接收机还将测量误差协方差确定为相关峰形，差，相关峰形，接收信噪比和跟踪循环误差中的一个或多个的函数。

公开(公告)号：US08848813B2

公开(公告)日：2014-09-30

申请号：US13710120

申请日：2012-12-10

Applicant: Texas Instruments Incorporated

Inventor： Sarma S Gunturi ,  Atul Deshpande

IPC: H04K1/10 ,  H04L27/26

CPC classification number: H04L27/2623

Abstract: A peak-to-average ratio (PAR) of a signal is reduced by clipping the signal at a threshold level and replacing desired frequency tones of the clipped signal with set of frequency tones of the signal. In one embodiment, the PAR of a signal is reduced by adding a peak cancellation signal to the received signal. The peak cancellation signal is generated by clipping the received signal at a threshold level and generating a difference signal by subtracting the received signal from the clipped signal. The peak cancellation signal thus generated is scaled by a scaling factor and added to the received signal to reduce the PAR of the received signal. The scaling factor is adjusted to maintain the desired quality of the received signal. In one embodiment, the PAR of an orthogonal frequency division multiplexed (OFDM) signal may be reduced.

Abstract translation: 信号的峰值平均比（PAR）通过将信号限幅在阈值水平来降低，并且用信号的频率组合的集合来代替限幅信号的期望频率音调。 在一个实施例中，通过向接收信号添加峰值抵消信号来减小信号的PAR。 峰值消除信号是通过将接收信号削波在阈值电平而产生的，并且通过从剪辑信号中减去接收信号来产生差分信号。 由此产生的峰值消除信号由缩放因子缩放并加到接收信号上以减小接收信号的PAR。 调整比例因子以保持接收信号的期望质量。 在一个实施例中，可以减少正交频分复用（OFDM）信号的PAR。

公开(公告)号：US20140161202A1

公开(公告)日：2014-06-12

申请号：US13710120

申请日：2012-12-10

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Sarma S. Gunturi ,  Atul Deshpande

IPC: H04L27/26

CPC classification number: H04L27/2623

Abstract: A peak-to-average ratio (PAR) of a signal is reduced by clipping the signal at a threshold level and replacing desired frequency tones of the clipped signal with set of frequency tones of the signal. In one embodiment, the PAR of a signal is reduced by adding a peak cancellation signal to the received signal. The peak cancellation signal is generated by clipping the received signal at a threshold level and generating a difference signal by subtracting the received signal from the clipped signal. The peak cancellation signal thus generated is scaled by a scaling factor and added to the received signal to reduce the PAR of the received signal. The scaling factor is adjusted to maintain the desired quality of the received signal. In one embodiment, the PAR of an orthogonal frequency division multiplexed (OFDM) signal may be reduced.

Abstract translation: 信号的峰值平均比（PAR）通过将信号限幅在阈值水平来降低，并且用信号的频率组合的集合来代替限幅信号的期望频率音调。 在一个实施例中，通过向接收信号添加峰值抵消信号来减小信号的PAR。 峰值消除信号是通过将接收信号削波在阈值电平而产生的，并且通过从剪辑信号中减去接收信号来产生差分信号。 由此产生的峰值消除信号由缩放因子缩放并加到接收信号上以减小接收信号的PAR。 调整比例因子以保持接收信号的期望质量。 在一个实施例中，可以减少正交频分复用（OFDM）信号的PAR。