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1. 发明授权

US5471217A Method and apparatus for smoothing code measurements in a global positioning system receiver 失效
标题翻译：用于在全球定位系统接收机中平滑码测量的方法和装置
公开(公告)号：US5471217A
公开(公告)日：1995-11-28
申请号：US12061
申请日：1993-02-01
申请人： Ronald R. Hatch , Jerry E. Knight
发明人： Ronald R. Hatch , Jerry E. Knight
IPC分类号： G01S1/00 , G01S5/14 , G01S19/32 , G01S19/44 , H04B7/185 , G01S5/02
CPC分类号： G01S19/43 , G01S19/426
摘要： A technique for smoothing pseudorange code measurements made in a global positioning system (GPS) receiver, with carrier phase measurements, over an extended time interval but without distortion that usually results from a divergence between code-derived pseudorange measurements and carrier-derived measurements. The basic principle of the invention is to remove ionospheric effects and Doppler effects from the pseudorange code measurements prior to filtering over an extended time interval. Removal of ionospheric effects may be effected by applying corrections received from a reference receiver, or may be accomplished using measured or modeled ionospheric data available to the receiver. The invention is applicable to differential GPS position finding using remote receivers having only a single-frequency capability, but is also applicable to stand-alone GPS receivers of any type.
摘要翻译：一种用于平滑在全球定位系统（GPS）接收机中进行的伪距代码测量的技术，其具有载波相位测量，在延长的时间间隔上，但是没有通常由代码导出的伪距测量和载波导出的测量之间的差异产生的失真。本发明的基本原理是在延长的时间间隔过滤之前，从伪距码测量中去除电离层效应和多普勒效应。可以通过应用从参考接收器接收的校正来实现电离层效应的去除，或者可以使用接收机可用的测量或建模的电离层数据来实现。本发明适用于使用仅具有单频能力的远程接收机的差分GPS位置查找，但也适用于任何类型的独立GPS接收机。

2. 发明授权

US5535278A Global positioning system (GPS) receiver for recovery and tracking of signals modulated with P-code 失效
标题翻译：全球定位系统（GPS）接收机，用于恢复和跟踪用P码调制的信号
公开(公告)号：US5535278A
公开(公告)日：1996-07-09
申请号：US236291
申请日：1994-05-02
申请人： Charles R. Cahn , Richard G. Keegan , Jerry E. Knight , Thomas A. Stansell, Jr.
发明人： Charles R. Cahn , Richard G. Keegan , Jerry E. Knight , Thomas A. Stansell, Jr.
IPC分类号： G01S1/00 , G01S19/09 , G01S19/39 , H04B1/707 , H04L9/00
CPC分类号： G01S19/32 , G01S19/24 , H04B1/707
摘要： Method and apparatus for improving the speed and accuracy of processing signals from global positioning system (GPS) receivers by ensuring access to GPS carrier signals that have been modulated with an encrypted P-code sequence. In one disclosed embodiment of the invention, GPS L1 and L2 signals are correlated with a locally generated P-code signal, bandpass filtered to enhance signal-to-noise ratio performance, and then cross-correlated to obtain a signal with an L1-L2 frequency component that facilitates the resolution of carrier cycle ambiguity. In another embodiment, received GPS signals are immediately converted to digital form, then digitally correlated with in-phase and quadrature components of a locally generated P-code signal. Signals resulting from the correlation are then integrated over timing intervals corresponding to a previously determined encryption period to provide in-phase (I) and quadrature (Q) samples. In one variant of this embodiment, the I and Q samples derived from the L2 GPS signal are digitally squared to obtain an L2 carrier. In another variant, I and Q samples derived from both L1 and L2 signals are cross-correlated to obtain a digital carrier with an L 1-L2 component. Tracking errors for the L1 and L2 P-code signals are computed using a similar digital technique.
摘要翻译：用于通过确保访问已经用加密的P代码序列调制的GPS载波信号来提高来自全球定位系统（GPS）接收机的处理信号的速度和精度的方法和装置。在本发明的一个公开的实施例中，GPS L1和L2信号与本地生成的P码信号相关，经过滤波以提高信噪比性能，然后互相关以获得具有L1-L2 有助于解决载波周期模糊的频率分量。在另一个实施例中，接收到的GPS信号被立即转换成数字形式，然后与本地产生的P码信号的同相和正交分量数字相关。然后，通过相应于先前确定的加密周期的定时间隔来集成由相关产生的信号，以提供同相（I）和正交（Q）采样。在该实施例的一个变型中，从L2 GPS信号导出的I和Q样本是数字平方的，以获得L2载波。在另一变型中，从L1和L2信号两者导出的I和Q样本是相互关联的，以获得具有L 1-L2分量的数字载波。使用类似的数字技术计算L1和L2 P码信号的跟踪误差。

3. 发明申请

US20140070997A1 Navigation Using Range Measurements to OFDM Transmitters 有权
标题翻译：使用范围测量导航到OFDM发射机
公开(公告)号：US20140070997A1
公开(公告)日：2014-03-13
申请号：US13784665
申请日：2013-03-04
申请人： Richard G. Keegan , Jerry E. Knight
发明人： Richard G. Keegan , Jerry E. Knight
IPC分类号： G01S3/02
CPC分类号： G01S3/02 , G01S5/0221 , G01S5/145 , G01S11/02 , G01S11/08 , G01S19/46
摘要： A signal receiver receives a time-domain signal that includes a plurality of pilot tones at a plurality of corresponding frequencies. The time-domain signal is transmitted from a transmit location. The signal receiver extracts from the received time-domain signal pilot phase values corresponding to the pilot tones. The signal receiver computes a signal propagation time of the received time-domain signal by fitting an interpolation function to residual pilot phase values, corresponding to the extracted pilot phase values, and determines a slope of the interpolation function. The signal receiver computes a range between the transmit location and the signal receiver by multiplying the computed signal propagation time with the speed of light.
摘要翻译：信号接收机接收包含多个相应频率的多个导频音调的时域信号。时域信号从发送位置发送。信号接收机从对应于导频音调的接收到的时域信号导频相位值中提取出来。信号接收机通过将内插函数拟合到对应于提取的导频相位值的残余导频相位值来计算接收时域信号的信号传播时间，并确定内插函数的斜率。信号接收机通过将计算出的信号传播时间与光速相乘来计算发射位置和信号接收机之间的范围。

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