公开(公告)号：US06728637B2

公开(公告)日：2004-04-27

申请号：US09888195

申请日：2001-06-22

申请人： Thomas J. Ford ,  Patrick C. Fenton ,  James O. McGuffin ,  Stanley K. Honey

发明人： Thomas J. Ford ,  Patrick C. Fenton ,  James O. McGuffin ,  Stanley K. Honey

IPC分类号： G06C2126

CPC分类号： G01S19/50 ,  G01C21/28 ,  G01S5/0027 ,  G01S5/0036 ,  G01S5/0054 ,  G01S19/04

摘要： A track model is created for use with a GPS receiver. In one embodiment, the track model is a set of planar surfaces which approximate the contiguous surface on which navigation takes place. The GPS receiver searches for an appropriate planar surface associated with its approximate position. Having found the appropriate planar surface, the GPS receiver constrains its position using the planar surface associated with its approximate position. Using the track model improves the accuracy of the computed position at the time and improves the ambiguity estimation process so that positions with greatly improved accuracy are available sooner.

摘要翻译： 创建轨道模型以与GPS接收器一起使用。 在一个实施例中，轨道模型是近似在其上进行导航的邻接表面的一组平面表面。 GPS接收机搜索与其近似位置相关联的适当平面。 找到适当的平面后，GPS接收机使用与其近似位置相关联的平面来限制其位置。 使用轨迹模型提高了计算时间位置的精度，并改善了模糊度估计过程，从而可以更快地获得具有极大提高精度的位置。

公开(公告)号：US5734674A

公开(公告)日：1998-03-31

申请号：US720862

申请日：1996-10-02

申请人： Patrick C. Fenton ,  Thomas J. Ford

发明人： Patrick C. Fenton ,  Thomas J. Ford

IPC分类号： G01S1/00 ,  H04B1/7085 ,  H04B1/709 ,  H04K1/00 ,  H04K3/00

CPC分类号： H04B1/7085 ,  G01S19/215 ,  G01S19/22 ,  G01S19/30 ,  G01S19/37 ,  G01S19/426 ,  H04B1/709 ,  G01S19/29

摘要： A receiver for pseudorandom noise (PRN) encoded signals consisting of a sampling circuit, multiple carrier and code synchronizing circuits, and multiple digital autocorrelators. The sampling circuit provides digital samples of a received composite signal to each of the several receiver channel circuits. The synchronizing circuits are preferably non-coherent, in the sense that they track any phase shifts in the received signal and adjust the frequency and phase of a locally generated carrier reference signal accordingly, even in the presence of Doppler or ionospheric distortion. The antocorrelators in each channel form a delay lock loop (DLL) which correlates the digital samples of the composite signal with locally generated PRN code values to produce a plurality of (early, late), or (punctual, early-minus-late) correlation signals. The time delay spacing between the (early, late), and (punctual, early-minus-late) correlation signals are dynamically adjusted, such that in an initial acquisition mode, the delay spacing is relatively wide, on the order of approximately one PRN code chip time; once PRN code lock is achieved, the code delay spacing is narrowed to a fraction of a PRN code chip time.

摘要翻译： 用于由抽样电路，多载波和码同步电路以及多个数字自相关器组成的伪随机噪声（PRN）编码信号的接收机。 采样电路将接收到的复合信号的数字样本提供给几个接收机通道电路中的每一个。 在同步电路优选地是非相干的，即在它们跟踪接收信号中的任何相移并相应地调整本地产生的载波参考信号的频率和相位的意义上，即使在存在多普勒或电离层失真的情况下也是如此。 每个通道中的自相关器形成延迟锁定环（DLL），其将复合信号的数字样本与本地生成的PRN码值相关联，以产生多个（早，晚）或（准时，早 - 减 - 晚）相关 信号。 （早，晚）和（准时，早 - 晚 - 晚）相关信号之间的时间延迟间隔被动态调整，使得在初始采集模式中，延迟间隔相对较宽，约为一个PRN 代码片时间; 一旦实现了PRN码锁定，码延迟间隔被缩小到PRN码片片时间的一小部分。

公开(公告)号：US20110090114A1

公开(公告)日：2011-04-21

申请号：US12579460

申请日：2009-10-15

申请人： Patrick C. Fenton

发明人： Patrick C. Fenton

IPC分类号： G01S19/54 ,  G06F15/00

CPC分类号： G01S19/54

摘要： A GNSS receiver utilizes an antenna structure that two or more antennas that are spaced apart from their neighboring antennas by less than 1 wavelength of a GNSS satellite carrier signal of interest. The receiver calculates the orientation of the antennas directly from differences in the carrier phase angles measured at the two antennas, without resolving integer carrier cycle ambiguity.

摘要翻译： GNSS接收机利用天线结构，其中两个或更多个天线与其相邻天线间隔开小于感兴趣的GNSS卫星载波信号的1个波长。 接收机直接根据在两个天线测量的载波相位角的差异来计算天线的方向，而不需要解决整数载波周期模糊度。

公开(公告)号：US20100149032A1

公开(公告)日：2010-06-17

申请号：US12640493

申请日：2009-12-17

申请人： Walter J. Feller ,  Patrick C. Fenton

发明人： Walter J. Feller ,  Patrick C. Fenton

IPC分类号： G01S19/12

CPC分类号： G01S19/05 ,  G01S5/0063 ,  G01S19/10 ,  G01S19/23 ,  G01S19/25 ,  G01S19/256 ,  G01S19/46

摘要： A system for enhancing location estimates by movable rovers including one or more base stations that engage in two way time transfer (TWTT) with the rovers. Each TWTT operation between a given base station and a given rover provides range measurements and clock differences between the base station and rover. The range measurements are based on the travel time of return TWTT signals and the clock differences are based on a phase offset of a code in the return TWTT signal and/or timing information included in the return TWTT signals.

摘要翻译： 一种用于通过可移动的漫游器增强位置估计的系统，包括一个或多个与漫游者进行双向时间传送（TWTT）的基站。 给定基站和给定流动站之间的每个TWTT操作提供基站和流动站之间的范围测量和时钟差异。 范围测量基于返回TWTT信号的行进时间，并且时钟差基于返回TWTT信号中的码的相位偏移和/或包括在返回TWTT信号中的定时信息。

公开(公告)号：US20090322601A1

公开(公告)日：2009-12-31

申请号：US12471046

申请日：2009-05-22

申请人： Jonathan Ladd ,  Patrick C. Fenton

发明人： Jonathan Ladd ,  Patrick C. Fenton

IPC分类号： G01S1/00

CPC分类号： G01S19/26 ,  G01S19/235 ,  G01S19/27

摘要： A GNSS receiver reduces the time to first fix by utilizing the properties of existing radiated signals of opportunity, such as AM or FM radio signals, television signals and so forth, to reduce the uncertainties associated with oscillator frequency and phase , and further utilizing an Almanac and battery backed-up date and time to determine the satellites in view and reduce the uncertainties associated with Doppler. The receiver may use multiple signals of opportunity to determine the city or local area in which the receiver is located based on the set of frequencies of the signals, and also to reduce search uncertainties for oscillator frequency by estimating an offset based on the differences between the frequencies of the respective signals of opportunity at the receiver and the nominal broadcast frequencies of the signals.

摘要翻译： GNSS接收器通过利用诸如AM或FM无线电信号，电视信号等的现有辐射信号的特性来减少首次固定的时间，以减少与振荡器频率和相位相关的不确定性，并且进一步利用年鉴 和电池备份的日期和时间来确定卫星的视野，并减少与多普勒相关的不确定性。 接收机可以使用多个机会信号来基于信号的频率集来确定接收机所在的城市或局域，并且还可以通过基于信号的差异来估计偏移来减少振荡器频率的搜索不确定性 在接收机处的各个机会信号的频率和信号的标称广播频率。

公开(公告)号：US20090121940A1

公开(公告)日：2009-05-14

申请号：US12270405

申请日：2008-11-13

申请人： Jonathan Ladd ,  Patrick C. Fenton

发明人： Jonathan Ladd ,  Patrick C. Fenton

IPC分类号： G01S5/10

CPC分类号： G01S5/0045 ,  G01S5/0236 ,  G01S5/10 ,  G01S5/145

摘要： A system to determine position, frequency and clock offsets over a network utilizing signals of opportunity transmitted by one or more transmitters with known locations, the system includes a base receiver with a clock and a known position that determines ranges to the transmitters, takes a series of samples of the signals of opportunity and time tags the series with times of receipt, calculated times of transmission based on the calculated ranges, or both. The base receiver transmits the time tagged series and, as appropriate, computed ranges to the remote receivers. A given remote receiver saves and time tags samples of the signals of opportunity, correlates the time-tagged series with the saved samples, and calculates a time offset as a time difference of the times of receipt at the remote receiver and either the time of receipt at the base receiver or the time of transmission calculated at the base receiver. The remote receiver calculates position based on the time offsets, and as appropriate, the ranges provided by the base receiver. The elevations of the remote receivers may be calculated as part of the position calculations, determined iteratively based on constraining the Z coordinate to an average elevation, or determined from differences in air pressure sensor readings at the base and remoter receivers.

摘要翻译： 一种系统，用于利用由具有已知位置的一个或多个发射机发送的机会信号来确定网络上的位置，频率和时钟偏移，该系统包括具有时钟的基站接收机和确定发射机的范围的已知位置， 机会信号和时间信号的采样次数根据接收次数，计算出的发射次数，基于计算的范围或两者兼容。 基站接收机将时间标记的序列和适当的时间间隔发送给远程接收机。 给定的远程接收器保存和时间标签机会信号的采样，将时间标记的序列与保存的样本相关联，并将时间偏移计算为在远程接收机处接收的时间的时间差和接收时间 在基站接收机处或在基站接收机处计算的发射时间。 遥控接收机根据时间偏移量，并根据基站接收机提供的范围来计算位置。 远程接收器的高程可以作为位置计算的一部分来计算，其迭代地基于将Z坐标约束到平均高度，或者由基座和远距离接收器的空气压力传感器读数的差异来确定。

公开(公告)号：US20090117928A1

公开(公告)日：2009-05-07

申请号：US12263940

申请日：2008-11-03

申请人： Jonathan Ladd ,  Patrick C. Fenton

发明人： Jonathan Ladd ,  Patrick C. Fenton

IPC分类号： H04B7/00

CPC分类号： H04B7/2662 ,  G04R20/06 ,  H02J3/36 ,  Y02E60/60

摘要： A system to distribute accurate time and/or frequency over a network utilizing signals of opportunity transmitted by one or more local transmitters with known locations, the system includes a base receiver with a clock synchronized to a reference time scale such as GNSS or UTC time that saves a series of samples of the signals of opportunity and time tags the series with a calculated time of broadcast. A remote receiver saves samples of the signals of opportunity and correlates the series with the saved samples. The remote receiver calculates a time of transmission of saved samples that correspond to the series, determines a time offset as a difference in the time of broadcast calculated at the remote receiver and the time of broadcast calculated at the base receiver, and determines the time offset with respect to the base receiver. The base receiver further or instead phase locks to the signal opportunity and at predetermined intervals determines phase measurements of the integrated carrier frequency of the signal of opportunity and provides the phase information to the remote receiver. The remote receiver, which is also phase locked to the same signal of opportunity, uses the phase measurement information to frequency lock its clock to the base receiver clock by determining a frequency error based on the rate of change of phase measurements made at the base receiver and the remote receiver.

摘要翻译： 一种利用由具有已知位置的一个或多个本地发射机发送的机会信号通过网络分发精确时间和/或频率的系统，该系统包括具有与例如GNSS或UTC时间的参考时标同步的时钟的基站接收机， 保存一系列机会和时间信号的样本，并以计算的广播时间标记该系列。 远程接收器保存机会信号的样本，并将该系列与保存的样本相关联。 远程接收机计算与该系列相对应的保存样本的发送时间，将时间偏移确定为在远程接收机处计算的广播时间的差异以及在基站接收机处计算的广播时间，并确定时间偏移 相对于基地接收机。 基站接收机进一步地或相反地锁定到信号机会，并且以预定间隔确定机会信号的集成载波频率的相位测量，并将相位信息提供给远程接收机。 也被锁定到相同的机会信号的远程接收机使用相位测量信息来将其时钟频率锁定到基站接收机时钟，通过基于在基站接收机上进行的相位测量的变化率来确定频率误差 和远程接收器。

公开(公告)号：US07117094B2

公开(公告)日：2006-10-03

申请号：US10891800

申请日：2004-07-15

申请人： Patrick C. Fenton

发明人： Patrick C. Fenton

IPC分类号： G01V1/00

CPC分类号： G01V3/28 ,  G01S19/05 ,  G01S19/44 ,  G01V1/003 ,  G01V1/16 ,  G01V1/22 ,  G01V1/26

摘要： A system for analyzing three-dimensional seismic data includes a plurality of digitizer units, each with a configuration of geophones, a data recording and control center, a base GPS receiver with an associated antenna with a substantially unrestricted view of the sky and at the respective digitizer units low-power slave GPS receivers that acquire and track GPS satellite signals using tracking assistance information provided by the base GPS receiver. The slave GPS receivers use the tracking assistance information to acquire and track GPS satellite signals from which the slave GPS receivers produce associated range information. The system batch processes the range information provided by the slave GPS receivers over an extended period of time to determine the precise positions of the respective slave GPS receivers. The system provides the position information to the slave GPS receivers, and the receivers locally produce associated timing signals that are based on the GPS codes. If a particular slave GPS receiver cannot, at a given time, track any GPS satellite signals, a nearby slave GPS receiver supplies timing information required for the geophone data gathering operations.

摘要翻译： 用于分析三维地震数据的系统包括多个数字化仪单元，每个数字化仪单元具有地震检波器的配置，数据记录和控制中心，具有相关天线的基本GPS接收机，天线具有基本上无限制的天空视图， 数字转换器单元低功率从站GPS接收机，采用GPS卫星信号采集和跟踪GPS接收机提供的跟踪辅助信息。 从属GPS接收机使用跟踪辅助信息来获取和跟踪从属GPS接收机从其中产生相关范围信息的GPS卫星信号。 系统批量处理从属GPS接收机在延长的时间段内提供的范围信息，以确定各个从属GPS接收机的精确位置。 该系统向从属GPS接收机提供位置信息，并且接收机本地产生基于GPS码的相关定时信号。 如果特定的从属GPS接收机在给定的时间内不能跟踪任何GPS卫星信号，则附近的从属GPS接收机提供地震检波器数据采集操作所需的定时信息。

公开(公告)号：US06618004B2

公开(公告)日：2003-09-09

申请号：US09850210

申请日：2001-05-07

申请人： Patrick C. Fenton ,  Graham Purves ,  Douglas Reid

发明人： Patrick C. Fenton ,  Graham Purves ,  Douglas Reid

IPC分类号： G01S514

CPC分类号： G01S19/07 ,  G01S5/0036 ,  G01S5/0054 ,  G01S19/41

摘要： Multiple geographically fixed reference stations, with precisely known locations, that each receive GPS signals send information to a central processing facility that generates a three dimension topographical gradient map or model of the differences between the known locations and the locations as calculated from the received GPS signals. GPS signals received by mobile users are communicated to the central processing facility whereupon the central processing facility, using the model, generates precise corrected locations of the mobile users which is sent back to the mobile users. The mobile users can use and display the locally generated position from the locally received GPS signals or the corrected position from the central processing facility.

摘要翻译： 具有精确已知位置的多个地理上固定的参考站，每个接收GPS信号都将信息发送到中央处理设施，该中央处理设施产生从接收的GPS信号计算的已知位置和位置之间的差异的三维地形梯度图或模型 。 由移动用户接收的GPS信号被传送到中央处理设施，因此使用该模型的中央处理设备生成被发送回移动用户的移动用户的精确校正位置。 移动用户可以从本地接收的GPS信号或来自中央处理设施的校正位置使用和显示本地生成的位置。

公开(公告)号：US20140125520A1

公开(公告)日：2014-05-08

申请号：US13530302

申请日：2012-06-22

申请人： Patrick C. Fenton

发明人： Patrick C. Fenton

IPC分类号： G01S19/21

CPC分类号： G01S19/215 ,  G01S19/21 ,  G01S19/36 ,  H01Q3/2629 ,  H04B7/0825 ,  H04K3/228 ,  H04K3/90 ,  H04K2203/32

摘要： An anti-jamming subsystem for a jamming signal originating along the horizon includes an anti-jamming antenna with a horizontal reception pattern constrained to receive signals originating along the horizon. The subsystem receives the signals from the anti-jamming antenna and a reference antenna, which has a half hemispherical reception pattern looking skyward. The subsystem utilizes associated phase information to phase shift the signals received by the anti jamming antenna and produce an anti-jamming signal, and combines the anti jamming signal with the signals received by the reference antenna to produce signals in which the interference from the jamming signal originating along the horizon is actively cancelled and the phase and timing information of signals received by the reference antenna from at least higher elevation satellites is preserved. The horizontal reception pattern of the anti-jamming antenna may be circular or directional toward a known jammer positioned along the horizon.

摘要翻译： 用于沿着水平线发起的干扰信号的抗干扰子系统包括具有受限于接收沿水平线发出的信号的水平接收模式的抗干扰天线。 该子系统接收来自抗干扰天线的信号和一个参考天线，该天线具有仰望的半个半球接收模式。 该子系统利用相关的相位信息来相移由抗干扰天线接收到的信号，并产生抗干扰信号，并将抗干扰信号与参考天线接收到的信号相结合，产生干扰来自干扰信号 积极地取消沿水平线发出的信号，并且保持由至少较高的高程卫星接收的参考天线的信号的相位和定时信息。 抗干扰天线的水平接收图案可以是沿着水平线定位的已知干扰信号的圆形或方向。