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公开(公告)号：US5973639A
公开(公告)日：1999-10-26
申请号：US935576
申请日：1997-09-23
申请人： Zoltan Biacs , Dominic Farmer
发明人： Zoltan Biacs , Dominic Farmer
摘要： A method for determining an improved position fix by performing postprocessing on a realtime differentially corrected GPS position. A remote rover unit containing a GPS receiver is used to determine a differentially corrected position according to measured pseudoranges and realtime pseudorange correction vectors is broadcast by a base station. The rover unit applies realtime corrections to measurements to determine a more accurate realtime differential position. It then stores the realtime differential position and the realtime pseudorange correction vector. Subsequently, postprocessing is performed to determine a postprocessed pseudorange correction vector. A difference vector representing the difference between the realtime pseudorange correction vector and the postprocessed pseudorange correction vector is then determined. This difference vector is applied to the realtime differential position to calculate a more accurate, improved position fix. This same process can be applied to determine velocities as well.
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2.发明授权
公开(公告)号：US6049303A
公开(公告)日：2000-04-11
申请号：US327041
申请日：1999-06-07
申请人： Zoltan Biacs , Dominic Farmer
发明人： Zoltan Biacs , Dominic Farmer
摘要： A method for determining an improved position fix by performing postprocessing on a realtime differentially corrected GPS position. A remote rover unit containing a GPS receiver is used to determine a differentially corrected position according to measured pseudoranges and realtime pseudorange correction vectors is broadcast by a base station. The rover unit applies realtime corrections to measurements to determine a more accurate realtime differential position. It then stores the realtime differential position and the realtime pseudorange correction vector. Subsequently, postprocessing is performed to determine a postprocessed pseudorange correction vector. A difference vector representing the difference between the realtime pseudorange correction vector and the postprocessed pseudorange correction vector is then determined. This difference vector is applied to the realtime differential position to calculate a more accurate, improved position fix. This same process can be applied to determine velocities as well.
摘要翻译： 一种用于通过对实时差分校正的GPS位置执行后处理来确定改进的位置定位的方法。 使用包含GPS接收机的远程流动站单元根据测量的伪距来确定差分校正位置，并且由基站广播实时伪距校正向量。 流动站单元对测量进行实时校正，以确定更准确的实时差分位置。 然后存储实时差分位置和实时伪距校正矢量。 随后，执行后处理以确定后处理的伪距校正矢量。 然后确定表示实时伪距校正矢量与后处理伪距校正矢量之间的差的差矢量。 该差分矢量被应用于实时差分位置以计算更精确，改进的位置定位。 同样的过程也可以应用于确定速度。
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公开(公告)号：US20070297497A1
公开(公告)日：2007-12-27
申请号：US11766035
申请日：2007-06-20
IPC分类号： H04B1/00
CPC分类号： H04B7/0845 , H04B1/7107 , H04B1/712
摘要： An apparatus and method for interference cancellation using software or low speed hardware. Antenna signals are received and selected. After selection, interference cancellation processing is applied. In one embodiment, the signal is a spread spectrum signal and selection includes despreading the signal. In one example, the interference cancellation processing includes a phase rotation step and a magnitude manipulation step.
摘要翻译： 一种使用软件或低速硬件进行干扰消除的装置和方法。 接收和选择天线信号。 选择后，应用干扰消除处理。 在一个实施例中，信号是扩频信号，选择包括解扩信号。 在一个示例中，干扰消除处理包括相位旋转步骤和幅度操纵步骤。
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4.发明授权Apparatus and method for time maintenance in a satellite position system receiver 有权在卫星定位系统接收机中进行时间维护的装置和方法公开(公告)号：US06768448B2
公开(公告)日：2004-07-27
申请号：US10280477
申请日：2002-10-24
申请人： Dominic Farmer
发明人： Dominic Farmer
IPC分类号： H04B7185
摘要： A system for maintaining time in a satellite positioning system (SPS) receiver that relies on almanac data to maintain a reasonably accurate time. The approximate time based on almanac data is sufficiently accurate to bound the unknown parameters when a request for position is received. The receiver may automatically update the internal time and/or position. When a time update is required, the approximate time based on almanac data is sufficiently accurate that the receiver need only acquire the code phase from the satellites and can internally determine the code period into the bit and the bit into the week based on the almanac data.
摘要翻译： 用于在卫星定位系统（SPS）接收机中保持时间的系统，其依赖历书数据来保持相当准确的时间。 基于年历数据的近似时间足够精确，以便在接收到位置请求时限制未知参数。 接收机可以自动更新内部时间和/或位置。 当需要时间更新时，基于年历数据的近似时间足够精确，使得接收机只需要从卫星获取码相位，并且可以根据历书数据在内部确定码周期和位周内的码周期 。
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5.发明授权Virtual real-time clock based on time information from multiple communication systems 有权基于来自多个通信系统的时间信息的虚拟实时时钟公开(公告)号：US07551129B2
公开(公告)日：2009-06-23
申请号：US11553610
申请日：2006-10-27
申请人： Dominic Farmer
发明人： Dominic Farmer
CPC分类号： G04R20/02 , H04W56/0015 , H04W56/005
摘要： Method and apparatus to implement a “virtual” real-time clock at a terminal based on time information from multiple communication systems. At least one system (e.g., GPS) provides “absolute” time information for the virtual real-time clock, and at least one other system (e.g., a cellular system) provides “relative” time information. The virtual real-time clock is “time-stamped” with absolute time as it becomes available from the first system. Relative time (which may be received from multiple asynchronous transmitters) is mapped to the timeline of the virtual real-time clock as it is received from the second system. Absolute time at any arbitrary time instant on the timeline may then be estimated based on the absolute time from the first system and the relative time from the second system. Absolute times from the first system for two or more time instants may also be used to calibrate the relative time from the second system.
摘要翻译： 基于来自多个通信系统的时间信息在终端上实现“虚拟”实时时钟的方法和装置。 至少一个系统（例如，GPS）为虚拟实时时钟提供“绝对”时间信息，并且至少一个其他系统（例如，蜂窝系统）提供“相对”时间信息。 虚拟实时时钟随着从第一个系统可用而具有绝对时间“时间戳”。 从第二系统接收到的相对时间（可以从多个异步发送器接收）被映射到虚拟实时时钟的时间线。 然后可以基于从第一系统的绝对时间和来自第二系统的相对时间来估计在时间线上任意任意时刻的绝对时间。 用于两个或更多个时刻的第一系统的绝对时间也可用于校准与第二系统相对的时间。
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公开(公告)号：US5630208A
公开(公告)日：1997-05-13
申请号：US277150
申请日：1994-07-19
申请人： Per Enge , Dominic Farmer , John F. Schipper
发明人： Per Enge , Dominic Farmer , John F. Schipper
摘要： Method and apparatus for using a plurality of correlators to improve an estimate of direct signal arrival time by identifying features of a correlation function at and adjacent to the correlation peak. In a first embodiment, the errors in location of the center point of a correlation function R(.tau.), formed by the incoming composite signal and a stored copy of the expected signal, are assumed to be strongly correlated for narrow sample spacing and wide sample spacing of the correlation function. In a second embodiment, multipath signal strengths and phases are estimated, using multiple sampling of the correlation function R(.tau.). This approach assumes that path delays of the direct signal and of the multipath signals can be determined separately. Path delays can be determined by any of at least three approaches: (1) identification of slope transition points in the correlation function; (2) Cepstrum processing of the received signal, using Fourier transform analysis; and (3) use of a grid of time points on the correlation function domain, and identification of time values, associated with certain solution parameters of the least mean squares analysis that have the largest absolute values, as times of arrival of the direct and multipath signals. Separate identification of multipath time delays reduces the least mean squares analysis to a linear problem. A modified signal is constructed, with the multipath signal(s) approximately removed from the incoming composite signal. This modified signal allows a better estimate of the arrival time of the direct signal.
摘要翻译： 用于使用多个相关器来通过识别和相邻相关峰值的相关函数的特征来改善直接信号到达时间的估计的方法和装置。 在第一实施例中，假定由输入复合信号形成的相关函数R（τ）的中心点的位置误差和预期信号的存储副本对于窄采样间隔和宽采样是强相关的 相关函数的间距。 在第二实施例中，使用相关函数R（τ）的多个采样来估计多径信号强度和相位。 该方法假设可以分别确定直接信号和多径信号的路径延迟。 路径延迟可以通过至少三种方法中的任何一种来确定：（1）识别相关函数中的斜率跃迁点; （2）倒频谱处理的接收信号，采用傅里叶变换分析; 和（3）在相关函数域上使用时间网格，以及与具有最大绝对值的最小均方分析的某些解的参数相关联的时间值的识别作为直接和多径的到达时间 信号。 多路径时间延迟的分离识别将线性问题的最小均方分析降低。 构造修改的信号，其中多路径信号从输入的复合信号中大致去除。 该修改的信号允许更好地估计直接信号的到达时间。
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公开(公告)号：US5465413A
公开(公告)日：1995-11-07
申请号：US27004
申请日：1993-03-05
申请人： Per Enge , Dominic Farmer , Brian Westfall
发明人： Per Enge , Dominic Farmer , Brian Westfall
IPC分类号： H04B1/12
CPC分类号： H04B1/123
摘要： Method and apparatus for reducing or cancelling impulse noise from a signal containing noise. The desired noise-free signal is assumed to have a representative frequency .omega..sub.3, but may have a range of frequencies adjacent to this frequency, and is assumed to have substantially zero amplitude for all frequencies .omega. .omega..sub.2, where .omega..sub.1
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公开(公告)号：US20060129317A1
公开(公告)日：2006-06-15
申请号：US11253359
申请日：2005-10-18
申请人： Dominic Farmer , Suzanne Arcens
发明人： Dominic Farmer , Suzanne Arcens
IPC分类号： G01C21/26
摘要： A mobile station database of cellular identifications and associated position information is stored in mobile station memory. The mobile station uses the position information in the database to assist in determining a current position for the mobile based on an identifier, such as cell ID, base station BSIC, PSC, or carrier frequency. A satellite vehicle signal is searched in an uncertainty region that is a function of position information associated with the current identifier. The uncertainty region can be limited by assumed platform dynamics via predefined velocity and acceleration information. Time maintenance for the mobile station can also be achieved through known approximate position from the position database and measurement of a single satellite vehicle propagation delay. The mobile station can compare a position determination obtained through satellite vehicle signals with position database information to determine the validity of that position. Out-of-network position information is also stored in the position database and is optionally shared with a network.
摘要翻译： 蜂窝标识和相关位置信息的移动台数据库存储在移动台存储器中。 移动站使用数据库中的位置信息来帮助基于诸如小区ID，基站BSIC，PSC或载波频率的标识符确定移动站的当前位置。 在作为与当前标识符相关联的位置信息的函数的不确定区域中搜索卫星车辆信号。 不确定区域可以通过预定义的速度和加速度信息被假设的平台动力学限制。 移动台的时间维护也可以通过位置数据库的已知近似位置和单个卫星车辆传播延迟的测量来实现。 移动台可以将通过卫星车辆信号获得的位置确定与位置数据库信息进行比较，以确定该位置的有效性。 网络外位置信息也存储在位置数据库中，并且可选地与网络共享。
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9.发明授权Apparatus and method for time maintenance in a satellite position system receiver 有权在卫星定位系统接收机中进行时间维护的装置和方法公开(公告)号：US07006036B2
公开(公告)日：2006-02-28
申请号：US10801279
申请日：2004-03-16
申请人： Dominic Farmer
发明人： Dominic Farmer
IPC分类号： H04B7/185
摘要： A system for maintaining time in a satellite positioning system (SPS) receiver that relies on almanac data to maintain a reasonably accurate time. The approximate time based on almanac data is sufficiently accurate to bound the unknown parameters when a request for position is received. The receiver may automatically update the internal time and/or position. When a time update is required, the approximate time based on almanac data is sufficiently accurate that the receiver need only acquire the code phase from the satellites and can internally determine the code period into the bit and the bit into the week based on the almanac data.
摘要翻译： 用于在卫星定位系统（SPS）接收机中保持时间的系统，其依赖历书数据来保持相当准确的时间。 基于年历数据的近似时间足够精确，以便在接收到位置请求时限制未知参数。 接收机可以自动更新内部时间和/或位置。 当需要时间更新时，基于年历数据的近似时间足够精确，使得接收机只需要从卫星获取码相位，并且可以根据历书数据在内部确定码周期和位周内的码周期 。
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公开(公告)号：US6031882A
公开(公告)日：2000-02-29
申请号：US851873
申请日：1997-05-06
申请人： Per Enge , Dominic Farmer , John F. Schipper
发明人： Per Enge , Dominic Farmer , John F. Schipper
摘要： Method and apparatus for using a plurality of correlators to improve the estimate of direct signal arrival time by identifying detailed features of a correlation function at and adjacent to the correlation peak. The errors in location of the center point of a correlation function R(.tau.), formed by the received signal and a stored copy of the expected signal, are assumed to be strongly correlated for narrow sample spacing and wide sample spacing of the correlation function. Alternatively, the multipath signal strengths and phases are estimated by a least mean squares analysis, using multiple sampling of a correlation function of an expected signal and an arriving composite signal that includes the direct signal and one or more multipath signals. Times of arrival or path delays of the direct signal and the multipath signals are determined separately. Path delays can be determined by at least three approaches: (1) identification of slope transition points in the correlation function R(.tau.); (2) Cepstrum processing of the received signal, using Fourier transform and inverse transform analysis; and (3) use of a grid of time shift points for the correlation function, and identification of time shift values, associated with certain solution parameters for a least mean squares analysis that have the largest absolute values, as times of arrival of the direct and multipath signals. Separate identification of path delays reduces the least mean squares analysis to a solvable linear problem. A modified received signal is constructed, with multipath signal(s) approximately removed.
摘要翻译： 一种用于使用多个相关器来通过识别和相邻相关峰值的相关函数的详细特征来改善直接信号到达时间的估计的方法和装置。 假设由接收信号形成的相关函数R（τ）的中心点的位置误差和期望信号的存储副本对于相关函数的窄采样间隔和宽采样间隔而言是强相关的。 或者，使用预期信号的相关函数和包括直接信号和一个或多个多径信号的到达复合信号的多次采样，通过最小均方分析来估计多径信号强度和相位。 分别确定直达信号和多径信号的到达时间或路径延迟。 路径延迟可以通过至少三种方法来确定：（1）识别相关函数R（τ）中的斜率跃迁点; （2）使用傅里叶变换和逆变换分析对接收信号进行倒谱处理; 和（3）使用相关函数的时间移位点网格，以及与具有最大绝对值的最小均方分析的某些解决方案参数相关联的时移值的识别作为直接和 多径信号 路径延迟的单独识别将最小均方分析降低到可解的线性问题。 构造修改的接收信号，其中多径信号被近似去除。
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