公开(公告)号：US08242953B2

公开(公告)日：2012-08-14

申请号：US13226311

申请日：2011-09-06

Applicant: Liwen L. Dai ,  Daniel J. Eslinger ,  Richard T. Sharpe ,  Ronald R. Hatch

Inventor： Liwen L. Dai ,  Daniel J. Eslinger ,  Richard T. Sharpe ,  Ronald R. Hatch

IPC: G01S19/41 ,  G01S19/43

CPC classification number: G01S19/32 ,  G01S19/44

Abstract: A method for mitigating atmospheric errors in code and carrier phase measurements based on signals received from a plurality of satellites in a global navigation satellite system is disclosed. A residual tropospheric delay and a plurality of residual ionospheric delays are modeled as states in a Kalman filter. The state update functions of the Kalman filter include at least one baseline distance dependant factor, wherein the baseline distance is the distance between a reference receiver and a mobile receiver. A plurality of ambiguity values are modeled as states in the Kalman filter. The state update function of the Kalman filter for the ambiguity states includes a dynamic noise factor. An estimated position of mobile receiver is updated in accordance with the residual tropospheric delay, the plurality of residual ionospheric delays and/or the plurality of ambiguity values.

Abstract translation: 公开了一种基于从全球导航卫星系统中的多个卫星接收的信号来减轻码和载波相位测量中的大气误差的方法。 剩余的对流层延迟和多个剩余电离层延迟被建模为卡尔曼滤波器中的状态。 卡尔曼滤波器的状态更新功能包括至少一个基线距离相关因子，其中基线距离是参考接收机与移动接收机之间的距离。 多个模糊值被建模为卡尔曼滤波器中的状态。 用于模糊状态的卡尔曼滤波器的状态更新功能包括动态噪声系数。 移动接收机的估计位置根据剩余对流层延迟，多个剩余电离层延迟和/或多个模糊度值来更新。

公开(公告)号：US20090102708A1

公开(公告)日：2009-04-23

申请号：US12341969

申请日：2008-12-22

Applicant: Liwen L. Dai ,  Chaochao Wang ,  Daniel J. Eslinger ,  Ronald R. Hatch ,  Richard T. Sharpe

Inventor： Liwen L. Dai ,  Chaochao Wang ,  Daniel J. Eslinger ,  Ronald R. Hatch ,  Richard T. Sharpe

IPC: G01S5/14

CPC classification number: G01S19/44 ,  G01S19/41 ,  G01S19/42

Abstract: A mobile satellite navigation receiver for calculating an offset between a local positioning system and a wide-area satellite positioning system is presented. The mobile satellite navigation receiver determines a first solution of a position of the mobile satellite navigation receiver relative to a first local positioning system, wherein the first local positioning system includes one or more reference receivers at known locations. The mobile satellite navigation receiver determines a second solution of the position of the satellite navigation receiver relative to a wide-area differential satellite positioning system. The mobile satellite navigation receiver then calculates an offset between the first solution and the second solution.

Abstract translation: 提出了一种用于计算本地定位系统和广域卫星定位系统之间的偏移的移动卫星导航接收机。 移动卫星导航接收机确定移动卫星导航接收机相对于第一本地定位系统的位置的第一解决方案，其中第一本地定位系统包括在已知位置处的一个或多个参考接收机。 移动卫星导航接收机确定卫星导航接收机相对于广域差分卫星定位系统的位置的第二解。 然后，移动卫星导航接收机计算第一解和第二解之间的偏移。

公开(公告)号：US07248211B2

公开(公告)日：2007-07-24

申请号：US10899570

申请日：2004-07-26

Applicant: Ronald R. Hatch ,  Richard T. Sharpe

Inventor： Ronald R. Hatch ,  Richard T. Sharpe

IPC: G01S5/04

CPC classification number: G01S19/43 ,  G01S5/0045 ,  G01S19/41

Abstract: A method and system are provided to determine a relative position vector between primary receiver associated with a reference station and secondary receiver associated with a user. The method and system determine a position of the reference station at the reference station according to signals received thereat from a plurality of satellites, determine a position of the user receiver at the user based on measurements obtained thereat and on error corrections computed at the reference station, and compute the relative position vector by differencing the position of the reference station and the position of the user.

Abstract translation: 提供了一种方法和系统来确定与参考站相关联的主接收机与与用户相关联的辅助接收机之间的相对位置矢量。 该方法和系统根据从多个卫星接收的信号来确定参考站在参考站处的位置，基于在那里获得的测量结果确定用户接收机在用户接收机上的位置以及在参考站处计算的误差校正 并且通过差分参考站的位置和用户的位置来计算相对位置矢量。

公开(公告)号：US07119741B2

公开(公告)日：2006-10-10

申请号：US10757340

申请日：2004-01-13

Applicant: Richard T. Sharpe ,  Frederick W. Nelson ,  Terence D. Pickett ,  Ronald R. Hatch ,  Yunchun Yang

Inventor： Richard T. Sharpe ,  Frederick W. Nelson ,  Terence D. Pickett ,  Ronald R. Hatch ,  Yunchun Yang

IPC: H04B7/185 ,  G01S5/14

CPC classification number: G01S19/44

Abstract: The present invention includes a method for a combined use of a local RTK system and a regional, wide-area, or global differential carrier-phase positioning system (WADGPS) in which disadvantages associated with the RTK and the WADGPS navigation techniques when used separately are avoided. The method includes using a known position of a user receiver that has been stationary or using an RTK system to initialize the floating ambiguity values in the WADGPS system when the user receiver is moving. Thereafter, the refraction-corrected carrier-phase measurements obtained at the user GPS receiver are adjusted by including the corresponding initial floating ambiguity values and the floating ambiguity values are treated as well known (small variance) in subsequent processes to position the user receiver in the WADGPS system.

Abstract translation: 本发明包括一种组合使用本地RTK系统和区域，广域或全球差分载波相位定位系统（WADGPS）的方法，其中分别使用与RTK和WADGPS导航技术相关的缺点是 避免。 该方法包括当用户接收机正在移动时，使用固定的用户接收机的已知位置或使用RTK系统来初始化WADGPS系统中的浮动模糊度值。 此后，通过包括相应的初始浮点模糊度值来调整在用户GPS接收机处获得的经折射校正的载波相位测量值，并且在随后的处理中将浮动模糊度值视为已知（小的方差），以将用户接收机定位在 WADGPS系统。

公开(公告)号：US06603803B1

公开(公告)日：2003-08-05

申请号：US09520152

申请日：2000-03-07

Applicant: Ronald R. Hatch

Inventor： Ronald R. Hatch

IPC: H04B1707

CPC classification number: H04B1/7085 ,  G01S19/22 ,  G01S19/30 ,  G01S19/37 ,  H04B1/709

Abstract: A Global Positioning System receiver includes an intermediate frequency (IF) processor configured to downconvert broadcast signal to generate a first channel signal which is further downconverted to recover a PRN signal by an angle rotator. The receiver further includes a signal generator configured to generate N gated PRN signals. The N gated PRN signals are generated based on a local replica PRN signal time-divided by M intervals within a chip period of the local replica PRN signal. N and M are positive integers. A number of correlators is also provided. Each of which the correlators are configured to multiply a respective one of N gated PRN signals with the PRN signal to generate a number of correlation values. The correlation values are utilized to monitor distortions in the broadcast signal and/or to track the carrier frequency signal. Further, a corresponding method is also provided.

Abstract translation: 全球定位系统接收机包括中频（IF）处理器，其被配置为下变频广播信号以产生第一信道信号，该第一信道信号被进一步下变频以通过角度旋转器恢复PRN信号。 接收机还包括被配置为产生N个门控PRN信号的信号发生器。 N门控PRN信号基于在本地副本PRN信号的码片周期内由M个间隔划分的局部副本PRN信号来生成。 N和M是正整数。 还提供了许多相关器。 每个相关器被配置为将N个门控PRN信号中的相应一个与PRN信号相乘以产生多个相关值。 相关值用于监视广播信号中的失真和/或跟踪载波频率信号。 此外，还提供了相应的方法。

公开(公告)号：US5717403A

公开(公告)日：1998-02-10

申请号：US524083

申请日：1995-09-06

Applicant: Frederick Nelson ,  Richard Kai-Tuen Woo ,  Ronald R. Hatch

Inventor： Frederick Nelson ,  Richard Kai-Tuen Woo ,  Ronald R. Hatch

IPC: G01S1/00 ,  H03L7/00 ,  G01S5/02

CPC classification number: H03L7/00

Abstract: A method and apparatus for synthesizing a stable reference signal of a desired frequency within a spread spectrum receiver is disclosed herein. The spread spectrum receiver is designed for use in conjunction with a global positioning system (GPS) receiver, and operates to receive broadcast differential GPS correction information. The present frequency synthesis technique contemplates generating a sequence of timing signals within the GPS receiver on the basis of GPS satellite signals received thereby, and providing the timing signals to the signal receiver. Within the signal receiver, the signal cycles of a local oscillator occurring between ones of the timing signals are counted. The frequency of the local oscillator is then determined by dividing the counted cycles of the local oscillator by one of the known time intervals. The determined frequency of output signals produced by the local oscillator is then scaled so as necessary to produce the reference signal of desired frequency. This allows precisely controlled reference frequencies to be obtained irrespective of the existence of frequency instability within the local oscillator. In a preferred implementation, the stable reference signals are employed during acquisition of differential GPS correction signals received by the spread spectrum receiver. In particular, the desired reference frequency is incrementally adjusted during the process of searching for and acquiring the exact frequency of the incident differential GPS correction signals. The spread spectrum receiver is disposed to provide differential GPS correction information extracted from the acquired differential GPS correction signals to the GPS receiver.

Abstract translation: 本文公开了一种用于在扩频接收机内合成所需频率的稳定参考信号的方法和装置。 扩频接收机被设计为与全球定位系统（GPS）接收机一起使用，并且操作以接收广播差分GPS校正信息。 本频率合成技术考虑根据由此接收的GPS卫星信号，在GPS接收机内产生定时信号序列，并向定时信号提供信号。 在信号接收器内，对定时信号之间发生的本地振荡器的信号周期进行计数。 然后通过将本地振荡器的计数周期除以已知时间间隔之一来确定本地振荡器的频率。 然后对本地振荡器产生的输出信号的确定频率进行缩放，以便产生所需频率的参考信号。 这允许获得精确控制的参考频率，而不管本地振荡器内是否存在频率不稳定性。 在优选实施例中，在采集由扩频接收机接收的差分GPS校正信号的采集期间采用稳定的参考信号。 特别地，在搜索和获取入射差分GPS校正信号的确切频率的过程中，期望的参考频率被递增地调整。 扩频接收机被设置为提供从所获取的差分GPS校正信号中提取到GPS接收机的差分GPS校正信息。

公开(公告)号：US08659474B2

公开(公告)日：2014-02-25

申请号：US13299324

申请日：2011-11-17

Applicant: Liwen L. Dai ,  Ronald R. Hatch ,  Yujie Zhang ,  Min Wang

Inventor： Liwen L. Dai ,  Ronald R. Hatch ,  Yujie Zhang ,  Min Wang

IPC: G01S19/07

CPC classification number: G01S19/04 ,  G01S19/07 ,  G01S19/44

Abstract: A system and method for providing improved correction information to navigation receivers includes receiving, from a plurality of reference stations at known locations, a plurality of satellite navigation measurements of signals from a plurality of global navigation satellites. A state of the plurality of global navigation satellites is computed based on the received satellite navigation measurements. Baselines, each corresponding to a pair of the reference stations, are identified. For each identified baseline, computing floating and integer values for a double-differenced integer ambiguity. Double-differenced integer ambiguities that satisfy a set of predefined conditions are identified, and the computed state of the plurality of global navigation satellites is adjusted in accordance with an integer value constraint applied to each double-differenced integer ambiguity that satisfies the set of predefined conditions. The correction information is computed from the adjusted computed state of the plurality of global navigation satellites.

Abstract translation: 用于向导航接收机提供改进的校正信息的系统和方法包括从已知位置的多个参考站接收来自多个全球导航卫星的信号的多个卫星导航测量。 基于接收到的卫星导航测量来计算多个全球导航卫星的状态。 识别各自对应于一对参考站的基线。 对于每个确定的基准，计算双差分整数模糊度的浮点数和整数值。 识别满足一组预定义条件的双差分整数模糊度，并且根据应用于满足预定条件集合的每个双差分整数模糊度的整数值约束来调整多个全局导航卫星的计算状态 。 从多个全球导航卫星的经调整的计算状态计算校正信息。

公开(公告)号：US20110090116A1

公开(公告)日：2011-04-21

申请号：US12898629

申请日：2010-10-05

Applicant: Ronald R. Hatch ,  Liwen L. Dai

Inventor： Ronald R. Hatch ,  Liwen L. Dai

IPC: G01S19/21

CPC classification number: G01S19/40 ,  G01S19/20

Abstract: A system and method for compensating for faulty satellite navigation measurements. A plurality of measurements in a system is received for a measurement epoch. A Kalman filter is used to calculate a state of the system for the measurement epoch based on the plurality of measurements, wherein the state of the system for the measurement epoch is calculated using a first closed-form update equation. A faulty measurement is detected in the plurality of measurements for the measurement epoch and a revised state of the system for the measurement epoch that compensates for the faulty measurement is calculated, using the calculated state of the system for the measurement epoch as an input to the revised state calculation, and using a revised closed-form update equation comprising the first closed-form update equation modified with respect to the faulty measurement.

Abstract translation: 用于补偿卫星导航测量故障的系统和方法。 在测量纪元中接收系统中的多个测量。 卡尔曼滤波器用于基于多个测量来计算用于测量纪元的系统的状态，其中使用第一闭式更新方程来计算用于测量纪元的系统的状态。 在测量时期的多个测量中检测到有故障的测量，并且使用计算的测量时期的系统的状态来计算用于补偿有缺陷的测量的测量纪元的系统的修正状态作为输入 修改后的状态计算，以及使用修改后的封闭形式更新方程式，其包括关于故障测量修改的第一封闭形式更新公式。

公开(公告)号：US07633437B2

公开(公告)日：2009-12-15

申请号：US11525756

申请日：2006-09-22

Applicant: Ronald R. Hatch

Inventor： Ronald R. Hatch

IPC: G01H1/00

CPC classification number: G01S19/44

Abstract: A new three-frequency technique for obtaining geometry free, refraction-corrected, ambiguity-resolved, carrier-phase measurements has been described. First, the ambiguities on at least two wide-lane carrier-phase measurement differences are obtained by averaging the corresponding frequency weighted code measurements. These two ambiguity-resolved measurements are then combined into a composite refraction-corrected measurement. The resulting composite measurement is quite noisy due to the amplification of the multipath noise in the original carrier-phase measurements. But this noisy refraction-corrected carrier-phase measurement can be smoothed with another minimum-noise, refraction-corrected carrier-phase composite measurement. The minimum-noise, refraction-corrected composite measurement is constructed from the primary carrier-phase measurements prior to resolving their whole-cycle ambiguities. By smoothing the difference in the two refraction-corrected measurements, the noise can be reduced and the bias in the low-noise measurement (due to incorrect ambiguities) can be estimated and subsequently corrected.

Abstract translation: 已经描述了用于获得几何自由，折射校正，模糊度分辨，载波相位测量的新的三频技术。 首先，通过对相应的频率加权码测量进行平均，获得至少两个宽车道载波相位测量差异的含义。 然后将这两个歧义解析的测量结合成复合折射校正测量。 由于在原始载波相位测量中的多路径噪声的放大，所得到的复合测量是非常嘈杂的。 但是这种噪声折射校正的载波相位测量可以通过另一个最小噪声，折射校正的载波相位复合测量来平滑。 最小噪声，折射校正复合测量在解决其全周期模糊之前由主载波相位测量构建。 通过平滑两个折射校正测量的差异，可以降低噪声，并且可以估计并随后校正低噪声测量中的偏差（由于不正确的模糊性）。

公开(公告)号：US20080297408A1

公开(公告)日：2008-12-04

申请号：US12119450

申请日：2008-05-12

Applicant: Liwen L. Dai ,  Daniel J. Eslinger ,  Richard T. Sharpe ,  Ronald R. Hatch

Inventor： Liwen L. Dai ,  Daniel J. Eslinger ,  Richard T. Sharpe ,  Ronald R. Hatch

IPC: G01S5/14

CPC classification number: G01S19/55

Abstract: A method for performing integer ambiguity resolution in a global navigation satellite system is disclosed. A set of ambiguities, which are associated with carrier phase measurements of at least some of the signals received from the satellites in an identified set of satellites, are identified. Integer ambiguities are estimated and a best candidate set and a second best candidate set of integer ambiguity values are determined. Upon determining that the best set of integer ambiguity values fail to meet a discrimination test, each ambiguity for which integer ambiguity values in the best candidate set and second best candidate set fail to meet predefined criteria are removed from the set of ambiguities to produce a reduced set of ambiguities. The integer ambiguities in the reduced set of ambiguities are then resolved and an output is generated in accordance with the resolved integer ambiguities.

Abstract translation: 公开了一种在全球导航卫星系统中执行整数模糊度分解的方法。 识别与识别的卫星组中的卫星接收的至少一些信号的载波相位测量相关联的一组模糊度。 估计整数模糊度，并确定最佳候选集和第二最佳候选集合的整数模糊度值。 在确定最佳集合的整数模糊度值不能满足鉴别测试时，最佳候选集合和第二最佳候选集合中的整数模糊度值不能满足预定标准的每个模糊度从该组模糊度中消除以产生缩减 一套模棱两可 然后解析缩小的模糊集合中的整数模糊度，并根据解析的整数模糊度生成输出。