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    • 22. 发明授权
    • Method for using external constraints to improve the speed and
reliability of phase ambiguity resolution in real-time kinematic
initialization
    • 使用外部约束来提高实时运动学初始化中相位模糊度分辨率的速度和可靠性的方法
    • US5935194A
    • 1999-08-10
    • US779475
    • 1997-01-07
    • Nicholas C. TalbotMichael T. AllisonMark E. Nichols
    • Nicholas C. TalbotMichael T. AllisonMark E. Nichols
    • G01S19/44G01S5/14G01S19/25G01S3/02G01S5/02G06F165/00
    • G01S19/44
    • A method for obtaining integer ambiguity solutions based on externally provided constraints, e.g., altitude. Such constraints are useful in reducing the computational burden created by the search problem, and using constraints is particularly more effective when a more limited number of satellite vehicles are visible than is ordinarily the case. The constraints are exercised in a search algorithm. As the branches of the integer ambiguity search tree are traversed, an additional test is used to determine if the current search candidate is compatible with such external constraint. Because a three-dimensional position is associated with each search candidate, the branch clipping is straightforward. The ambiguity candidates are each only acceptable if their locations in space are within a confidence region bound set determined from the external constraint. Any sensor that can provide any combination of x, y, or z position information that is better than that obtainable from GPS code phase is a candidate source of such external constraints.
    • 一种基于外部提供的约束(例如高度)获得整数模糊度解的方法。 这样的约束对于减少由搜索问题产生的计算负担是有用的,并且当通常情况下可见的卫星载体数量更有限时,使用约束特别有效。 约束在搜索算法中进行。 当遍历整数模糊搜索树的分支时,使用附加测试来确定当前搜索候选是否与这样的外部约束兼容。 因为三维位置与每个搜索候选者相关联,所以分支剪切是简单的。 只有当它们在空间中的位置在从外部约束确定的置信区域界限集中时,模糊度候选者才可以接受。 任何可以提供x,y或z位置信息的任何组合的传感器,其优于从GPS码相位获得的位置信息,这是这种外部约束的候选来源。
    • 24. 发明授权
    • Real-time kinematic initialization test system
    • 实时运动初始化测试系统
    • US5748145A
    • 1998-05-05
    • US759407
    • 1996-12-04
    • Nicholas C. TalbotMichael T. AllisonPeter Griffioen
    • Nicholas C. TalbotMichael T. AllisonPeter Griffioen
    • G01C15/00G01S5/14G01S19/48G01S5/02G01C21/00
    • G01S19/04G01C15/00G01S19/09G01S19/44
    • A real-time kinematic system includes base and rover GPS units connected by a data link. The rover unit is typically moved to points of interest during a survey while the base remains over a fixed, and known location. An initialization testing program of the present invention is mounted on a personal computer platform that forces in the rover a loss of signal tracking, thus simulating losses in signal reception caused by obstructions of the satellite signals. A complete initialization is forced to occur. The test program uninitializes the RTK solution by causing a loss of integer ambiguities resolution by forcing a loss of lock on one or more satellites. The test program then monitors the subsequent initialization process, e.g., the time needed to search for phase ambiguity candidates, discovering the prevalent satellite geometry, determination of whether the correct ambiguity candidate was found, finding the ratio of the second best to best solution variances of the ambiguity candidates in the list throughout the candidate propagation process or similar statistical test, computing the RMS error of the solution at the time that initialization was declared and after initialization, and calculating the baseline vector between the rover and base at the time of initialization and after initialization. All such statistical parameters are logged and used in post and real-time analyses of the initialization algorithm.
    • 实时运动系统包括通过数据链路连接的基站和流动站GPS单元。 流动站单元通常在测量期间移动到感兴趣点,而基座保持在固定的和已知位置上。 本发明的初始化测试程序被安装在个人计算机平台上,其迫使流动站中的信号跟踪丢失,从而模拟由卫星信号的障碍引起的信号接收中的损失。 一个完整的初始化被迫发生。 测试程序通过强制一个或多个卫星上的锁定丢失导致整数模糊度分辨率的损失来初始化RTK解决方案。 测试程序然后监视随后的初始化过程,例如搜索相位模糊候选所需的时间,发现普遍的卫星几何,确定是否找到正确的模糊性候选,找到第二最佳解与最佳解的方差的比率 在候选传播过程中的列表中的歧义候选者或类似的统计测试,在初始化时初始化之后计算解决方案的RMS误差,并且在初始化时计算流动站和基站之间的基线向量,以及 初始化后。 所有这些统计参数被记录并用于初始化算法的后期和实时分析。
    • 25. 发明授权
    • Real-time kinematic initialization test system
    • 实时运动初始化测试系统
    • US5610614A
    • 1997-03-11
    • US528506
    • 1995-09-13
    • Nicholas C. TalbotMichael T. AllisonPeter Griffioen
    • Nicholas C. TalbotMichael T. AllisonPeter Griffioen
    • G01C15/00G01S5/14G01S19/48H04B7/185G01C21/00G01S5/02H04B17/00
    • G01S19/04G01C15/00G01S19/09G01S19/44
    • A real-time kinematic system includes base and rover GPS units connected by a data link. The rover unit is typically moved to points of interest during a survey while the base remains over a fixed, and known location. An initialization testing program of the present invention is mounted on a personal computer platform that forces in the rover a loss of signal tracking, thus simulating losses in signal reception caused by obstructions of the satellite signals. A complete initialization is forced to occur. The test program uninitializes the RTK solution by causing a loss of integer ambiguities resolution by forcing a loss of lock on one or more satellites. The test program then monitors the subsequent initialization process, e.g., the time needed to search for phase ambiguity candidates, discovering the prevalent satellite geometry, determination of whether the correct ambiguity candidate was found, finding the ratio of the second best to best solution variances of the ambiguity candidates in the list throughout the candidate propagation process or similar statistical test, computing the RMS error of the solution at the time that initialization was declared and after initialization, and calculating the baseline vector between the rover and base at the time of initialization and after initialization. All such statistical parameters are logged and used in post and real-time analyses of the initialization algorithm.
    • 实时运动系统包括通过数据链路连接的基站和流动站GPS单元。 流动站单元通常在测量期间移动到感兴趣点,而基座保持在固定的和已知位置上。 本发明的初始化测试程序被安装在个人计算机平台上,其迫使流动站中的信号跟踪丢失,从而模拟由卫星信号的障碍引起的信号接收中的损失。 一个完整的初始化被迫发生。 测试程序通过强制一个或多个卫星上的锁定丢失导致整数模糊度分辨率的损失来初始化RTK解决方案。 测试程序然后监视随后的初始化过程,例如搜索相位模糊候选所需的时间,发现普遍的卫星几何,确定是否找到正确的模糊性候选,找到第二最佳解与最佳解的方差的比率 在候选传播过程中的列表中的歧义候选者或类似的统计测试,在初始化时初始化之后计算解决方案的RMS误差,并且在初始化时计算流动站和基站之间的基线向量,以及 初始化后。 所有这些统计参数被记录并用于初始化算法的后期和实时分析。