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1. 发明授权

US06289280B1 Method and apparatus for determining an algebraic solution to GPS terrestrial hybrid location system equations 有权
标题翻译：用于确定GPS地面混合定位系统方程的代数解的方法和装置
公开(公告)号：US06289280B1
公开(公告)日：2001-09-11
申请号：US09460180
申请日：1999-12-10
申请人： Ivan J. Fernandez-Corbaton , Alkinoos Hector Vayanos , Parag A. Agashe , Samir S. Soliman
发明人： Ivan J. Fernandez-Corbaton , Alkinoos Hector Vayanos , Parag A. Agashe , Samir S. Soliman
IPC分类号： G06G778
CPC分类号： G01S19/46 , G01S19/22
摘要： A method and apparatus for use in a hybrid position location system. The method and apparatus combines measurements from Global Positioning System (GPS) and terrestrial transceiver stations to compute the location of a device. An algebraic solution to hybrid position location system equations is output from the method and apparatus. The method and apparatus determines the position of a device using a non-iterative method, as against the use of a conventional iterative least mean square method. The method of the present invention can be used to solve the location system equations in scenarios where a non-iterative solution is desirable. In certain scenarios, the location system equations may have two possible solutions. An iterative method would converge on one of the solutions, without any indication of the existence of the other ambiguous solution. Moreover, the iterative method may converge on the incorrect of the two ambiguous solutions. Use of the presently disclosed method and apparatus yields both the ambiguous solutions. The disclosed method may be followed up with iterative methods, using the solutions from the algebraic method as initial estimates of the device location for the iterative method. A different process can then select the correct solution. Thus, the algebraic method can be used to detect the existence of ambiguous solutions, and to find both solutions.
摘要翻译：一种用于混合位置定位系统的方法和装置。该方法和装置将来自全球定位系统（GPS）和地面收发台的测量结合在一起，以计算设备的位置。从方法和装置输出混合位置定位系统方程的代数解。方法和装置使用非迭代方法来确定装置的位置，与使用传统的迭代最小均方法相比。本发明的方法可用于在需要非迭代解的情况下解决位置系统方程。在某些情况下，定位系统方程可能有两种可能的解决方案。迭代方法会收敛于其中一个解，而没有任何指示存在其他不明确的解决方案。此外，迭代方法可能会收敛于两个模糊解的不正确。使用本公开的方法和装置产生两个不明确的解决方案。所公开的方法可以跟随迭代方法，使用来自代数方法的解决方案作为用于迭代方法的设备位置的初始估计。然后，不同的过程可以选择正确的解决方案。因此，代数方法可以用于检测模糊解的存在，并找到两种解决方案。

2. 发明授权

US07085537B2 System and method for the detection and compensation of radio signal time of arrival errors 失效
公开(公告)号：US07085537B2
公开(公告)日：2006-08-01
申请号：US10932511
申请日：2004-09-01
申请人： Ivan J. Fernandez-Corbaton , Roland Rick , Messay Amerga
发明人： Ivan J. Fernandez-Corbaton , Roland Rick , Messay Amerga
IPC分类号： H04B1/00
CPC分类号： G01S19/22 , G01S5/0215 , G01S5/0273 , G01S5/10 , G01S19/40 , G01S19/42 , G01S19/428 , G01S19/46 , H04B1/1081 , H04B1/711 , H04B1/7117 , H04W24/00 , H04W84/06
摘要： A system and method are disclosed by which the effects of time of arrival errors may be reduced. In a mobile unit, such as a CDMA device, a correlation pulse is generated when a transmitted code matches a stored reference code. In the absence of multipath effects, correlation pulses are generated in response to the detection of multiple transmissions of the reference code from multiple transmitters. However, multipath effects distort the generated correlation pulses leading to errors in the time of arrival measurements. The present invention calculates the width of the correlation pulses and determines a delay correction factor based on the pulse width. The delay correction factor is added to the measured delay time to provide a more accurate delay time, thus permitting more accurate location measurements based on time of arrival. In alternative embodiments, other signal factors may also be used to apply delay correction factors. The actual location determination may be performed by the mobile unit, or any other positioning determining entity (PDE). The system is also capable of applying correction factors to time of arrival signals received from global positioning system (GPS) satellites.

3. 发明授权

US06804494B2 System and method for the detection and compensation of radio signal time of arrival errors 失效
标题翻译：用于检测和补偿无线电信号到达时间错误的系统和方法
公开(公告)号：US06804494B2
公开(公告)日：2004-10-12
申请号：US09879074
申请日：2001-06-11
申请人： Ivan J. Fernandez-Corbaton , Roland Rick , Messay Amerga
发明人： Ivan J. Fernandez-Corbaton , Roland Rick , Messay Amerga
IPC分类号： H04B110
CPC分类号： G01S19/22 , G01S5/0215 , G01S5/0273 , G01S5/10 , G01S19/40 , G01S19/42 , G01S19/428 , G01S19/46 , H04B1/1081 , H04B1/711 , H04B1/7117 , H04W24/00 , H04W84/06
摘要： A system and method are disclosed by which the effects of time of arrival errors may be reduced. In a mobile unit, such as a CDMA device, a correlation pulse is generated when a transmitted code matches a stored reference code. In the absence of multipath effects, correlation pulses are generated in response to the detection of multiple transmissions of the reference code from multiple transmitters. However, multipath effects distort the generated correlation pulses leading to errors in the time of arrival measurements. The present invention calculates the width of the correlation pulses and determines a delay correction factor based on the pulse width. The delay correction factor is added to the measured delay time to provide a more accurate delay time, thus permitting more accurate location measurements based on time of arrival. In alternative embodiments, other signal factors may also be used to apply delay correction factors. The actual location determination may be performed by the mobile unit, or any other positioning determining entity (PDE). The system is also capable of applying correction factors to time of arrival signals received from global positioning system (GPS) satellites.
摘要翻译：公开了一种可以减少到达时间错误的影响的系统和方法。在诸如CDMA设备的移动单元中，当发送的码与存储的参考码匹配时，产生相关脉冲。在没有多路径效应的情况下，响应于来自多个发射机的参考码的多次传输的检测而产生相关脉冲。然而，多路径效应使所产生的相关脉冲失真导致到达时间测量的错误。本发明计算相关脉冲的宽度，并且基于脉冲宽度确定延迟校正因子。将延迟校正因子加到测量的延迟时间上，以提供更精确的延迟时间，从而根据到达时间进行更准确的位置测量。在替代实施例中，也可以使用其他信号因子来应用延迟校正因子。实际位置确定可以由移动单元或任何其他定位确定实体（PDE）执行。该系统还能够对从全球定位系统（GPS）卫星接收的到达时间信号应用校正因子。

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