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公开(公告)号：US08199050B2
公开(公告)日：2012-06-12
申请号：US13240964
申请日：2011-09-22
IPC分类号： G01S19/45
CPC分类号： G01S19/46
摘要： A method and apparatus for position determination is provided using measurements from both Global Positioning System (GPS) receivers and terrestrial-based Uplink Time Difference of Arrival (UTDOA) receivers. The method involves the transformation of downlink satellite measurements into equivalent UTDOA measurements by computing comparable cross-correlation coefficients and time differences of arrival with respect to a UTDOA reference station. The method includes a weighting operation whereby the relative weights of the UTDOA measurements and the relative weights of the GPS measurements are adjusted based on a theoretical scaling followed by empirical adjustments. The method further involves the efficient computation and combining of metrics that are used to minimize the weighted error between candidate location solutions and the UTDOA and GPS measurements.
摘要翻译： 使用来自全球定位系统（GPS）接收机和基于地面的上行链路到达时差（UTDOA）接收机的测量来提供用于位置确定的方法和装置。 该方法涉及通过计算相对于UTDOA参考站的可比互相关系数和到达时间差来将下行链路卫星测量转换成等效的UTDOA测量。 该方法包括一个加权操作，其中UTDOA测量的相对权重和GPS测量的相对权重基于经验调整后的理论缩放来调整。 该方法还涉及用于最小化候选位置解决方案与UTDOA和GPS测量之间的加权误差的度量的有效计算和组合。
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公开(公告)号：US07924224B2
公开(公告)日：2011-04-12
申请号：US12192842
申请日：2008-08-15
CPC分类号： G01S5/0221 , G01S5/04 , G01S5/06 , H04W64/00
摘要： In a network-based Wireless Location System (WLS), geographically distributed Location Measurement Units (LMUs) must be able to detect and use reverse channel (mobile to network) signals across multiple BTS coverage areas. By using Matched Replica correlation processing with the local and reference signals subdivided into discrete segments prior to correlation, the effects of mobile clock drift and Doppler shifts can be mitigated allowing for increased processing gain.
摘要翻译： 在基于网络的无线定位系统（WLS）中，地理分布的位置测量单元（LMU）必须能够跨多个BTS覆盖区域检测和使用反向信道（移动到网络）信号。 通过使用匹配副本相关处理与在相关之前被分成离散段的本地参考信号和参考信号，可以减轻移动时钟漂移和多普勒频移的影响，从而允许增加的处理增益。
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公开(公告)号：US20100039326A1
公开(公告)日：2010-02-18
申请号：US12192842
申请日：2008-08-15
IPC分类号： G01S3/02
CPC分类号： G01S5/0221 , G01S5/04 , G01S5/06 , H04W64/00
摘要： In a network-based Wireless Location System (WLS), geographically distributed Location Measurement Units (LMUs) must be able to detect and use reverse channel (mobile to network) signals across multiple BTS coverage areas. By using Matched Replica correlation processing with the local and reference signals subdivided into discrete segments prior to correlation, the effects of mobile clock drift and Doppler shifts can be mitigated allowing for increased processing gain.
摘要翻译： 在基于网络的无线定位系统（WLS）中，地理分布的位置测量单元（LMU）必须能够跨多个BTS覆盖区域检测和使用反向信道（移动到网络）信号。 通过使用匹配副本相关处理与在相关之前被分成离散段的本地参考信号和参考信号，可以减轻移动时钟漂移和多普勒频移的影响，从而允许增加的处理增益。
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公开(公告)号：US20080261614A1
公开(公告)日：2008-10-23
申请号：US11736950
申请日：2007-04-18
IPC分类号： H04Q7/20
摘要： In an overlay, U-TDOA-based, Wireless Location System, LMUs typically co-located with BTSs, are used to collect radio signaling both in the forward and reverse channels. Techniques are used to compensate for sparse LMU deployments where sections of the U-TDOA service area are uplink demodulation or downlink beacon discovery limited.
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公开(公告)号：US20120015670A1
公开(公告)日：2012-01-19
申请号：US13240964
申请日：2011-09-22
IPC分类号： H04W64/00
CPC分类号： G01S19/46
摘要： A method and apparatus for position determination is provided using measurements from both Global Positioning System (GPS) receivers and terrestrial-based Uplink Time Difference of Arrival (UTDOA) receivers. The method involves the transformation of downlink satellite measurements into equivalent UTDOA measurements by computing comparable cross-correlation coefficients and time differences of arrival with respect to a UTDOA reference station. The method includes a weighting operation whereby the relative weights of the UTDOA measurements and the relative weights of the GPS measurements are adjusted based on a theoretical scaling followed by empirical adjustments. The method further involves the efficient computation and combining of metrics that are used to minimize the weighted error between candidate location solutions and the UTDOA and GPS measurements.
摘要翻译： 使用来自全球定位系统（GPS）接收机和基于地面的上行链路到达时差（UTDOA）接收机的测量来提供用于位置确定的方法和装置。 该方法涉及通过计算相对于UTDOA参考站的可比互相关系数和到达时间差来将下行链路卫星测量转换成等效的UTDOA测量。 该方法包括一个加权操作，其中UTDOA测量的相对权重和GPS测量的相对权重基于经验调整后的理论缩放来调整。 该方法还涉及用于最小化候选位置解决方案与UTDOA和GPS测量之间的加权误差的度量的有效计算和组合。
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6.发明申请Detection of Time of Arrival of CDMA Signals in a Wireless Location System 有权CDMA无线定位系统中CDMA信号到达时间的检测公开(公告)号：US20090149132A1
公开(公告)日：2009-06-11
申请号：US11953585
申请日：2007-12-10
IPC分类号： H04B17/00
CPC分类号： H04B1/7075 , G01S5/0215 , G01S5/06 , H04B17/27 , H04B17/391
摘要： In a Wireless Location System (WLS) deployed in connection with a CDMA-based wireless communications system, Location Measurement Units are used to collect multi-path corrupted radio signaling for use in time difference of arrival (TDOA) and hybrid positioning methods. Signal processing techniques are used to enhance the WLS's ability to determine the minimally time-delayed multi-path component and thus increase the accuracy of the TDOA location in CDMA-based wireless communications systems. The signal processing includes a filtering technique for reducing the leading sidelobes of the cross-correlation function as well as a leading edge discovery procedure.
摘要翻译： 在与基于CDMA的无线通信系统相结合的无线定位系统（Wireless Location System，WLS）中，使用位置测量单元收集多路径损坏的无线电信令，用于到达时差（TDOA）和混合定位方法。 信号处理技术用于提高WLS确定最小时延多径分量的能力，从而提高基于CDMA的无线通信系统中TDOA位置的准确性。 信号处理包括用于减少互相关函数的前导旁瓣以及前沿发现过程的滤波技术。
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公开(公告)号：US20080261611A1
公开(公告)日：2008-10-23
申请号：US11736868
申请日：2007-04-18
IPC分类号： H04Q7/20
摘要： In an overlay, U-TDOA-based, Wireless Location System, LMUs typically co-located with BTSs, are used to collect radio signaling both in the forward and reverse channels. Techniques are used to compensate for sparse LMU deployments where sections of the U-TDOA service area are uplink demodulation or downlink beacon discovery limited.
摘要翻译： 在覆盖层中，基于U-TDOA的无线定位系统，通常与BTS共处的LMU用于在前向和反向信道中收集无线电信令。 技术用于补偿在U-TDOA服务区域的部分是上行链路解调或下行链路信标发现受限的稀疏LMU部署。
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公开(公告)号：US08059028B2
公开(公告)日：2011-11-15
申请号：US12192057
申请日：2008-08-14
IPC分类号： G01S19/46
CPC分类号： G01S19/46
摘要： A method and apparatus for position determination is provided using measurements from both Global Positioning System (GPS) receivers and terrestrial-based Uplink Time Difference of Arrival (UTDOA) receivers. The method involves the transformation of downlink satellite measurements into equivalent UTDOA measurements by computing comparable cross-correlation coefficients and time differences of arrival with respect to a UTDOA reference station. The method includes a weighting operation whereby the relative weights of the UTDOA measurements and the relative weights of the GPS measurements are adjusted based on a theoretical scaling followed by empirical adjustments. The method further involves the efficient computation and combining of metrics that are used to minimize the weighted error between candidate location solutions and the UTDOA and GPS measurements. This is done efficiently in two dimensions for UTDOA and in three dimensions for GPS measurements by increasing the complexity of searching operations as the optimal location solution is approached. A technique is also described that improves upon a particular location solution by changing the measurement weightings using criteria specific to GPS and UTDOA.
摘要翻译： 使用来自全球定位系统（GPS）接收机和基于地面的上行链路到达时差（UTDOA）接收机的测量来提供用于位置确定的方法和装置。 该方法涉及通过计算相对于UTDOA参考站的可比互相关系数和到达时间差来将下行链路卫星测量转换成等效的UTDOA测量。 该方法包括一个加权操作，其中UTDOA测量的相对权重和GPS测量的相对权重基于经验调整后的理论缩放来调整。 该方法还涉及用于最小化候选位置解决方案与UTDOA和GPS测量之间的加权误差的度量的有效计算和组合。 对于UTDOA，这在二维方面有效地进行，并且通过在接近最佳位置解决方案时通过增加搜索操作的复杂度来进行GPS测量。 还描述了一种技术，其通过使用针对GPS和UTDOA的标准改变测量权重来改进特定位置解决方案。
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公开(公告)号：US08045506B2
公开(公告)日：2011-10-25
申请号：US11736868
申请日：2007-04-18
IPC分类号： H04Q11/00
摘要： In an overlay, U-TDOA-based, Wireless Location System, LMUs typically co-located with BTSs, are used to collect radio signaling both in the forward and reverse channels. Techniques are used to compensate for sparse LMU deployments where sections of the U-TDOA service area are uplink demodulation or downlink beacon discovery limited.
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10.发明授权公开(公告)号：US07667649B2
公开(公告)日：2010-02-23
申请号：US11953585
申请日：2007-12-10
IPC分类号： G01S3/02
CPC分类号： H04B1/7075 , G01S5/0215 , G01S5/06 , H04B17/27 , H04B17/391
摘要： In a Wireless Location System (WLS) deployed in connection with a CDMA-based wireless communications system, Location Measurement Units are used to collect multi-path corrupted radio signaling for use in time difference of arrival (TDOA) and hybrid positioning methods. Signal processing techniques are used to enhance the WLS's ability to determine the minimally time-delayed multi-path component and thus increase the accuracy of the TDOA location in CDMA-based wireless communications systems. The signal processing includes a filtering technique for reducing the leading sidelobes of the cross-correlation function as well as a leading edge discovery procedure.
摘要翻译： 在与基于CDMA的无线通信系统相结合的无线定位系统（Wireless Location System，WLS）中，使用位置测量单元收集多路径损坏的无线电信令，用于到达时差（TDOA）和混合定位方法。 信号处理技术用于提高WLS确定最小时延多径分量的能力，从而提高基于CDMA的无线通信系统中TDOA位置的准确性。 信号处理包括用于减少互相关函数的前导旁瓣以及前沿发现过程的滤波技术。
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