公开(公告)号：US20050261004A1

公开(公告)日：2005-11-24

申请号：US10848276

申请日：2004-05-18

申请人： Paul Dietrich ,  Gregg Davi ,  Robert Friday

发明人： Paul Dietrich ,  Gregg Davi ,  Robert Friday

IPC分类号： G01S19/06 ,  H04W24/00 ,  H04W64/00 ,  H04Q7/20

CPC分类号： G01S5/02 ,  G01S5/0252 ,  H04W24/00 ,  H04W64/00

摘要： A wireless node location mechanism that defines a search region to optimize the computations associated with estimating the location of a given wireless node. According to one implementation, a coverage map associated with each radio receiver that records signal strength data is defined out to a threshold signal strength level. Before computing the estimated location of a given wireless nodes, a search region is defined based on the intersection of the coverage maps associated with each radio receiver that detects the wireless node. Some implementations use information provided by the fact that certain radio receivers did not detect the wireless node to further optimize the location estimate. By defining a search region, which is a generally small area relative to the space encompassed by an entire RF environment, the present invention provides several advantages, such as reducing the processing time and/or power to compute estimated locations for wireless nodes.

摘要翻译： 无线节点定位机制，其定义搜索区域以优化与估计给定无线节点的位置相关联的计算。 根据一个实施方式，将与记录信号强度数据的每个无线电接收机相关联的覆盖图定义为阈值信号强度水平。 在计算给定无线节点的估计位置之前，基于与检测无线节点的每个无线电接收机相关联的覆盖图的交集来定义搜索区域。 一些实现使用由某些无线电接收机没有检测到无线节点以进一步优化位置估计的事实提供的信息。 通过定义搜索区域，其是相对于由整个RF环境所包含的空间的一般小的区域，本发明提供了若干优点，例如减少处理时间和/或功率来计算无线节点的估计位置。

公开(公告)号：US20050195109A1

公开(公告)日：2005-09-08

申请号：US10794842

申请日：2004-03-05

申请人： Gregg Davi ,  Paul Dietrich ,  Alexander Hills

发明人： Gregg Davi ,  Paul Dietrich ,  Alexander Hills

IPC分类号： G01S3/02

CPC分类号： G01S5/0252 ,  G01S5/0226 ,  G01S5/14 ,  G01S11/06

摘要： A wireless node location mechanism that dynamically adapts to changes to a surrounding physical environment that affect the propagation of radio signals. The wireless node location mechanism assesses radio signals from transmitters associated with a wireless node location infrastructure to adjust one or more parameters used to estimate location of a wireless node. In one implementation, path loss exponents are re-computed based on the signals transmitted between infrastructure radio transceivers. These path loss exponents are used, in one implementation, to compute the distance between a wireless node and a given infrastructure radio transceiver and, ultimately, to determine the location of the wireless node based on triangulation. In one implementation, path loss exponents are computed on demand based on the signals observed between infrastructure radios that detect the wireless node whose location is to be estimated.

摘要翻译： 一种无线节点定位机制，其动态地适应影响无线电信号传播的周围物理环境的变化。 无线节点定位机构评估来自与无线节点位置基础设施相关联的发射机的无线电信号，以调整用于估计无线节点位置的一个或多个参数。 在一个实现中，基于在基础设施无线电收发器之间传输的信号重新计算路径损耗指数。 在一个实现中，使用这些路径损耗指数来计算无线节点与给定的基础设施无线电收发器之间的距离，最终确定基于三角测量的无线节点的位置。 在一个实现中，基于在检测要估计其位置的无线节点的基础设施无线电之间观察到的信号，根据需要计算路径损耗指数。

公开(公告)号：US20080004042A1

公开(公告)日：2008-01-03

申请号：US11854499

申请日：2007-09-12

申请人： Paul Dietrich ,  Gregg Davi

发明人： Paul Dietrich ,  Gregg Davi

IPC分类号： H04M1/00

CPC分类号： H04W64/00

摘要： A wireless node location mechanism that employs a differential signal strength metric to reduce the errors caused by variations in wireless node transmit power, errors in signal strength detection, and/or direction-dependent path loss. As opposed to using the absolute signal strength or power of an RF signal transmitted by a wireless node, implementations of the location mechanism compare the differences between signal strength values detected at various pairs of radio receivers to corresponding differences characterized in a model of the RF environment. One implementation searches for the locations in the model between each pair of radio receivers where their signal strength is different by an observed amount.

摘要翻译： 一种使用差分信号强度度量来减少由无线节点发射功率的变化，信号强度检测中的误差和/或与方向相关的路径损耗引起的误差的无线节点定位机制。 与使用由无线节点发送的RF信号的绝对信号强度或功率相反，位置机制的实现将在各种无线电接收机处检测到的信号强度值之间的差异与在RF环境的模型中表征的相应差异进行比较 。 一个实现方式在每一对无线电接收机之间搜索模型中的信号强度与观测量不同的位置。

公开(公告)号：US20050208952A1

公开(公告)日：2005-09-22

申请号：US10802366

申请日：2004-03-16

申请人： Paul Dietrich ,  Gregg Davi ,  Robert Friday

发明人： Paul Dietrich ,  Gregg Davi ,  Robert Friday

IPC分类号： G01S19/48 ,  G01S5/02 ,  H04W64/00 ,  H04Q7/20

CPC分类号： G01S5/0221 ,  G01S5/0252 ,  H04W4/023 ,  H04W64/00

摘要： Methods, apparatuses, and systems directed to a wireless node location mechanism that uses a signal strength weighting metric to improve the accuracy of estimating the location of a wireless node based on signals detected among a plurality of radio transceivers. In certain implementations, the wireless node location mechanism further incorporates a differential signal strength metric to reduce the errors caused by variations in wireless node transmit power, errors in signal strength detection, and/or direction-dependent path loss. As opposed to using the absolute signal strength or power of an RF signal transmitted by a wireless node, implementations of the present invention compare the differences between signal strength values detected at various pairs of radio receivers to corresponding differences characterized in a model of the RF environment. One implementation of the invention searches for the locations in the model between each pair of radio receivers where their signal strength is different by an observed amount.

摘要翻译： 基于使用信号强度加权度量的无线节点定位机构的方法，装置和系统，其基于在多个无线电收发器中检测到的信号来提高无线节点的位置的准确性。 在某些实现中，无线节点定位机制还包括差分信号强度度量，以减少由无线节点发射功率的变化，信号强度检测中的误差和/或与方向相关的路径损耗引起的误差。 与使用由无线节点发送的RF信号的绝对信号强度或功率相反，本发明的实施方式将在各种无线电接收机检测到的信号强度值之间的差异与RF环境模型相对应的对应差异进行比较 。 本发明的一个实现方式是在每一对无线电接收机之间的模型中搜索其信号强度与观测量不同的位置。