公开(公告)号：US20160103198A1

公开(公告)日：2016-04-14

申请号：US14509211

申请日：2014-10-08

申请人： SYMBOL TECHNOLOGIES, INC.

发明人： Charles B. Swope ,  Benjamin J. Bekritsky

IPC分类号： G01S3/28 ,  G01S3/04

CPC分类号： G01S3/28 ,  G01S3/046 ,  G01S3/40 ,  G01S13/68 ,  G01S13/75 ,  G01S13/878 ,  G06K7/10099

摘要： An RFID tag reading system and method estimate bearings of RFID tags. When the RSSI of a primary and/or secondary RFID receive signal is below a threshold, a primary receive beam is steered in a limited scan to an array of locations distributed around the location at which the RSSI of the primary receive signal is a maximum, and the RSSI of the primary receive signal is recorded at each location. The recorded RSSIs are processed to determine an effective weighted center of distribution of the recorded RSSIs, and the bearing for the tag based on the weighted center of distribution is thus estimated.

摘要翻译： RFID标签读取系统和方法估计RFID标签的轴承。 当初级和/或次级RFID接收信号的RSSI低于阈值时，将主要接收波束以受限扫描的方式转向分布在主接收信号的RSSI为最大值的位置周围的位置阵列， 并且在每个位置记录主要接收信号的RSSI。 处理所记录的RSSI以确定记录的RSSI的有效加权分布中心，因此估计基于加权分布中心的标签的方位。

公开(公告)号：US09111190B2

公开(公告)日：2015-08-18

申请号：US13742768

申请日：2013-01-16

申请人： SYMBOL TECHNOLOGIES, INC.

发明人： Alexander M. Jacques ,  Benjamin J. Bekritsky ,  Michael J. Koch

IPC分类号： H04Q5/22 ,  G08B13/14 ,  G01S3/02 ,  G01S13/00 ,  H01Q3/00 ,  G06K19/07 ,  G01S3/28 ,  G01S13/75 ,  G01S3/32 ,  G01S3/74 ,  G01S13/76 ,  G01S13/02

CPC分类号： G06K19/0723 ,  G01S3/28 ,  G01S3/32 ,  G01S3/74 ,  G01S13/751 ,  G01S13/762 ,  G01S2013/0245

摘要： A radio frequency identification (RFID) tag reading system having a phased antenna array accurately locates RFID tags in a controlled area, by steering an interrogating beam over the controlled area to interrogate the tags and generate return modulated RF signals. A primary receiver steers a primary receive beam at a primary steering angle that is fixed during each tag interrogation. A primary demodulator demodulates and reconstructs the received return modulated signals. A secondary receiver, independently of the primary receiver, steers a secondary receive beam at a plurality of secondary steering angles. A secondary correlator/demodulator demodulates the combined return modulated signals, and utilizes the reconstructed signal reconstructed by the primary demodulator at each of the secondary steering angles. Both the primary and the secondary receivers cooperate to accurately locate the same tag.

摘要翻译： 具有相控天线阵列的射频识别（RFID）标签读取系统通过在受控区域上引导询问光束来对RFID标签进行精确定位，从而询问标签并产生返回调制的RF信号。 主接收器以主要转向角转向主接收波束，该主转向角在每个标签询问期间被固定。 主解调器解调并重建接收到的返回调制信号。 独立于主接收器的次级接收器以多个次级转向角度引导次级接收波束。 二次相关器/解调器解调组合的返回调制信号，并且利用由主解调器在每个次级转向角重构的重构信号。 主接收机和辅助接收机都配合以准确定位相同的标签。

公开(公告)号：US20150169910A1

公开(公告)日：2015-06-18

申请号：US14106368

申请日：2013-12-13

申请人： SYMBOL TECHNOLOGIES, INC.

发明人： Michael J. Koch ,  Benjamin J. Bekritsky ,  Alexander M. Jacques ,  Charles B. Swope

IPC分类号： G06K7/10

CPC分类号： G06K7/10415 ,  G01S3/16 ,  G01S3/46 ,  G01S13/75 ,  G01S13/751 ,  G01S13/825 ,  G06K7/10099 ,  G06K7/10128 ,  G06K7/10366

摘要： A radio frequency (RF) identification (RFID) tag reading system and method accurately determine true bearings of RFID tags associated with items in a controlled area. An RFID reader has an array of antenna elements and a plurality of RF transceivers. A controller controls the transceivers by steering a primary transmit beam over the controlled area by transmitting a primary transmit signal to each tag, and steering a primary receive beam at a primary steering angle by receiving a primary receive signal from each tag. The controller thereupon steers a plurality of secondary receive offset beams at different secondary steering angles that are offset from the primary steering angle by receiving secondary receive offset signals from each tag, and by processing the offset signals to determine a true bearing for each tag.

摘要翻译： 射频识别（RFID）标签读取系统和方法准确地确定与受控区域中的项目相关联的RFID标签的真实轴承。 RFID读取器具有天线元件阵列和多个RF收发器。 控制器通过将主要发射信号发送到每个标签，并通过从主要转向角度接收来自每个标签的主要接收信号来控制主要接收波束来控制受控区域上的主要发射波束来控制收发器。 控制器随后通过接收来自每个标签的次级接收偏移信号，并且通过处理偏移信号来确定每个标签的真实方位，引导不同次级转向角处的多个副接收偏移波束偏离主转向角。