公开(公告)号：US09477865B2

公开(公告)日：2016-10-25

申请号：US14106368

申请日：2013-12-13

Applicant: SYMBOL TECHNOLOGIES, INC.

Inventor： Michael J Koch ,  Benjamin J Bekritsky ,  Alexander M Jacques ,  Charles B Swope

IPC: G06K7/10 ,  G01S13/75 ,  G01S13/82 ,  G01S3/46 ,  G01S3/16

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

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US09836630B2

公开(公告)日：2017-12-05

申请号：US14230482

申请日：2014-03-31

Applicant: SYMBOL TECHNOLOGIES, INC.

Inventor： Benjamin J Bekritsky ,  Alexander M Jacques ,  Michael J Koch ,  Charles B Swope

IPC: G01S3/46 ,  G06K7/10 ,  G01S13/75 ,  G01S13/82 ,  G01S3/16

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

Abstract: An RFID tag reading system and method accurately and rapidly 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 to each tag, by steering a primary receive beam at a primary steering angle from each tag, by steering a plurality of secondary receive beams at different secondary steering angles that are offset from the primary steering angle by receiving secondary receive signals from each tag, and by processing the secondary receive signals to determine a true bearing for each tag. Bidirectional communication between the reader and a tag is conducted over a single inventory round in which the tag is read a plurality of times by the primary and the secondary receive beams.

公开(公告)号：US09797979B2

公开(公告)日：2017-10-24

申请号：US14509211

申请日：2014-10-08

Applicant: SYMBOL TECHNOLOGIES, INC.

Inventor： Charles B Swope ,  Benjamin J Bekritsky

IPC: H01Q3/00 ,  G01S3/28 ,  G06K7/10 ,  G01S13/68 ,  G01S13/75 ,  G01S13/87 ,  G01S3/04 ,  G01S3/40

CPC classification number: G01S3/28 ,  G01S3/046 ,  G01S3/40 ,  G01S13/68 ,  G01S13/75 ,  G01S13/878 ,  G06K7/10099

Abstract: 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.