公开(公告)号：US10942248B2

公开(公告)日：2021-03-09

申请号：US16385909

申请日：2019-04-16

Applicant: ZEBRA TECHNOLOGIES CORPORATION

Inventor： Edward A. Richley ,  Belinda Turner ,  Chang Wang

IPC: G01S5/06 ,  H04L12/24 ,  H04B1/16 ,  H04W4/029 ,  G01S5/02 ,  H04W4/02

Abstract: An example method includes receiving environmental data from a plurality of receivers; calculating, using a processor, an environmental offset based on the environmental data, wherein the environmental offset is operable to adjust a reference phase offset; and dynamically adjusting the environmental offset in response to a detected change in the environmental data.

公开(公告)号：US10310052B2

公开(公告)日：2019-06-04

申请号：US15492537

申请日：2017-04-20

Applicant: Zebra Technologies Corporation

Inventor： Edward A. Richley ,  Belinda Turner ,  Chang Wang

IPC: H04W4/02 ,  G01S5/06 ,  H04L12/24 ,  H04B1/16 ,  G01S5/02

Abstract: Systems, methods, apparatuses, and computer readable media are disclosed for improving, in some examples, reference in a location system. In one embodiment, a method is provided comprising: receiving reference tag blink data from a plurality of receivers; calculating, using a processor, a reference phase offset between the plurality of receivers; and generating a suspended reference phase offset table, wherein a suspended reference phase offset table is generated by causing the reference phase offset to be stored in a memory for later tag location calculations.

公开(公告)号：US10261169B2

公开(公告)日：2019-04-16

申请号：US14729761

申请日：2015-06-03

Applicant: Zebra Technologies Corporation

Inventor： Edward A. Richley ,  Belinda Turner ,  Chang Wang

IPC: H04W24/00 ,  G01S5/06 ,  G01S5/02

Abstract: The present invention provides methods for an active RFID tag target location system that provides for an iterative recalculating of a target location estimate by successively testing receiver TOA and DTOA error measurements and discarding outlier receivers. The present invention works to reduce the erratic effects that multipath channel interference and random noise play in target location systems due to incorrect identification of the main pulse of the transmit signal. In addition to providing for a greater accuracy and consistency in a TOA-based target location system, the method also provides for an opportunity to reduce a transmission bandwidth associate with the TOA transmission by the multiple receivers. The method may be considered a post-processing element, as the determination of TOA and DTOA may require a real-time calculation, where the timing constraints for the ensuing target location estimate may be less severe.

公开(公告)号：US20190178981A1

公开(公告)日：2019-06-13

申请号：US16279410

申请日：2019-02-19

Applicant: ZEBRA TECHNOLOGIES CORPORATION

Inventor： Edward A. Richley ,  Belinda Turner ,  Chang Wang

IPC: G01S5/06 ,  G01S5/02

CPC classification number: G01S5/06 ,  G01S5/02 ,  G01S5/0215 ,  G01S5/0221

Abstract: An disclosed method includes receiving, from receivers, TOA data associated with location tag transmissions; determining a first set of the receivers based on the received TOA data; calculating a first tag location estimate for the first set of the receivers by applying a minimizing function to a first set of the TOA data corresponding to the first set of the receivers; determining a first data quality indicator (DQI) for the first tag location estimate; and when the first DQI for the first tag location estimate does not meet a threshold: determining, for the first set of the TOA data, impacts of respective delays on the minimizing function; determining, based on the impacts of the respective delays on the minimizing function, a second set the receivers different from the first set of the receivers; and calculating a second tag location estimate for the second set of the receivers.

公开(公告)号：US10285157B2

公开(公告)日：2019-05-07

申请号：US15803713

申请日：2017-11-03

Applicant: Zebra Technologies Corporation

Inventor： Edward A. Richley ,  Belinda Turner ,  Chang Wang ,  Aitan Ameti

IPC: H04W64/00 ,  H04W4/02 ,  H04W24/10 ,  H04L7/033 ,  G01S5/02

Abstract: A disclosed example apparatus receives a tag transmission signal from a tag at a receiver, wherein the tag transmission signal comprises a series of pulses; determines a coarse estimate of a time-of-arrival (TOA) of the tag transmission signal based on a detection of a pulse of the series of pulses in an adjustable coarse timing window, wherein the coarse estimate is based on a plurality of coarse timing windows; determines a fine estimate of the TOA based on a detection of the pulse in at least one of a parallel set of fine timing windows; and determines a sub-window resolution of the TOA based on at least one detection transition between consecutive fine receiver windows of at least one of a plurality of pulses and a weighted average of the TOA for each pulse of the series of pulses.

公开(公告)号：US10520582B2

公开(公告)日：2019-12-31

申请号：US16279410

申请日：2019-02-19

Applicant: ZEBRA TECHNOLOGIES CORPORATION

Inventor： Edward A. Richley ,  Belinda Turner ,  Chang Wang

IPC: H04W64/00 ,  G01S5/06 ,  G01S5/02

Abstract: An disclosed method includes receiving, from receivers, TOA data associated with location tag transmissions; determining a first set of the receivers based on the received TOA data; calculating a first tag location estimate for the first set of the receivers by applying a minimizing function to a first set of the TOA data corresponding to the first set of the receivers; determining a first data quality indicator (DQI) for the first tag location estimate; and when the first DQI for the first tag location estimate does not meet a threshold: determining, for the first set of the TOA data, impacts of respective delays on the minimizing function; determining, based on the impacts of the respective delays on the minimizing function, a second set the receivers different from the first set of the receivers; and calculating a second tag location estimate for the second set of the receivers.

公开(公告)号：US20190242969A1

公开(公告)日：2019-08-08

申请号：US16385909

申请日：2019-04-16

Applicant: ZEBRA TECHNOLOGIES CORPORATION

Inventor： Edward A. Richley ,  Belinda Turner ,  Chang Wang

IPC: G01S5/06 ,  G01S5/02 ,  H04W4/02 ,  H04L12/24 ,  H04B1/16

CPC classification number: G01S5/06 ,  G01S5/021 ,  G01S5/0236 ,  H04B1/16 ,  H04L41/0803 ,  H04W4/02 ,  H04W4/029

Abstract: An example method includes receiving environmental data from a plurality of receivers; calculating, using a processor, an environmental offset based on the environmental data, wherein the environmental offset is operable to adjust a reference phase offset; and dynamically adjusting the environmental offset in response to a detected change in the environmental data.