公开(公告)号：CA2581585A1

公开(公告)日：2006-04-13

申请号：CA2581585

申请日：2005-09-22

Applicant: SYMBOL TECHNOLOGIES INC

Inventor： DURON MARK WILLIAM ,  CHARYCH HAL ,  BRIDGELALL RAJ ,  KNADLE RICHARD T JR

IPC: G06K7/08 ,  H01Q5/15 ,  H01Q21/28 ,  H01Q21/30

公开(公告)号：AU2010200808A1

公开(公告)日：2010-03-25

申请号：AU2010200808

申请日：2010-03-03

Applicant: SYMBOL TECHNOLOGIES INC

Inventor： BRIDGELALL RAJ ,  DURON MARK WILLIAM ,  STRZELCZYK MARTIN J

IPC: G01S13/32 ,  G01S13/34 ,  G01S13/87

Abstract: A system and method is provided for locating objects using RFID tags. The system and method uses an RFID reader and a distance calculator to efficiently and accurately determine the location of objects that include an RFID tag. The RFID reader transmits a plurality of signals to the RFID tag, with the plurality of signals having different fundamental frequencies. In response, the RFID tag backscatter modulates the plurality of transmitted signals to create a plurality of backscatter modulated signals. The RFID reader receives and demodulates the plurality of backscatter modulated signals. The distance calculator determines the phase of the plurality of backscatter modulated signals and determines a rate of change of the phase in the backscatter modulated signals with respect to the rate of change in the fundamental frequency of the transmitted signals and uses this information to calculate the distance to the RFID tag.

公开(公告)号：CA2559049A1

公开(公告)日：2005-09-29

申请号：CA2559049

申请日：2005-03-16

Applicant: SYMBOL TECHNOLOGIES INC

Inventor： STRZELCZYK MARTIN J ,  DURON MARK WILLIAM ,  BRIDGELALL RAJ

IPC: G01S19/11 ,  G01S5/14 ,  G01S13/74 ,  G01S13/87 ,  G06K7/00 ,  G06K19/077

Abstract: A multi-resolution object location system and method for locating objects is provided. The multi-resolution system and method uses a long-range object locator together with a more precise RFID locator to efficiently and accurately determine the location of objects that include an RFID tag. The long-range object locator has a relatively longer range and can cover a relatively large area to determine the general location of the object within the large area. The RFID locator has a relatively shorter range, but is able to locate the object more precisely. The object location system uses the long-range locator to first determine the general location of the object, and then the RFID locator is used to determine a more accurate location of the object. Thus, the multi-resolution object location system is able to provide both a long range location of objects over a large area and a precise location of objects.

公开(公告)号：AT385317T

公开(公告)日：2008-02-15

申请号：AT05725799

申请日：2005-03-16

Applicant: SYMBOL TECHNOLOGIES INC

Inventor： BRIDGELALL RAJ ,  DURON MARK WILLIAM ,  STRZELCZYK MARTIN J

IPC: G01S19/11 ,  G01S5/14 ,  G01S13/74 ,  G01S13/87 ,  G06K7/00 ,  G06K19/077

Abstract: A multi-resolution object location system and method for locating objects is provided. The multi-resolution system and method uses a long-range object locator together with a more precise RFID locator to efficiently and accurately determine the location of objects that include an RFID tag. The long-range object locator has a relatively longer range and can cover a relatively large area to determine the general location of the object within the large area. The RFID locator has a relatively shorter range, but is able to locate the object more precisely. The object location system uses the long-range locator to first determine the general location of the object, and then the RFID locator is used to determine a more accurate location of the object. Thus, the multi-resolution object location system is able to provide both a long range location of objects over a large area and a precise location of objects.

公开(公告)号：AU2005218459A1

公开(公告)日：2005-09-15

申请号：AU2005218459

申请日：2005-02-25

Applicant: SYMBOL TECHNOLOGIES INC

Inventor： STRZELCZYK MARTIN J ,  DURON MARK WILLIAM ,  BRIDGELALL RAJ

IPC: G01S13/34 ,  G01S13/32 ,  G01S13/87

Abstract: A system and method is provided for locating objects using RFID tags. The system and method uses an RFID reader and a distance calculator to efficiently and accurately determine the location of objects that include an RFID tag. The RFID reader transmits a plurality of signals to the RFID tag, with the plurality of signals having different fundamental frequencies. In response, the RFID tag backscatter modulates the plurality of transmitted signals to create a plurality of backscatter modulated signals. The RFID reader receives and demodulates the plurality of backscatter modulated signals. The distance calculator determines the phase of the plurality of backscatter modulated signals and determines a rate of change of the phase in the backscatter modulated signals with respect to the rate of change in the fundamental frequency of the transmitted signals and uses this information to calculate the distance to the RFID tag.

公开(公告)号：AU2005292331A1

公开(公告)日：2006-04-13

申请号：AU2005292331

申请日：2005-09-22

Applicant: SYMBOL TECHNOLOGIES INC

Inventor： DURON MARK WILLIAM ,  KNADLE RICHARD T JR ,  BRIDGELALL RAJ ,  CHARYCH HAL

IPC: G06K7/08 ,  H01Q5/15 ,  H01Q21/28 ,  H01Q21/30

公开(公告)号：AU2005224650A1

公开(公告)日：2005-09-29

申请号：AU2005224650

申请日：2005-03-16

Applicant: SYMBOL TECHNOLOGIES INC

Inventor： BRIDGELALL RAJ ,  STRZELCZYK MARTIN J ,  DURON MARK WILLIAM

IPC: G01S13/74 ,  G01S19/11 ,  G01S5/14 ,  G01S13/87 ,  G06K7/00 ,  G06K19/077

Abstract: A multi-resolution object location system and method for locating objects is provided. The multi-resolution system and method uses a long-range object locator together with a more precise RFID locator to efficiently and accurately determine the location of objects that include an RFID tag. The long-range object locator has a relatively longer range and can cover a relatively large area to determine the general location of the object within the large area. The RFID locator has a relatively shorter range, but is able to locate the object more precisely. The object location system uses the long-range locator to first determine the general location of the object, and then the RFID locator is used to determine a more accurate location of the object. Thus, the multi-resolution object location system is able to provide both a long range location of objects over a large area and a precise location of objects.

公开(公告)号：CA2557341C

公开(公告)日：2012-12-18

申请号：CA2557341

申请日：2005-02-25

Applicant: SYMBOL TECHNOLOGIES INC

Inventor： BRIDGELALL RAJ ,  DURON MARK WILLIAM ,  STRZELCZYK MARTIN J

IPC: G01S13/87 ,  G01S13/32 ,  G01S13/34

Abstract: A system and method is provided for locating objects using RFID tags. The system and method uses an RFID reader and a distance calculator to efficiently and accurately determine the location of objects that include an RFID tag. The RFID reader transmits a plurality of signals to the RFID tag, with the plurality of signals having different fundamental frequencies. In response, the RFID tag backscatter modulates the plurality of transmitted signals to create a plurality of backscatter-modulated signals. The RFID reader receives and demodulates the plurality of backscatter-modulated signals. The distance calculator determines the phase of the plurality of backscatter-modulated signals and determines a rate of change of the phase in the backscatter-modulated signals with respect to the rate of change in the fundamental frequency of the transmitted signals and uses this information to calculate the distance to the RFID tag.

公开(公告)号：AU2010241398A1

公开(公告)日：2010-12-02

申请号：AU2010241398

申请日：2010-11-12

Applicant: SYMBOL TECHNOLOGIES INC

Inventor： BRIDGELALL RAJ ,  DURON MARK WILLIAM ,  STRZELCZYK MARTIN J

IPC: G01S19/11 ,  G01S5/14 ,  G01S13/74 ,  G01S13/87 ,  G06K7/00 ,  G06K19/077

Abstract: A multi-resolution object location system and method for locating objects is provided. The multi-resolution system and method uses a long-range object locator together with a more precise RFID locator to efficiently and accurately determine the location of objects that include an RFID tag. The long-range object locator has a relatively longer range and can cover a relatively large area to determine the general location of the object within the large area. The RFID locator has a relatively shorter range, but is able to locate the object more precisely. The object location system uses the long-range locator to first determine the general location of the object, and then the RFID locator is used to determine a more accurate location of the object. Thus, the multi-resolution object location system is able to provide both a long range location of objects over a large area and a precise location of objects.

公开(公告)号：DE602005004605T2

公开(公告)日：2009-02-19

申请号：DE602005004605

申请日：2005-03-16

Applicant: SYMBOL TECHNOLOGIES INC

Inventor： BRIDGELALL RAJ ,  DURON MARK WILLIAM ,  STRZELCZYK MARTIN J

IPC: G01S19/11 ,  G01S5/14 ,  G01S13/74 ,  G01S13/87 ,  G06K7/00 ,  G06K19/077

Abstract: A multi-resolution object location system and method for locating objects is provided. The multi-resolution system and method uses a long-range object locator together with a more precise RFID locator to efficiently and accurately determine the location of objects that include an RFID tag. The long-range object locator has a relatively longer range and can cover a relatively large area to determine the general location of the object within the large area. The RFID locator has a relatively shorter range, but is able to locate the object more precisely. The object location system uses the long-range locator to first determine the general location of the object, and then the RFID locator is used to determine a more accurate location of the object. Thus, the multi-resolution object location system is able to provide both a long range location of objects over a large area and a precise location of objects.