WO2009069998A1 - System and method of object positioning - Google Patents

System and method of object positioning Download PDF

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Publication number
WO2009069998A1
WO2009069998A1 PCT/MY2008/000169 MY2008000169W WO2009069998A1 WO 2009069998 A1 WO2009069998 A1 WO 2009069998A1 MY 2008000169 W MY2008000169 W MY 2008000169W WO 2009069998 A1 WO2009069998 A1 WO 2009069998A1
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WO
WIPO (PCT)
Prior art keywords
rfid
tag
control server
detected
detection system
Prior art date
Application number
PCT/MY2008/000169
Other languages
French (fr)
Inventor
Siu Jing Then
Hock Woon Hon
Ching Hau Chan
Wooi Hen Yap
Sheau Wei Chau
Lye Pin Chu
Original Assignee
Mimos Berhad
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mimos Berhad filed Critical Mimos Berhad
Publication of WO2009069998A1 publication Critical patent/WO2009069998A1/en

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K17/00—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
    • G06K7/10316—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves using at least one antenna particularly designed for interrogating the wireless record carriers
    • G06K7/10336—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves using at least one antenna particularly designed for interrogating the wireless record carriers the antenna being of the near field type, inductive coil

Definitions

  • the present invention relates generally to a system and method of identifying object location and more particularly to a system and method of object positioning using coordinated RFID detectors and distance computation.
  • RFID Radio frequency identification
  • RFID systems utilizing RFID tags are known in the art and are commonly used to identify the presence or location of certain objects in a surveillance area.
  • RFID tags have been used to track goods for purpose of keeping inventory in merchant.
  • RFID systems have also been used for identifying vehicles, parcels and animals.
  • this system has been developed to facilitate tracking and monitoring of remote persons.
  • Unauthorized persons accessing prohibited area are the major concern in large building. Numbers of security guards are limited for which they are unable to monitor every layers and every corners of the building all the time. Besides, the surveillance system in the building is not efficient enough to track the location of all the authorized personnel in the building. Therefore, security systems have been designed for providing restricted access to authorized personnel. However, a drawback to such systems is that the exact location of discovered unauthorized person could not be determined without video surveillance cameras at the usage point.
  • a basic RFID system it includes two components: a RFID reader and a transponder which is commonly called an RFID tag.
  • the RFID reader transmits a radio frequency signal to the RFID tag.
  • the RFID tag In response to receiving the RF signal, the RFID tag produces an identification response signal that is transmitted back to the RFID reader by a process known as continuous wave backscatter.
  • radio direction-finding techniques can be employed to determine the location of each RFID tag as it traverses the surveillance area.
  • the substantial advantage of RFID systems is the non-contact, non-line-of-sight capability of the technology.
  • the signal can be emitted in a range from one inch to one hundred feet or more, depending to the power output and the radio frequency used.
  • RF tags can also be read at high speeds which in most cases responding in less than one hundred milliseconds.
  • the terms of RFID and RFID tag are used herein to include any emitter of RF energy that is tracked by an RF-based surveillance system.
  • a RFID location detection system within a controlled area comprises an RFID tag, at least one RFID detector which is interfaced with a control server, the RFID reader outputs a signal to the RFID tag and receives a response signal from the RFID tag, and characterized in that a plurality of RFID detectors is positioned at predetermined coordinates of the controlled area to obtain coordinates of which the object is located.
  • the RFID reader is activated by ultrasonic-temperature integrated sensing devices which detect the object presence.
  • the control server calculates the time interval which the sensing pulses are reflected from the detected object and outputs the object's location to the RFID detector.
  • the RFID detector further comprising a temperature sensor interfaced with the control server for obtaining the environmental temperature changes data.
  • the control server performs distance computation which uses the data of the time interval received from the integrated sensing devices and the data of the temperature by the temperature sensor to determine the distance between the RFID reader and RFID tag of the detected object.
  • a method of locating an object in a controlled area comprising the steps of transmitting a signal from each of a plurality of RFID readers to the object having an RFID tag receiving a response signal by each of the plurality of RFID readers attached to the RFID detectors which are positioned at a predetermined coordinates of a controlled area, and obtaining coordinates of which the object is located.
  • the method further comprises the step of receiving an activation signal at the RFID reader from the integrated sensing devices when the presence of the object is detected by the sensing devices.
  • the sensing devices determine necessary parameters for distance computation from the detected object.
  • the method further comprises the step of obtaining the environmental temperature changes by a temperature sensor, wherein the distance between the RFID reader and RFID tag of the detected object is determined.
  • Figure 1 shows an RFID location detection system arrangement in a controlled area based on predetermined locations in accordance to the present invention
  • Figure 2 depicts a diagram of a standalone RFID detector and RFID location detection system
  • Figure 3 shows a process flow chart of the RFID location detection system and method of the present invention
  • Figure 4 is a diagram of the RFID location detection system using the 2-dimensional coordinates (X, Z) approach ;
  • Figure 5 shows a 3-dimensional cubical zone lattice of the obtained coordinates of the detected object.
  • the present invention provides a system (10) and method for locating objects that uses radio frequency identification (RFID) system.
  • RFID radio frequency identification
  • a controlled area (14) e.g. building
  • a RFID tag (11) which is affixed to the object of interest (15) whose location is desired to be located and identified in the tracking controlled area (14)
  • a RFID reader (12) that communicates with the tag (11)
  • a microcontroller (17) ultrasonic-temperature integrated sensing devices (16, 20) that connect with the microcontroller
  • the RFID detector (19) is interfaced with a control server
  • the ultrasonic sensor (16) used in the present invention is a piezoelectrical ceramic type sensor which converts electrical energy into sound.
  • Objects of interests are referring to personnel or intruders. Intruders are stated herein as human without RFID tag (11) or unauthorized personnel with a tag who enters the controlled area. Object carrying unidentified tag information within database records in the control server (13) is considered as unauthorized personnel. The personnel's and authorized visitor's identity number are written into the RFID tags (11) and RFID reader (12) by human interface. Therefore, each RFID tag (11) has a unique identification code for validation purpose.
  • a plurality of RFID detectors (19) is positioned at predetermined locations as shown in figure 1.
  • the control server (13) which is in the form of a computer positioned at each level of the building (14) and it is programmable with a set of instructions.
  • the controlled area, building as described herein is a cubical building (14) consists of three dimensional axis which are X, Y and Z as shown in figure 1.
  • the RFID detector (19) used in the present invention is a wireless computer interfaced RFID detector (19) .
  • Each positioned RFID detector (19) is connected to the control server (13) which contained the information written to the RFID tags (11) .
  • RFID tag (11) is commonly categorized as active or passive.
  • the RFID tag (11) is a passive RFID tag that utilizes modulated backscatter reflection of the signals to respond to the RFID reader (12) .
  • the authorized persons in the building (14) are strictly- tracked by RFID readers (12) .
  • the object location system (10) further includes integration of ultrasonic-temperature sensing devices (16, 20) to detect the presence of intruders (15) .
  • Ultrasonic sensor (16) generates sound waves and evaluates the echo which is received back by the sensor (16) .
  • the microcontroller (17) calculates the time, t interval between sending the signal and receiving the echo to determine the presence of the intruder (15) . If an intruder (15) passes through the location which is monitored by the integrated sensing devices (16, 20) , they will generate output signal which activates the RFID reader (12) tracking mode.
  • the temperature sensor (20) used in the RFID detector (19) of the present invention is to obtain the temperature parameter as shown in figure 2.
  • the environmental temperature changes obtained by the temperature sensor (20) are taken into account for distance computation.
  • the control server (13) is used to identify time interval of sensing pulse reflected from detected object (15) and locate actual positions for encountered object (15) . It is also combined with standalone RFID detector (19) in order to develop the RFID location detection system (10) as shown in figure 2.
  • the ultrasonic-temperature sensing devices (16, 20) of the building (14) which detect (21) the presence of the person (15) will activate (22) the controllable RFID reader (12) to transmit (23) a radio frequency signal to retrieve the tracking information from the RFID tag (11) as shown in figure 3. Detected distance information is returned to the control server (13) to locate the actual position of the targeted object (15) in the building (14) . If there is a RFID tag (11) detected, the RFID reader (12) then obtains the tag's (11) information by sending the signal to the RFID tag (11) . In response to receiving the RF signal, the RFID tag (11) produces an identification response signal that is transmitted back to the RFID reader (12) . If there is no RFID tag (11) being detected (24), the control server (13) will generate system alert message (25) and the location of the object (15) will be displayed (26) as shown in figure 3.
  • the object (15) which entered the specific area of the building (14) might be tracked by few RFID readers (12) .
  • the tag's (11) identity number, time and location of the detected object (15) are then sent (28) to the control server (13) to verify (29) whether the tag (11) information matches with the data stored in the database server.
  • the system alert (25) will also be triggered.
  • the control server (13) will generate (25) visual and audio system to alert security officers and operators. If the input tag (11) information collected is identified (31), the recorded and collected information will be displayed (26) at the operator's computer.
  • the distance computation to obtain the distance between each RFID reader (12) and RFID tag (11) of the detected object (15) is then performed by the microcontroller (17) which is programmed with the distance computation algorithm as shown below:
  • n G integer
  • the ultrasonic-temperature integrated sensing devices (16, 20) have solved the limitation of the tracking system which does not track objects (15) without RFID tag (11) and prior to the distance computation from the coordinated RFID detectors (19) in controlled area, the intruder could still be located according to RFID detector's (19) occupancy map as shown in Figure 1.

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Abstract

A system and method to locate and verify the authorization of object's identity in a controlled area by utilizing standalone RFID detectors located at every specific coordinates of the controlled area which correspond to a control server that generate system alert if unauthorized visitor enters forbidden area in the controlled area. The control server of the system determines the coordinates of the actual position of which the detected object is located and computes the distance between the detected object and RFID reader for the object positioning.

Description

System and Method of Object Positioning
Field of Invention
The present invention relates generally to a system and method of identifying object location and more particularly to a system and method of object positioning using coordinated RFID detectors and distance computation.
Background of the Invention
Radio frequency identification (RFID) systems utilizing RFID tags are known in the art and are commonly used to identify the presence or location of certain objects in a surveillance area. Previously, RFID tags have been used to track goods for purpose of keeping inventory in merchant. RFID systems have also been used for identifying vehicles, parcels and animals. However, recently this system has been developed to facilitate tracking and monitoring of remote persons.
Unauthorized persons accessing prohibited area are the major concern in large building. Numbers of security guards are limited for which they are unable to monitor every layers and every corners of the building all the time. Besides, the surveillance system in the building is not efficient enough to track the location of all the authorized personnel in the building. Therefore, security systems have been designed for providing restricted access to authorized personnel. However, a drawback to such systems is that the exact location of discovered unauthorized person could not be determined without video surveillance cameras at the usage point.
In a basic RFID system, it includes two components: a RFID reader and a transponder which is commonly called an RFID tag. The RFID reader transmits a radio frequency signal to the RFID tag. In response to receiving the RF signal, the RFID tag produces an identification response signal that is transmitted back to the RFID reader by a process known as continuous wave backscatter. By placing multiple detectors throughout a surveillance area, radio direction-finding techniques can be employed to determine the location of each RFID tag as it traverses the surveillance area.
The substantial advantage of RFID systems is the non-contact, non-line-of-sight capability of the technology. The signal can be emitted in a range from one inch to one hundred feet or more, depending to the power output and the radio frequency used. RF tags can also be read at high speeds which in most cases responding in less than one hundred milliseconds. For the purposes of this disclosure, the terms of RFID and RFID tag are used herein to include any emitter of RF energy that is tracked by an RF-based surveillance system.
It is desirable to provide an improved system for locating objects without video surveillance cameras at the usage point.
It is also desirable to provide an improved method for locating objects.
It is an object of the present invention to provide a system and method for efficient object location and tracking using distance computation algorithm.
Other objects of this invention will become apparent on the reading of this entire disclosure.
Summary of the Invention
In the present invention, a RFID location detection system within a controlled area comprises an RFID tag, at least one RFID detector which is interfaced with a control server, the RFID reader outputs a signal to the RFID tag and receives a response signal from the RFID tag, and characterized in that a plurality of RFID detectors is positioned at predetermined coordinates of the controlled area to obtain coordinates of which the object is located. The RFID reader is activated by ultrasonic-temperature integrated sensing devices which detect the object presence. The control server calculates the time interval which the sensing pulses are reflected from the detected object and outputs the object's location to the RFID detector.
Preferably the RFID detector further comprising a temperature sensor interfaced with the control server for obtaining the environmental temperature changes data. The control server performs distance computation which uses the data of the time interval received from the integrated sensing devices and the data of the temperature by the temperature sensor to determine the distance between the RFID reader and RFID tag of the detected object.
A method of locating an object in a controlled area comprising the steps of transmitting a signal from each of a plurality of RFID readers to the object having an RFID tag receiving a response signal by each of the plurality of RFID readers attached to the RFID detectors which are positioned at a predetermined coordinates of a controlled area, and obtaining coordinates of which the object is located.
Preferably the method further comprises the step of receiving an activation signal at the RFID reader from the integrated sensing devices when the presence of the object is detected by the sensing devices. The sensing devices determine necessary parameters for distance computation from the detected object.
Preferably the method further comprises the step of obtaining the environmental temperature changes by a temperature sensor, wherein the distance between the RFID reader and RFID tag of the detected object is determined.
Brief Description of -the Drawings
Other objects, features, and advantages of the invention will be apparent from the following description when read with reference to the accompanying drawings. In the drawings, wherein like reference numerals denote corresponding parts throughout the several views:
Figure 1 shows an RFID location detection system arrangement in a controlled area based on predetermined locations in accordance to the present invention;
Figure 2 depicts a diagram of a standalone RFID detector and RFID location detection system;
Figure 3 shows a process flow chart of the RFID location detection system and method of the present invention; Figure 4 is a diagram of the RFID location detection system using the 2-dimensional coordinates (X, Z) approach ; and
Figure 5 shows a 3-dimensional cubical zone lattice of the obtained coordinates of the detected object.
Detailed Description of the Preferred Embodiments
In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the invention. However, it will be understood by those or ordinary skill in the art that the invention may be practiced without these specific details. In other instances, well-known methods, procedures and/or components have not been described in detail so as not to obscure the invention. Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings.
Generally, the present invention provides a system (10) and method for locating objects that uses radio frequency identification (RFID) system. Referring initially to Figure 1, shown therein is an independent RFID detector (19) positioned at a predetermined locations in a controlled area (14) (e.g. building) which comprises a RFID tag (11) which is affixed to the object of interest (15) whose location is desired to be located and identified in the tracking controlled area (14), a RFID reader (12) that communicates with the tag (11) and a microcontroller (17), ultrasonic-temperature integrated sensing devices (16, 20) that connect with the microcontroller
(17) and an antenna (18) interfaced with the RFID reader (12) . The RFID detector (19) is interfaced with a control server
(13) . The ultrasonic sensor (16) used in the present invention is a piezoelectrical ceramic type sensor which converts electrical energy into sound.
Objects of interests are referring to personnel or intruders. Intruders are stated herein as human without RFID tag (11) or unauthorized personnel with a tag who enters the controlled area. Object carrying unidentified tag information within database records in the control server (13) is considered as unauthorized personnel. The personnel's and authorized visitor's identity number are written into the RFID tags (11) and RFID reader (12) by human interface. Therefore, each RFID tag (11) has a unique identification code for validation purpose.
A plurality of RFID detectors (19) is positioned at predetermined locations as shown in figure 1.
The control server (13) which is in the form of a computer positioned at each level of the building (14) and it is programmable with a set of instructions. For illustration purposes, the controlled area, building as described herein is a cubical building (14) consists of three dimensional axis which are X, Y and Z as shown in figure 1.
The RFID detector (19) used in the present invention is a wireless computer interfaced RFID detector (19) . Each positioned RFID detector (19) is connected to the control server (13) which contained the information written to the RFID tags (11) . RFID tag (11) is commonly categorized as active or passive. In this embodiment, the RFID tag (11) is a passive RFID tag that utilizes modulated backscatter reflection of the signals to respond to the RFID reader (12) . The authorized persons in the building (14) are strictly- tracked by RFID readers (12) .
The object location system (10) further includes integration of ultrasonic-temperature sensing devices (16, 20) to detect the presence of intruders (15) . Ultrasonic sensor (16) generates sound waves and evaluates the echo which is received back by the sensor (16) . The microcontroller (17) calculates the time, t interval between sending the signal and receiving the echo to determine the presence of the intruder (15) . If an intruder (15) passes through the location which is monitored by the integrated sensing devices (16, 20) , they will generate output signal which activates the RFID reader (12) tracking mode.
The temperature sensor (20) used in the RFID detector (19) of the present invention is to obtain the temperature parameter as shown in figure 2. The environmental temperature changes obtained by the temperature sensor (20) are taken into account for distance computation.
The control server (13) is used to identify time interval of sensing pulse reflected from detected object (15) and locate actual positions for encountered object (15) . It is also combined with standalone RFID detector (19) in order to develop the RFID location detection system (10) as shown in figure 2.
If a person carrying the RFID tag (11) enters the building (14), the ultrasonic-temperature sensing devices (16, 20) of the building (14) which detect (21) the presence of the person (15) will activate (22) the controllable RFID reader (12) to transmit (23) a radio frequency signal to retrieve the tracking information from the RFID tag (11) as shown in figure 3. Detected distance information is returned to the control server (13) to locate the actual position of the targeted object (15) in the building (14) . If there is a RFID tag (11) detected, the RFID reader (12) then obtains the tag's (11) information by sending the signal to the RFID tag (11) . In response to receiving the RF signal, the RFID tag (11) produces an identification response signal that is transmitted back to the RFID reader (12) . If there is no RFID tag (11) being detected (24), the control server (13) will generate system alert message (25) and the location of the object (15) will be displayed (26) as shown in figure 3.
The object (15) which entered the specific area of the building (14) might be tracked by few RFID readers (12) . The tag's (11) identity number, time and location of the detected object (15) are then sent (28) to the control server (13) to verify (29) whether the tag (11) information matches with the data stored in the database server.
In the present RFID location detection system (10) when the connection between the RFID detector (19) module and the control server (13) is established, continuous reading of the RFID tag's (11) identity number, the detection time and the location at which the RFID reader (12) detects the object (15) position will be displayed.
However, if the input tag (11) information collected is unidentified (30) throughout the list of the data records, where the intruder (15) has no permission to enter the particular area in the building (14) , the system alert (25) will also be triggered. The control server (13) will generate (25) visual and audio system to alert security officers and operators. If the input tag (11) information collected is identified (31), the recorded and collected information will be displayed (26) at the operator's computer.
Location of the object (15) is then further determined (27) by the distance computation method.
The distance computation to obtain the distance between each RFID reader (12) and RFID tag (11) of the detected object (15) is then performed by the microcontroller (17) which is programmed with the distance computation algorithm as shown below:
R = v x t (1)
Where : v = velocity of sound wave in air which is 348.4m/s at room temperature 29°C
= 20.055 VT
T = absolute temperature in Kelvin t = time at which the ultrasonic pulse is reflected from the detected object (15) . The object (15) coordinates = (Ox,Oy,Oz) where Oy = yn (encountered object (15) is detected by RFID readers (12) at the same level of the building (14)).
Solutions of Ox and 0y could be identified through comparisons of n-th iterations in control server in the form of:
(Xn - Ox)2 + (zn - 0z)2 = rn 2 (2)
where n G integer.
For actual three dimensional coordinates (X, Y, Z) of which the object (15) encountered could be determined in two dimensional approach (X, Z) according to two detectors (19) nearby as shown in figure 5. Due to the coordinated detectors (19) arrangement structure, detector pairs are chosen particularly so that their coordinates do not share similar X and Z coordinates. Y coordinates symbolizes the known position level of the building where the object (15) is discovered. The object (15) location information and the security state of the controlled areas could be remotely viewed on the operator' s computer.
The ultrasonic-temperature integrated sensing devices (16, 20) have solved the limitation of the tracking system which does not track objects (15) without RFID tag (11) and prior to the distance computation from the coordinated RFID detectors (19) in controlled area, the intruder could still be located according to RFID detector's (19) occupancy map as shown in Figure 1.
As will be readily apparent to those skilled in the art, the present invention may easily be produced in other specific forms without departing from its essential characteristics. The present embodiments is, therefore, to be considered as merely illustrative and not restrictive, the scope of the invention being indicated by the claims rather than the foregoing description, and all changes which come within therefore intended to be embraced therein.

Claims

Claims
1. An RFID location detection system within a controlled area comprising: an RFID tag; and a plurality of RFID detectors which is positioned at predetermined locations of said controlled area, wherein each of said RFID detectors comprising: at least one RFID reader that outputs a signal to said RFID tag and receives a response signal from said RFID tag; a microcontroller interfaced with said RFID reader; integrated sensing devices comprising temperature sensor and ultrasonic sensor that connect with said microcontroller; and an antenna interfaced with RFID reader.
2. The RFID location detection system as claimed in claim 1, wherein said RFID reader is activated by the output signal of said integrated sensing devices when an object is detected.
3. The RFID location detection system as claimed in claim 1, wherein said ultrasonic sensor determines the velocity parameter at which said signal is reflected from said detected object.
4. The RFID location detection system as claimed in claim 1, wherein said temperature sensor obtains the environmental temperature changes and activates said RFID reader when said object presence is detected.
5. The RFID location detection system in claim 1, wherein said microcontroller is used to compute distance of detected object from said RFID readers based on parameters information from integrated sensing devices and time information from control server.
6. The RFID location detection system in claim 1, wherein said system interfaced with a control server.
7. The RFID location detection system as claimed in claim 6, wherein said control server is a programmable computer which operably locates detected object based on parameters information from said integrated sensing devices.
8. The RFID location detection system as claimed in claim 7, wherein said control server records the time interval for the complete pulse transmission from said ultrasonic-temperature integrated sensing devices.
9. The RFID location detection system as claimed in claim 8, wherein said control server includes a database server for storing tag' s information, said control server verifies the tag's information obtained by said RFID reader from the RFID tag of the detected object with the detection time for the encountered object and the computed location of said detected object before validating the authorization of the identified object in said controlled area.
10. A method of locating an object in a controlled area comprising the steps of: transmitting a signal from each of a plurality of RFID readers to said object having an RFID tag; receiving a response signal by each of said plurality of RFID readers which is positioned at a predetermined coordinates of said controlled area; obtaining coordinates of which said object is located using distance computation based on any two detected RFID readers.
11. The method of locating an object as claimed in claim 10, wherein said method further comprising the step of receiving an activation signal at said RFID reader from integrated sensing devices when the presence of said object is detected by them.
12. The method of locating an object as claimed in claim 11, wherein said step includes the step of determining the time interval of the pulse from said integrated sensing devices is reflected from said detected object.
13. The method of locating an object as claimed in claim 11, wherein said method further comprising the step of obtaining the environmental temperature changes by a temperature sensor, wherein the distance between the RFID reader and RFID tag of the detected object is determined.
14. The method of locating an object as claimed in claim 10, wherein said method further comprising the steps of: retrieving said RFID tag's information by said RFID reader from said detected object; sending said received tag's information to a control server; and comparing said received tag' s information with the data stored in a database server of said control server for validating said object's authority at said controlled area.
PCT/MY2008/000169 2007-11-30 2008-12-01 System and method of object positioning WO2009069998A1 (en)

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WO2016048748A1 (en) * 2014-09-22 2016-03-31 Symbol Technologies, Llc Co-located locationing technologies
US11213773B2 (en) 2017-03-06 2022-01-04 Cummins Filtration Ip, Inc. Genuine filter recognition with filter monitoring system

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