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WO2012007600A1 - Système de sol pour détecter l'occupation d'une surface à usage collectif, dalle sensible et procédé de gestion dudit sol - Google Patents

Système de sol pour détecter l'occupation d'une surface à usage collectif, dalle sensible et procédé de gestion dudit sol Download PDF

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Publication number
WO2012007600A1
WO2012007600A1 PCT/ES2010/070494 ES2010070494W WO2012007600A1 WO 2012007600 A1 WO2012007600 A1 WO 2012007600A1 ES 2010070494 W ES2010070494 W ES 2010070494W WO 2012007600 A1 WO2012007600 A1 WO 2012007600A1
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WO
WIPO (PCT)
Prior art keywords
sensor
floor system
occupancy
sensors
electrodes
Prior art date
Application number
PCT/ES2010/070494
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English (en)
Spanish (es)
Inventor
Antoni BREY RODRÍGUEZ
Jordi Romeu Robert
Original Assignee
Urbiotica S.L.
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 Urbiotica S.L. filed Critical Urbiotica S.L.
Priority to PCT/ES2010/070494 priority Critical patent/WO2012007600A1/fr
Publication of WO2012007600A1 publication Critical patent/WO2012007600A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
    • G01V3/12—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with electromagnetic waves

Definitions

  • the invention relates to the field of control and management of the level of occupation of a space for collective use.
  • the invention relates to a floor system for detecting the occupation of a collective use surface comprising a coating and a plurality of occupancy sensors provided under said coated surface, each sensor comprising: an occupancy detector, means of transmission and control means capable of receiving a first occupancy signal of said detector and transmitting said first signal through said transmission means.
  • the invention relates to a sensitive tile that has a visible face suitable for being stepped on and a hidden face opposite said face, which comprises at least one occupancy sensor provided below said face, each sensor comprising a detector of occupation, transmission means and control means suitable for receiving a first occupancy signal of said detector and transmitting said first signal through said transmission means.
  • the invention relates to a method of managing the occupancy density of the soil system according to the invention. State of the art
  • the detection of the passage of people or objects on a floor element is known in the state of the art.
  • a modular device for the passage of people comprising a piezoelectric cable whose emitted signals are processed by a control device is known.
  • the floor element is isolated from the floor on which it is mounted by means of an anti-vibration material that covers its lower face, as well as all its sides.
  • the floor element is fed by an electric line. This floor element is complicated to install and on the other hand it is not flexible to extensions of the floor covered by these floor elements.
  • the main objective of the invention is to propose a floor system that allows detecting the occupation of a collective use surface, which can be applied simply and with a reduced service, maintenance and expansion cost.
  • This purpose is achieved by means of a floor system of the type indicated at the beginning, characterized in that the floor system also comprises at least one external power source by means of electromagnetic energy, and because said sensor comprises energy collection means capable of capturing electromagnetic energy. of said external source and electrically supply said sensor.
  • each sensor is autonomous and can be mounted on any surface without any previous electrical installation, or wiring for connection to a power supply.
  • being able to dispense with an independent power supply for each sensor greatly facilitates the extension or reduction of the surface whose occupation is intended to be monitored and managed.
  • the floor can be of various types, such as a tarred surface, covered with tiles or parquet.
  • Another important advantage is that the Replacing defective sensors is quite simple since it does not require complicated splices that, if they are poorly executed, can affect the behavior of the entire system.
  • the invention encompasses a series of preferred features that are the subject of the dependent claims and whose utility will be highlighted later in the detailed description of embodiments of the invention.
  • said sensor comprises an energy accumulator from said external source that stores the energy captured by said collection means. Thanks to this, it is not essential to feed at high energy levels constantly to ensure the continuous operation of the sensor. The energy accumulates gradually in the accumulator and the sensor is fed only when it is necessary to capture the occupation of the soil and transmit the corresponding information to a data processing system. Therefore, preferably the accumulator comprises a capacitor with leakage currents less than 5 ⁇ (microamps), said sensor being intermittently fed by said accumulator each time said capacitor is charged. Intermittent power reduces overall system consumption. On the other hand, with the accumulator the system is able to operate autonomously for a certain time despite the fact that there are cuts in the remote power supply.
  • said external source is a radio frequency antenna and said electromagnetic energy capture means comprise a radio frequency wave capture antenna between 600 and 1500 MHz to obtain an efficient and omnidirectional antenna suitable for this type of application and which in addition guarantee the safety of people during your service.
  • the external source is a main current-powered loop that surrounds said plurality of sensors and the means of Electromagnetic energy collection of each sensor comprises a coil capable of receiving a current induced by the main loop.
  • said current induced by said loop has a frequency of between 100 and 300 kHz, which allows an efficient energy transmission to be achieved.
  • the current induced by the loop has a frequency of less than 125 kHz to increase the safety of use of the system.
  • control means modify the state of the sensor between a receiving mode in which said sensor accumulates said electromagnetic energy in said accumulator and an emitting mode in which said accumulator electrically feeds said sensor and said sensor emits said first occupancy signal through of said transmission means. This reduces the overall consumption of the sensor, since during the charging phase in receiver mode it is not consuming energy.
  • the occupancy detector is capacitive, which allows the presence of a human body to be detected in a simple and reliable manner, with the detected person or object behaving as a conductive element between the electrodes.
  • the occupancy detector is formed by a first and second flat laminar electrodes arranged with their flat face oriented substantially parallel to the ground and fed by an alternating current of excitation frequency of 1 to 100 MHz and preferably 10 to 40 MHz which generates an electric field between said first and second electrodes, detecting the state of occupation of the floor system as the equivalent capacity variation between the first and second electrodes of the detector.
  • the electrode arrangement achieves reliable detection regardless of the coating material.
  • the fact that thanks to the two electrodes the intensity can be greatly reduced is also an important advantage, thereby improving the safety of use of the system.
  • the occupancy detector comprises ground planes that cover said first and second electrodes and that are provided inferiorly to said first and second electrodes.
  • the material that covers the electrodes inferiorly is a conductive material and is at the same electrical potential as the ground itself.
  • a single mass plane covers said first and second electrodes, so that losses from the lower part of the sensor are further reduced.
  • said occupancy detector comprises a plane of mass provided between said first and second electrodes.
  • the first and second electrodes are arranged concentrically, thereby increasing the monitored area and therefore the sensitivity of the system.
  • the system also comprises receiving means suitable for receiving said first transmission signal from said transmission means and a second identification signal of each of said sensors and processing means connected with said receiving means suitable for determining a occupation density of said soil system a from said first and second signals.
  • the system comprises representation means associated with said processing means, capable of representing the density of land occupation.
  • the information obtained can be communicated to users affected by the occupation of the monitored land. This allows, for example, to manage queues at shows, museums or supermarkets, informing users about the estimated time to be served.
  • the system also seeks to optimize the number of sensors needed to obtain reliable information.
  • the system comprises between 2 and 8 sensors per square meter of monitored soil.
  • the invention also raises the problem of proposing a sensitive and prefabricated tile that is suitable for covering the floor system according to the invention.
  • a tile is understood as a modular element. Multiple modular elements of this type, arranged adjacent to each other serve to cover the floor system according to the invention.
  • the sensitive tile according to the invention can have various types of materials and very different shapes.
  • the sensor comprises energy collection means capable of capturing the electromagnetic energy from an external source and electrically feeding said sensor. This tile facilitates the assembly of the floor system since it is based on modular elements that, in turn, due to its geometry allow the detection sensors to be optimally distributed.
  • the tile sensor comprises an energy accumulator from said external source that stores the energy captured by said collection means.
  • the accumulator comprises a capacitor with leakage currents less than 5 ⁇ (microamps), the sensor being intermittently fed by said accumulator each time said capacitor is charged.
  • the tile is of a paramagnetic material. The near permeability to the vacuum of the paramagnetic material of the tile improves the energy transmission between the power supply and the sensor and consequently the sensitivity of the sensor once arranged under the surface of the tile.
  • the paramagnetic material is concrete which improves the durability of the coated floor.
  • said tile comprises a cavity in said hidden face and because said sensor is embedded in said cavity by means of a protective filling resin.
  • a protective filling resin protects the sensor circuit and improves its durability.
  • the senor is arranged below said tile adjacent to said hidden face, the sensor being coated with a protective resin, which facilitates the manufacture of the tile, since the sensor must only be adhered to its hidden lower face.
  • the senor also includes identification means as an RFID (Radio Frequency Idendification) device, an English acronym for a radio frequency identification device.
  • RFID Radio Frequency Idendification
  • the device allows to identify and position in a unique way each of the sensors of the system, which facilitates the determination of the distribution of objects or people on the floor system.
  • the sensor electronics were deprogrammed, for example, due to lack of power, it would be necessary to reprogram each floor element individually, while with the RFID device, this is not necessary.
  • This RFID device allows you to position the system sensors in a simple way.
  • the invention also proposes a method of managing the occupancy density of a collective use surface.
  • said occupancy density is on a floor system that comprises at least one external power source by electromagnetic energy, and a plurality of sensors comprising means for capturing energy capable of capturing the electromagnetic energy of said source. externally and electrically supplying said sensor, each of said sensors being capable of transmitting a first occupancy signal and a second identification signal and processing means of said first and second signals.
  • the method comprises the steps of capturing said first and said second signals from each of said sensors, in a first temporary instant, determining in real time a first occupation density of said floor system at said first instant, capturing said first and said second signals from each of said sensors, in a second time instant, determining in real time a second occupation density of said floor system at said second instant, comparing said first and second occupancy densities, executing a management action as a function of such comparison.
  • said occupancy density is obtained as a percentage of sensors occupied of said floor system.
  • the occupation density is obtained as an instantaneous area of occupation of said soil system.
  • the sensors of the soil system are positioned, which allows to obtain a realistic view of the distribution of occupancy on the soil system.
  • the action consists in determining the waiting time in a queue.
  • the invention also encompasses other detail features illustrated in the detailed description of an embodiment of the invention and in the accompanying figures.
  • Fig. 1 a schematic view of a first embodiment of a floor system according to the invention.
  • Fig. 2 a schematic view of a second embodiment of a floor system according to the invention.
  • Fig. 3 an embodiment of the floor system sensor circuit according to the invention.
  • Fig. 4 a schematic sectional view of a first sensor arrangement in the floor system according to the invention.
  • Fig. 5 a schematic sectional view of a second sensor arrangement in the floor system according to the invention.
  • Fig. 6 a schematic sectional view of the part of a sensor according to the invention corresponding to the occupancy detection electrodes.
  • Fig. 7 a schematic sectional view of the part of a sensor according to the invention corresponding to the occupancy detection electrodes, applying a lower mass plane.
  • Fig. 8 a schematic cut-away view of the part of a sensor according to the invention corresponding to the occupancy detection electrodes, applying a lower ground plane for each electrode.
  • Fig. 9 a schematic sectional view of the part of a sensor according to the invention corresponding to the occupancy detection electrodes, applying a mass plane between electrodes.
  • Figs. 10, 1 1 schematic views on the upper floor possible embodiments of the sensor electrodes according to the invention.
  • Fig. 12 a schematic view of the structure of a floor system for determining waiting times in a queue according to the invention.
  • Fig. 13 a schematic view of a plurality of interconnected floor systems.
  • Fig. 14 a schematic diagram of the process according to the invention. Detailed description of an embodiment of the invention
  • the floor system according to the invention is intended to detect and manage the occupation of a covered surface for collective use.
  • a collective use surface for example, a section of public road, the tail of a supermarket, a train or subway platform or access to an enclosure, such as a museum whose occupancy density is desired monitor.
  • One of the preferred objects of the invention is the management of the occupation a collective use floor occupied by a group of people, in order to use this information for purposes such as managing queues or crowds of people or others.
  • the floor system comprises a plurality of occupancy sensors 1 intended to monitor and inform the system of the surface occupation status.
  • the sensors 1 are provided under the surface coating, such as below a tile floor or integrated into the coating itself.
  • Each sensor 1 comprises an occupancy detector 2, transmission means 4 and control means 6, such as a microprocessor, which receive a first signal from the detector 2 informing about their occupancy status. This first signal, whether occupancy or not, can be transmitted to the system through the transmission means 4 which are, for example, a transmitting antenna.
  • the detector 2 is preferably a capacitive detector formed by two electrodes 40a, 40b or flat plates separated from each other and arranged with their flat face parallel to the coated surface, so that the occupancy is measured as the variation of the equivalent capacity measured between the electrodes 40a, 40b.
  • the system also comprises an external power source 14 through low power electromagnetic energy, and compatible with human use. Normally, these power ranges are determined by regulations. This energy is captured by the capture means 8 to feed the sensor 1. This offers a remarkable advantage over other prior art systems since it eliminates any type of electrical wiring between sensors 1.
  • the source 14 is a radio frequency antenna. This antenna emits low-power radio frequency waves in an ICM band ("Industrial, Scientific and Medical") reserved for non-commercial use of radio frequencies in the industrial, scientific and medical areas. Preferably, the source 14 antenna emits at a frequency between 600 and 1500 MHz.
  • an efficient and omnidirectional power antenna that feeds the sensors from about 4 m distance, it was split from a sensor 1 formed for a printed circuit of about 15x15 cm. Thus, it was observed that to achieve an efficient and omnidirectional antenna, it was appropriate to emit from the source 14 with a wavelength between 0.2m and 0.5m. Once an optimum frequency band was detected to power the ground system, a frequency of about 868 MHz was used, since this is a free frequency within the ICM band. However, other frequencies within the cited range could also be used in the application. On the other hand, the transmitting power antenna has about 2W of power, which guarantees the safety of use of the system in a public environment.
  • the sensor 1 shown in Figure 1 also comprises an accumulator 12 of the energy captured by the collection means 8 and is responsible for storing it up to achieve an appropriate supply voltage, so that the sensor 1 can inform the system of its occupancy status through the antenna of the transmission means 4.
  • the accumulator 12 is made from a low loss capacitor.
  • the pick-up means 8 of the sensor of Figure 1 is a receiving antenna. This receiving antenna is an 868 MHz tuned dipole.
  • FIG 2 an alternative embodiment of the system is seen.
  • the sensors 1 of the system which are substantially the same as those explained above, are surrounded by a power source 14 consisting of a current source 30 that feeds a main coil 32.
  • the coil 32 is arranged so that it surrounds the sensors 1.
  • the sensors 1 have the collection means 8 which in this case are a coil wound around the perimeter of the sensor.
  • the current induced by said coil 32 has a frequency between 100 and 300 kHz.
  • FIG. 3 A possible embodiment of the sensor circuit 1 according to the invention can be seen in detail in Figure 3.
  • the collection means 8 consisting of a coil L1 mounted in parallel with a capacitor C1 designed to tune the signal received from the source 14 are shown.
  • the rectifier circuit can be any of those commonly used in the state of the art, such as a diode bridge.
  • the following module corresponds to accumulator 12.
  • the accumulator 12 consists of two capacitors C2, C3 of low losses, that is to say with leakage currents less than 5 ⁇ (microamps), and which are designed to be charged up to a maximum of 4V. So far, the elements responsible for acquiring the energy from the source 14 and subsequently storing it to power the sensor 1 have been described.
  • a regulating element 34 is provided at the outlet of the accumulator 12 consisting of a transformer known to the person skilled in the art and responsible for transforming the voltage from 4 V to 2.5 V.
  • the regulator 34 feeds, on the one hand, the means of control 6, which can be a microprocessor, the antenna of the transmission means 4 and the detector 2.
  • the detector 2 receives a 2.5 V direct current which is again converted by the exciter 36 to alternating current to supply the flat electrodes 40a, 40b.
  • the measuring device 38 detects a variation in capacity between the electrodes 40a, 40b and this variation is communicated to the control means 6.
  • the sensor 1 explained has two modes of operation: a power receiver mode and a data transmitter mode.
  • the control means 6 are in charge of alternating both states in the following way: for one minute, the charge of the accumulator 12 is produced, while the rest of the circuit from this point is inactive, that is to say that sensor 1 does not send data to the system, but is limited to accumulate energy.
  • the accumulator instantly discharges the accumulated energy in 5 ms (milliseconds).
  • the exciter 36 transforms the direct current into alternating current and excites the electrodes 40a, 40b. In this period of time the measurement of capacity variation between the electrodes 40a, 40b is performed.
  • the microprocessor then processes a first occupancy signal and sends it, through the antenna, together with a second identification signal of the corresponding sensor 1.
  • the pickup coil L1 and the antenna of the transmission means 4 in a preferred form, can be the same element.
  • a sensitive tile 42a is shown to cover the floor system.
  • the tile 42a has a visible face 50 suitable for being stepped on and a hidden face and comprises an occupancy sensor 1 provided below said face 50 as described in Figures 1 to 3.
  • the sensitive tiles 42a are made of concrete.
  • the floor system be coated only with sensitive tiles 42a, but that some of the system tiles can be conventional tiles 42b.
  • the sensors 1 are preferably distributed at a rate of between 2 and 8 sensors per square meter of soil.
  • three adjacent tiles 42a, 42b are visible, of which only the central tile 42a comprises a sensor 1 below with the characteristics explained in Figures 1 to 3.
  • the sensitive tile 42a has a cavity 48 below the face 50 which allows the introduction of the sensor 1. This cavity 48 can be made in different ways, for example, directly from the mold or subsequently machined.
  • the sensor 1 is in solidarity with the concrete tile 42a by a protective filling resin 44.
  • resin 44 has two effects: first, it protects the sensor 1 against the aggressive soil environment 46, and secondly it allows to create a modular element easily mountable on the surface to be monitored.
  • the system can be realized according to the example of Figure 5.
  • the sensor 1 is not embedded in the sensitive tile 42a, but is disposed below said adjacent tile 42a and adhered to the hidden face.
  • the sensor 1 is also protected by a coating resin 44.
  • Figure 6 shows a possible embodiment of the capacitive detector 2 of the sensor 1.
  • the sensor 1 is arranged as in Figure 5 below a sensitive tile 42a covered by the resin 44.
  • the sensor 1 in the form of a 15x15 cm printed circuit board comprises the two flat laminar electrodes 40a, 40b arranged with their face of greater surface parallel to the outer face of the tile 42.
  • the senor 1 in addition to presenting the same configuration explained in Figure 6, also has a ground plane 52 that covers the entire surface of the sensor 1 below. Thanks to the ground plane 52 , the field is difficult or virtually eliminated electrical between the lower faces 56a, 56b of the electrodes 40a, 40b. As a consequence, the electric field that passes between the upper faces 54a, 54b is increased, and thus also the sensitivity of the sensor 1. Thus, when an object is interposed in the electric field between electrodes 40a, 40b, the measured equivalent capacity variation is even older and more easily detectable.
  • each electrode 40a, 40b has its own mass plane 52.
  • the mass plane 52 is between the first and second electrodes 40a, 40b.
  • FIG. 10 a top plan view of the sensor 1 is shown very schematically.
  • the sensors 1 comprise the other parts of the circuit already described, but which for simplicity have not been represented in these two figures.
  • electrodes 40a, 40b are two concentric squares, while in Figure 1 1 they are two concentric circles. Both embodiments allow to improve the detection of people close to the sensor 1 since the electric field lines between electrodes 40a, 40b are omnidirectional.
  • any of the embodiments of the described sensors 1 is capable of incorporating identification means 10 as an RFID device.
  • the advantage in this case is obtained from the fact that it is a passive element that does not consume energy during the charging phase nor does it deprogram, thereby reducing the consumption of the sensor 1, but also allows the sensors 1 to be positioned in a very simple way.
  • a schematic embodiment of a floor system according to the invention can be seen from which a procedure for managing the density of occupancy of a collective use surface can be carried out and more particularly the management of A waiting queue
  • the floor system comprises a plurality of adjacent sensitive tiles 42a covering a surface and incorporating sensors 1 as described above.
  • the floor system comprises processing means 24 provided with receiver means 18 as an antenna that receive the information of the transmission means 4, that is the first and second signals 20, 22.
  • Representation means 26, such as a screen are connected to the processing means 24 to provide information to the people waiting in the queue.
  • the representation means 26 may also be communicated with the processing means 24 by radio frequency waves or wireless data transmission systems known to the person skilled in the art.
  • the occupation of a sensor 1 is detected by the occupancy detectors 2, which in figure 12 is schematically represented by shaded tiles.
  • the control means 6 passes to each sensor 1 from receiver mode to transmitter mode, that is to say that the energy accumulated in the accumulator 12 is supplied to the rest of the circuit.
  • the control means 6 send the first and second signals 20, 22 (occupation and sensor identity) to the receiving means 18.
  • the system determines in real time a first occupancy density in of this first instant Ti through a statistical approximation. Then the sensors S1, S2, etc.
  • the processing means 24 compares the occupation densities measured in Ti and Ti + 1 and a management action is executed. As can be seen in figure 14, the process is repeated continuously, so that in the next stage the initial state corresponds to the data obtained at the time Ti + 1, while the system proceeds to a new occupation and determination acquisition Identity of each sensor S1, S2, etc. in the instant Ti + 2.
  • the instantaneous occupancy density can be obtained as a percentage of occupation of the soil system.
  • the system can directly compare graphically by comparing occupied surfaces between the first and second instants.
  • the processing means 24 transfers this information to the representation means 26 so that the people who are queuing get real-time information of the approximate wait in the queue.
  • the invention also provides that a plurality of floor systems mounted in different locations can be intercommunicated with each other through the central processing means 24.
  • each of the places equipped with access floor systems to the enclosure is provided with means of representation 26.
  • each of the places equipped with access floor systems to the enclosure is provided with means of representation 26.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Remote Sensing (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Electromagnetism (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Geophysics (AREA)
  • Geophysics And Detection Of Objects (AREA)

Abstract

L'invention concerne un système de sol pour détecter l'occupation d'une surface (46) à usage collectif qui comprend un revêtement et une pluralité de capteurs (1) d'occupation disposés sous ladite surface (46) revêtue. Chaque capteur (1) comprend un détecteur (2) d'occupation, des moyens de transmission (4) et des moyens de commande (6) pour recevoir un premier signal d'occupation dudit détecteur (2) et transmettre ledit premier signal (20) à l'aide des moyens de transmission (4). Le système de sol (16) comprend également une source extérieure (14) d'alimentation par énergie électromagnétique. Le capteur (1) comprend également des moyens de capture (8) d'énergie pour capturer l'énergie électromagnétique de la source (14) et alimenter électriquement le capteur (1). L'invention concerne également une dalle sensible, ainsi qu'un procédé de gestion de l'occupation du sol sur lequel le système est utilisé.
PCT/ES2010/070494 2010-07-16 2010-07-16 Système de sol pour détecter l'occupation d'une surface à usage collectif, dalle sensible et procédé de gestion dudit sol WO2012007600A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/ES2010/070494 WO2012007600A1 (fr) 2010-07-16 2010-07-16 Système de sol pour détecter l'occupation d'une surface à usage collectif, dalle sensible et procédé de gestion dudit sol

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/ES2010/070494 WO2012007600A1 (fr) 2010-07-16 2010-07-16 Système de sol pour détecter l'occupation d'une surface à usage collectif, dalle sensible et procédé de gestion dudit sol

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2534697A1 (fr) 1982-10-13 1984-04-20 Electronique Controle Mesure S Dispositif de detection de passage d'objets et/ou de personnes
US6750769B1 (en) * 2002-12-12 2004-06-15 Sun Microsystems, Inc. Method and apparatus for using RFID tags to determine the position of an object
US20050200453A1 (en) * 2004-01-27 2005-09-15 Turner Richard H Method and apparatus for detection and tracking of objects within a defined area
US20060273903A1 (en) * 2005-06-03 2006-12-07 Kim Young W Apparatus for identifying objects using radio frequency and apparatus and method for tracking position of object using the same

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2534697A1 (fr) 1982-10-13 1984-04-20 Electronique Controle Mesure S Dispositif de detection de passage d'objets et/ou de personnes
US6750769B1 (en) * 2002-12-12 2004-06-15 Sun Microsystems, Inc. Method and apparatus for using RFID tags to determine the position of an object
US20050200453A1 (en) * 2004-01-27 2005-09-15 Turner Richard H Method and apparatus for detection and tracking of objects within a defined area
US20060273903A1 (en) * 2005-06-03 2006-12-07 Kim Young W Apparatus for identifying objects using radio frequency and apparatus and method for tracking position of object using the same

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