Classifications

• • G—PHYSICS
  • G08—SIGNALLING
  • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
  • G08B13/00—Burglar, theft or intruder alarms
  • G08B13/22—Electrical actuation
  • G08B13/24—Electrical actuation by interference with electromagnetic field distribution
  • G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
  • G08B13/2405—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used
  • G08B13/2414—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used using inductive tags
  • G08B13/2417—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used using inductive tags having a radio frequency identification chip
• • G—PHYSICS
  • G08—SIGNALLING
  • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
  • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
  • G08B21/02—Alarms for ensuring the safety of persons
  • G08B21/0202—Child monitoring systems using a transmitter-receiver system carried by the parent and the child
  • G08B21/0275—Electronic Article Surveillance [EAS] tag technology used for parent or child unit, e.g. same transmission technology, magnetic tag, RF tag, RFID
• • G—PHYSICS
  • G08—SIGNALLING
  • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
  • G08B13/00—Burglar, theft or intruder alarms
  • G08B13/02—Mechanical actuation
  • G08B13/14—Mechanical actuation by lifting or attempted removal of hand-portable articles

Definitions

• the present invention relates to a method for monitoring objects, in particular a method for monitoring at least one object associated with a receiver device.
• the invention applies in particular to verifying that a set of objects associated with a device remain close to the device.
• the invention can be used for many applications, for example to verify that objects remain with its owner, thus being able to detect a forgotten or stolen object.
• Another example of use is monitoring a set of objects that need to stay inside a room.
• people, for example children can be monitored, in order to detect a possible remoteness.
• RFID technology for “Radio Frequency Identification”.
• An example of a known surveillance system consists in placing RFID labels or tags on objects in order to be able to check whether they are close to a user. The user is provided with an RFID reader, this RFID reader being permanently activated in order to be able to read the RFID tags and check that all the monitored objects are close to the user. When an RFID tag to be attached to the user, or in other words close to the user, is not read by the RFID reader, the user is alerted.
• This type of surveillance system is useful when a user takes inventory of objects that must be near him. This type of system, although effective, is costly for the user. Indeed, the RFID reader is expensive equipment and dedicated to this use.
• Another surveillance system intended to monitor the attachment of a set of objects to a user uses mobile devices, such as smartphones, configured to communicate according to the Bluetooth low energy communication standard ("Bluetooth Low Energy” or BLE in Anglo-Saxon terminology).
• BLE transmitters are placed on objects that must remain attached to the user or near the user. These transmitters must be permanently activated so that the user's smartphone can receive signals from the transmitters.
• the smartphone performs an inventory of nearby objects periodically and when it detects that an object has moved away, or detached, from the user, it notifies the user.
• BLE transmitters are relatively expensive equipment because they are configured to transmit actively.
• a permanently transmitting BLE transmitter consumes energy continuously.
• a system using this type of technology is expensive.
• the invention aims to improve the situation and proposes an effective object monitoring method while reducing energy consumption.
• the invention relates, according to a first aspect, to a method for monitoring at least one object associated with a receiver device.
• the method is implemented by said receiver device and comprises:
• the receiving device it is checked whether the label backscattering ambient signals associated with the object is detected by the receiving device. If the tag is detected, the object is located nearby and is considered attached to the receiving device. If the tag is not detected by the receiving device, the object is not nearby, or in other words, it is detached from the receiving device.
• an alert message can be generated, for example to warn the user of the receiving device of the absence of the nearby object.
• backscatter tags makes it possible to verify whether the object is near the receiving device, or in the same geographical area as the receiving device, without additional power consumption and without having to use a dedicated receiving device for monitoring of the object.
• an alert message is generated if said at least one object is identified as being detached from the receiver device.
• a user is notified when the object associated with the receiving device is identified as being detached.
• the user is thus warned of the distance of the object from the receiver device, or in other words, he is warned of the absence of the object near the receiver device.
• an alert message is generated if said at least one object is identified as being detached from the receiver device for a predefined period of time.
• the alert message is generated when the object is detached or away from the receiving device for a period of time.
• the message alert is not generated. Thanks to this feature, the untimely generation of alert messages is avoided. For example, a user of the receiver device moving away momentarily from an object associated with his receiver device would not receive an alert message.
• verification of detection includes verification of reception of a backscattered signal originating from said at least one object, the backscattered signal corresponding to an ambient signal and comprising a message comprising identification data relating to said at least one object. least one object.
• the receiving device When the object is located near the receiving device (or in the same geographical area as the receiving device), the receiving device receives a backscattered signal from the object, in particular from the backscatter tag. When the object moves away from the receiving device, the receiving device does not receive backscattered signals from the object. In other words, when the receiving device receives a signal backscattered by a backscatter tag, the object with that tag is attached to the receiving device. On the contrary, when the receiver device does not receive a signal backscattered by a backscatter tag, the object carrying this tag is detached from the receiver device. The receiver device can thus detect the detachment of an object, by the absence of reception of the signal backscattered by the backscatter tag carried by this object.
• the detection verification if during the verification of the reception of a signal, a backscattered signal is received, the detection verification also includes:
• the verification of the detection further comprises the determination of the detection or non-detection of the backscatter label according to the value of the determined bit error rate, the backscatter tag being determined to be detected if the magnitude of the bit error rate is greater than or equal to a predefined bit error rate, and to be undetected if the magnitude of the bit error rate is less than the rate predefined bit error code.
• the object is identified as being attached or detached to the receiving device, is a function of the magnitude of the bit error rate, the object being identified as being attached if the magnitude of the bit error rate is greater than or equal to a predefined bit error rate, and the object being identified as detached if the magnitude of the bit error rate is less than the predefined bit error rate.
• the verification of the detection further comprises the determination of the detection or non-detection of the backscatter label according to the value of the determined bit error rate, the backscatter label being determined to be detected if the magnitude of the bit error rate is greater than or equal to a predefined bit error rate for a first predefined detection time period, and to be undetected if the magnitude of the bit error rate is lower than the predefined bit error rate for a second predefined detection time period.
• the object is identified as being attached to the receiving device, if the magnitude of the bit error rate is greater than or equal to a predefined bit error rate during a first predefined period of time, and the object is identified as being detached from the receiver device if the magnitude of the bit error rate is less than the predefined bit error rate for a second predefined period of time.
• the bit error rate obtained must remain at a value greater than or equal to the predefined bit error rate for a period of time.
• the resulting bit error rate must remain below the predefined bit error rate for a period of time.
• the first predefined detection time period and the second predefined detection time period may be identical or different.
• the characteristics of the monitoring method presented below can be taken alone or in combination with each other.
• the present invention relates, according to a second aspect, to a receiver device having associated at least one object, the receiver device comprising:
• a verification module configured to verify the detection of a label backscattering ambient signals associated with said at least one object
• an identification module for identifying said at least one object as being attached to the receiver device, if the label backscattering ambient signals is detected, and as being detached from the receiver device, if the label backscattering ambient signals is not not detected.
• the present invention relates, according to a third aspect, to a system for monitoring at least one object comprising a tag backscattering ambient signals, the monitoring system comprising a transmitter device configured to emit ambient signals, and a receiver device in accordance with the invention and implementing the monitoring method according to the invention.
• the present invention relates, according to a fourth aspect, to a computer program capable of being implemented on a receiver device, the program comprising code instructions for the implementation of the steps of the monitoring method according to the invention, when it is executed by a processor.
• the present invention relates, according to a fifth aspect, to an information medium readable by a processor in a receiver device, on which is recorded a computer program comprising code instructions for the implementation of the steps of the monitoring method in accordance to the invention, when executed by the processor.
• the receiver device, the monitoring system, the computer program and the information medium have characteristics and advantages similar to those described above in relation to the monitoring method.
• FIG. 1 a is a diagram representing a monitoring system according to a first embodiment of the invention, in which two objects are attached to a receiver device,
• FIG. 1 b is a diagram representing a monitoring system according to the first embodiment of the invention, in which an object is detached from a receiver device,
• FIG. 2a is a diagram representing a monitoring system according to a second embodiment of the invention, in which two objects are attached to a receiver device,
• FIG. 2b is a diagram representing a monitoring system according to the second embodiment of the invention, in which an object is detached from a receiver device,
• FIG. 3 illustrates the steps of a monitoring method in accordance with one embodiment of the invention in the form of an exchange between the entities of Figures 1a and 1b;
• FIG. 4 illustrates steps of a monitoring method according to one embodiment of the invention in the form of an exchange between the entities of Figures 2a and 2b;
• FIG. 5a illustrates a hardware architecture that can implement the monitoring method according to the invention.
• FIG. 5b is a functional representation of a receiving device according to one embodiment of the invention.
• the invention applies to object monitoring systems, particularly for verifying that a set of objects associated with a device remains close to the device, and for detecting the possible removal of an object.
• object surveillance system can be used in many applications, for example to prevent the loss (due to theft or forgetting for example) of an object.
• object is generic and can include an object itself, but also a living being, such as a plant, an animal or a human being.
• the surveillance system in accordance with the invention uses ambient backscatter or backscatter of ambient signals emitted by a device transmitting radio frequency signals.
• Figure 1a shows a monitoring system 100 according to a first embodiment of the invention.
• the system comprises a transmitter device 1 E configured to transmit a radiofrequency signal, called “ambient signal”.
• the transmitter device 1 E is network equipment, such as a base station allowing communication between a terminal 2R and a mobile telephone network 10, such as 4G or 5G networks.
• the radiofrequency signal or ambient signal is a telephony signal, for example 4G or 5G.
• the base station (or transmitter device) 1E is configured to transmit signals to the terminal 2R as well as to receive signals from the terminal 2R.
• the radiofrequency signal may be different, for example a 4G or 5G mobile telephone signal, a WiFi signal, Bluetooth or other.
• the transmitter device 1 E may be different.
• it may be a residential gateway intended to connect an access network to a switching network of packets, such as internet.
• the gateway can communicate with the terminal according to wireless communication standards such as WiFi, Bluetooth or others.
• the terminal 2R can be a mobile telephone terminal of the “Smartphone” type, a tablet, a personal computer or any other communicating object.
• the 2R terminal constitutes a 2R receiver device configured to receive ambient signals.
• the terminal 2R can be mobile or fixed.
• the 2R terminal can be located in any environment, partitioned or in the open air.
• the transmitter device 1E and the receiver device 2R can take different forms. Indeed, the base station and the terminal are given by way of non-limiting example.
• the base station 1 E transmits an ambient signal which can be a communication or signaling signal.
• the transmitter device and the base station are equivalent and carry the same reference 1 E.
• the receiver device and the terminal are equivalent in this embodiment and carry the same reference. reference 1 R.
• two objects 01, 02 are present close to the receiver device. These objects 01, 02 are associated with the receiver device 2R, that is to say they must remain close to the receiver device 2R, or in other words they must remain in a geographical zone Z corresponding to a geographical zone surrounding the receiver or terminal device 2R.
• Each object 01, 02 includes a backscatter tag (tag in Anglo-Saxon terminology) T1, T2 configured to backscatter ambient signals emitted by the transmitter device 1 E (here the base station 1 E) to the receiver device 2R (here terminal 2R).
• a backscatter tag tag in Anglo-Saxon terminology
• T1 backscatter tag
• T2 configured to backscatter ambient signals emitted by the transmitter device 1 E (here the base station 1 E) to the receiver device 2R (here terminal 2R).
• the number of objects carrying backscatter tags T1 , T2 can be different.
• other terminals could be present in the geographical area Z and implement the invention.
• the geographical zone Z corresponds to a geographical zone where the terminal 2R is located, or a geographical zone around the terminal 2R in which the terminal 2R can detect the backscatter tags T1, T2.
• a backscatter tag is detected by the receiver device 2R when it receives an ambient signal backscattered by the backscatter tag, of a predefined power. That is, a backscattered ambient signal SR1,SR2 by a backscatter tag T1,T2 is considered to be received (and hence the backscatter tag T1,T2 is detected) when the power of the backscattered ambient signal SR1,SR2 at its reception at the receiver device 2R is equal to or greater than a detection threshold value. Below this detection threshold value, it is considered that the backscattered ambient signal SR1, SR2 is not received by the receiver device 2R, and that consequently the backscatter tag T1, T2 is not detected.
• the geographical zone Z around the terminal 2R corresponds to a geographical zone in which the power of the backscattered ambient signals SR1, SR2 received has a value equal to or greater than the predefined value.
• the geographical zone Z is spatially limited by this detection threshold value.
• the monitoring system 100 is configured to check if the objects 01, 02 are present in the geographical zone Z around the receiver device 2R, or if they are far from the receiver or terminal device 2R, or in other words, if they are located outside the geographical zone Z. The method for monitoring these objects will be described later with reference to FIG. 3.
• an object present in the geographical zone Z around the terminal 2R is attached to the terminal 2R and that an object which is not present in the geographical zone Z around the terminal 2R is detached from the terminal 2R.
• an object 01 , 02 detected by the terminal 2R is attached to the terminal 2R, and an object which is not detected by the terminal, is detached from the terminal 2R.
• the monitoring system 100 is configured to determine, or detect, among the objects associated with a terminal 2R, the objects which are attached and the objects which are detached.
• the transmitter device 1E and the receiver device 2R are configured to communicate with a monitoring server 3 via the communication network 10.
• This monitoring server 3 can be a processing unit centrally managing the monitoring of objects.
• FIG. 1b represents the surveillance system 100 in accordance with the first embodiment of the invention (represented in FIG. 1a) in which one of the objects 01, 02 associated with the terminal 2R (the object referenced 02) is is far from the terminal 2R, or in other words, has left the geographical zone Z around the terminal 2R (or detection zone of the terminal 2R).
• the object 02 detached from the terminal 2R is identified, for example to be able to warn the user of its detachment.
• FIG 3 illustrates steps of the monitoring method according to a first embodiment of the invention, in the form of an exchange between the entities described with reference to Figures 1a and 1b.
• the monitoring method uses downlink communications between the base station (transmitter device) 1E and the terminal (receiver device) 2R.
• the steps of the monitoring method are implemented by the receiver or terminal device 2R.
• the transmitter device or base station 1 E is configured to transmit ambient signals SA1, SA2.
• Each backscatter label or tag T1, T2 is configured to retransmit the ambient signals SA1, SA2 to the receiver or terminal device 2R.
• These retransmitted ambient signals SA1, SA2 are called backscattered signals SR1, SR2.
• FIG. 3 two ambient signals SA1, SA2 and two backscattered signals SR1, SR2 are shown.
• a first tag T1 retransmits a first ambient signal S1, that is to say backscatters a first backscattered signal SR1 and a second tag T2 retransmits a second ambient signal S2, that is to say backscatters a second backscattered signal SR2.
• These two ambient signals SA1, SA2 are for example transmitted at different times.
• the two labels T1, T2 can retransmit the same ambient signal SA1, SA2.
• the receiver device or terminal 2R is configured to receive the backscattered signals SR1, SR2 coming from backscatter tags present in the geographical area Z around the terminal 2R.
• the terminal 2R receives the first backscattered signal SR1 coming from the first object 01, in particular from the first tag T1, and does not receive the second backscattered signal SR2 coming from the second object 02 (situation represented in FIG. 1b).
• the first backscattered signal SR1 includes a message, this message including identification data Id 1 relating to the first object 01 .
• the identification datum Id1 relating to the first object 01 can be an identification datum uniquely identifying the object, or part of the object 01 .
• the identification data corresponds to a sequence of alphanumeric characters.
• the monitoring method includes the verification E1 of detection of a label T1, T2 backscattering ambient signals associated with the objects associated with the terminal 2R.
• the terminal 2R includes a list of associated objects 01, 02 to be monitored. This list of objects is for example stored in a memory of the terminal 2R. In the example described, the list of objects contains two objects 01, 02.
• the terminal 2R checks E1 if tags T1, T2 backscattering ambient signals are detected. For this, according to one embodiment, the terminal checks E11 if a backscattered signal coming from the object 01, 02 is received.
• the backscattered signal SR1, SR2 corresponds to an ambient signal SA1, SA2 and includes a message including identification data Id1, Id2 relating to said object 01, 02. If during the verification E11 of the reception of a signal, a backscattered signal SR1, SR2 is received, the message comprising the identification data relating to the object 01, 02 carrying the backscatter label is obtained E12. Next, the demodulation bit error rate of the message obtained is determined E13.
• the backscatter tag T1, T2 is detected or not detected. According to one embodiment, if the magnitude of the bit error rate is greater than or equal to a predefined bit error rate, the backscatter label is determined to be detected. If, on the contrary, the magnitude of the bit error rate is less than the predefined bit error rate, the tag is determined to be detected.
• the predefined bit error rate has a value of 10%. Of course, it could have different values. It will be noted that depending on the value of the predefined bit error rate, the geographical area Z is more or less extensive. Thus, by modifying this value of the bit error rate (correspond to a threshold value), the spatial limit of the geographical zone Z can be modified.
• parameters other than the resulting message bit error rate in the received backscatter signal may be used to determine a backscatter label as detected or undetected.
• the receive power of the backscatter signal can be determined, and based on the value the backscatter tag is considered detected or undetected.
• This detection threshold value is equivalent to the value of the predefined bit error rate.
• the object 01, 02 is identified E2 as being attached to the terminal 2R or detached from the terminal 2R .
• the identification E2 the object 01, 02 is identified as being attached to the receiving device, if the label T1, T2 backscattering ambient signals is detected (or determined E14 as being detected), and as being detached from the device receiver 2R, if the label T1, T2 backscattering ambient signals is not detected (or determined E14 as being not detected).
• the first object 01 is identified as being attached to the terminal 2R, and the second object 02 as being detached from the terminal 2R.
• the backscatter label in the step E14 for determining the detection or non-detection of the backscatter label T1, T2, the backscatter label is determined as being detected, if the magnitude of the bit error rate is greater than or equal to a predefined bit error rate for a first predefined detection time period. Similarly, the backscatter label T1, T2 is determined to be undetected, if the magnitude of the bit error rate is less than the predefined bit error rate for a second predefined detection time period.
• This embodiment avoids successive detections of a backscatter tag as being attached and detached. This can take place, for example, when an object is located at the limit of the geographical zone Z and the terminal is mobile. The same object can thus be detected as attached or detached as a function of movements of the terminal 2R.
• the method comprises the generation E3 of an alert message ALT when an object is identified as being detached from the receiver device 2R.
• an alert message ALT is generated to inform of the detachment of the second object 02 from the terminal 2R, or of the removal of the second object 02 from the terminal 2R.
• the alert message ALT is generated if the object is identified as being detached from the terminal 2R for a predefined period of time.
• the predefined period of time may have different values, for example a few seconds or a few minutes. This time period can be set and changed by the monitoring system user.
• This embodiment makes it possible to avoid the generation of an alert message before the predefined period of time has not elapsed, sometimes avoiding wrongful generation of alert messages.
• the alert message ALT is played back E4 on the terminal 2R to warn a user of the terminal 2R of the detachment of the second object 01.
• the user is warned of the forgetting of the object.
• the alert message ALT can be sent to other terminals and/or to the monitoring server 3 to be returned there.
• an information message MESS can be generated and then reconstituted on the terminal and/or sent to other terminals and/or to the monitoring server, to be returned there For example, thanks to this message, a user can be informed of the objects associated with his terminal.
• At least one of the steps of the monitoring method described below can be implemented by the monitoring server 3.
• At least one of getting the message E12, determining the bit rate E13, determining E14 the backscatter tag as detected or undetected, and identifying E2 the object as being attached or detached can be implemented in monitoring server 3.
• the result of step corresponding can be addressed to the terminal 2R, so that the following steps are implemented by the terminal 2R.
• the monitoring server 3 can itself implement the generation of the alert message or the information message as well as its restitution, and/or send it to the terminal 2R (and/or to other terminals ) for return.
• the alert message ALT or the information message MESS can be sent to the transmitter device 1 E.
• an alert message ALT is generated to warn a user of the absence of the second object 02 of the geographical zone Z.
• the terminal 2R obtains the identification data relating to the first object 01 and stores it in a list of objects listing the objects present in the geographical zone Z among the objects 01, 02 associated with the terminal 2R.
• the terminal 2R can also include a list of objects absent from the geographical zone Z among the objects 01, 02 associated with the terminal 2R.
• the terminal 2R sends E2 to the monitoring server 3, the identification data Id1 relating to the first object 01, that is to say the identification data Id1 contained in the first backscattered signal SR1.
• the monitoring server 3 can also keep a list of objects listing the objects present in the geographical zone Z and/or absent from the geographical zone.
• Figures 2a and 2b show a monitoring system 100' according to a second embodiment of the invention.
• the equipment of the monitoring system of this embodiment is similar to the equipment of the monitoring system of FIGS. 1a and 1b.
• the transmitter device 2E configured to transmit an ambient signal is a terminal 2E and the receiver device 1 R configured to detect backscattered signals is a base station 1 R.
• the monitoring system uses uplink communications between the terminal 2E and the base station 1R.
• the transmitter device 2E is a mobile telephone terminal of the “Smartphone” type, but can be a tablet, a personal computer or any other communicating object.
• the terminal can be mobile in a geographic zone Z or fixed.
• the receiver device 1 R can be another network equipment, such as a residential gateway intended to connect an access network to a packet switching network, such as the Internet.
• the gateway can communicate with the terminal according to wireless communication standards such as WiFi, Bluetooth or others.
• the transmitter device 2E and the receiver device 1R can take different forms. Indeed, the base station and the terminal are given by way of non-limiting example. These items of equipment being equivalent to those of the monitoring system of FIG. 1a, will not be described in detail here.
• the terminal 2E transmits an ambient signal which may be a communication or signaling signal, to the base station 1 R.
• Each object 01, 02 comprises a backscatter tag T1, T2 configured to backscatter the ambient signal SA1, SA2 emitted by the transmitter device 1 (here the terminal) to the receiver device 2 (here the base station).
• FIG 2b similarly to Figure 1b, shows the monitoring system 100 according to the second embodiment of the invention (shown in Figure 2a) in which one of the objects 01, 02 associated with the terminal 2R (the object referenced 02) has moved away from terminal 2R, or in other words, has left the geographical zone Z around terminal 2R (or detection zone of terminal 2R).
• the object 02 detached from the terminal 2R is identified, for example to be able to warn the user of its detachment.
• the geographical zone Z corresponds to the geographical zone where the terminal 2E is located, or in other words the zone surrounding the terminal 2E.
• the number of objects carrying backscatter tags T1, T2 may be different.
• other terminals could be present in the geographical area Z and implement the invention.
• Objects 01, 02 are similar to those described with reference to FIGS. 1a and 1b.
• FIG. 4 illustrates steps of the monitoring method according to a second embodiment of the invention, in the form of an exchange between the entities described with reference to FIGS. 2a and 2b.
• the monitoring method uses uplink communications between the terminal (transmitter device) 2E and the base station (receiver device) 1R.
• the monitoring method is implemented by the base station 1 E.
• two objects 01, 02 are associated with the sender or terminal device 2E and that the two objects 01, 02 are present in the geographical zone Z or are attached to the sender or terminal device 2E.
• two backscattered signals SR1, SR2 are received by the base station 1 R and the two respective backscatter tags T1, T2 are detected.
• the verification of the detection of a backscatter tag is implemented similarly to the embodiment described below with reference to Figure 3 and will not be described here again.
• an information message MESS can be generated and sent to the terminal 2E and to the monitoring server 3, to inform of the attachment of the objects 01, 02 to the terminal 2E or in other words, of the presence of the objects 01, 02 in geographic area Z.
• FIG. 5a schematically illustrates a hardware architecture of a receiver device that can implement the monitoring method according to the invention.
• the receiver device 2 can be a terminal (FIGS. 1a and 1b) or a base station (FIGS. 2a and 2b) or other network equipment.
• the receiver device 2R, 1 R comprises a communication bus 200 to which are connected:
• a processing unit 201 named in the figure CPU (for "Central Processing Unit") and may include one or more processors;
• a non-volatile memory 202 for example ROM (for “Read Only Memory”), EEPROM (for “Electrically Erasable Read Only Memory”) or a Flash memory;
• RAM Random Access Memory
• “Input/Output”) for example keys or buttons, a screen, a keyboard, a mouse or another pointing device such as a touch screen or a remote control enabling a user to interact with the 2R receiver device, 1 R via a graphical interface or human-machine interface; and
• - communication interfaces 205 named COM in the figure, suitable for exchanging data for example with the transmitter device, with objects 01, 02 bearing backscatter tags T1, T2 or with a monitoring server via a communication network 10.
• RAM 203 includes registers suitable for recording variables and parameters created and modified during the execution of a computer program comprising instructions for implementing the monitoring method according to the invention.
• the program instruction codes stored in non-volatile memory 202 are loaded into RAM memory 203 with a view to being executed by the processing unit CPU 201 .
• the non-volatile memory 202 is for example a rewritable memory of the EEPROM or Flash memory type which can constitute a support within the meaning of the invention, that is to say which can comprise a computer program comprising instructions for the implementation of the monitoring method according to the invention.
• the rewritable memory can include lists listing the objects associated with a terminal, or in other words the objects that must be present in a geographical zone Z around the terminal, and/or lists of identification data of the objects associated with the terminal, can be used for the implementation of the invention. Multiple lists of credentials can be saved.
• a list may be a list of identification data relating to objects associated with the terminal and whose presence in the geographical area is desired, a list of identification data relating to objects absent from the area geographical area or list of objects detached from the terminal, or a list of identification data relating to objects present in the geographical area or list of objects attached to the terminal.
• FIG. 5b is a functional representation of a 2R,1R receiver device according to one embodiment.
• These modules include:
• a verification module 40 configured to verify the detection of a label backscattering ambient signals associated with said object
• an identification module 50 to identify the object as being attached to the receiver device, if said label backscattering ambient signals is detected, and as being detached from the receiver, if said label backscattering ambient signals is not detected.
• the detection verification module 40 comprises:
• a verification module 41 configured to verify a reception E11 of a backscattered signal SR1, SR2 coming from the object, the backscattered signal corresponding to an ambient signal and comprising a message comprising identification data relating to said object,
• module for obtaining 42 configured to obtain E12 the message comprising the identification data relating to said object
• a determination module 43 configured to determine E13 the bit error rate of demodulation of said message obtained
• a determination module 44a configured to determine E14 the detection or non-detection of said backscatter tag as a function of the value of the determined bit error rate, said backscatter tag being determined E14 as being detected if the magnitude of the bit error rate is greater than or equal to a predefined bit error rate, and as undetected if the magnitude of the bit error rate is less than the predefined bit error rate, and/or
• a determination module 44b configured to determine configured to determine the detection or non-detection of said backscatter label as a function of the value of the determined bit error rate, said backscatter label being determined E14 as being detected if the magnitude said bit error rate is greater than or equal to a predefined bit error rate for a first predefined detection time period, and as undetected if the magnitude of said bit error rate is less than said bit error rate preset for a second preset detection time period.
• the receiver device 2R, 1 R further comprises:
• a generation module 60a configured to generate an ALT alert message if the object is identified as being detached from said receiver device, and/or
• a generation module 60b configured to generate an ALT alert message if said object is identified as being detached from said receiver device for a predefined period of time.
• the aforementioned modules and means are controlled by the processor of the processing unit 301. They can take the form of a program executable by a processor, or a material form (or “hardware”), such as a specialized integrated circuit (known in Anglo-Saxon terminology known as ASIC for “Application-Specific Integrated Circuit”), a system on chip (known in Anglo-Saxon terminology as SoC for “System On Chip”), or an electronic component of programmable logic circuit type, such as an FPGA (Field-Programmable Gate Array) type component.
• ASIC Application-Specific Integrated Circuit
• SoC System On Chip
• FPGA Field-Programmable Gate Array
• the transmitter device 1E, 2E also comprises a communication bus to which are connected a processing unit or microprocessor, a non-volatile memory, a random access memory or RAM, and a communication interface adapted in particular to exchanging data with the receiver device.
• the detachment of an object associated with a user terminal (for example due to forgetfulness or theft), and which should be attached to the user terminal, is detected, without however, deploy expensive surveillance systems that consume large amounts of energy.
• the system according to the invention using the backscatter of ambient signals does not consume large amounts of energy.
• the surveillance system according to the invention uses equipment already present in the networks and only requires backscatter tags as additional equipment. Since these backscatter tags are not expensive, the implementation of the monitoring system in accordance with the invention does not generate significant costs.

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• 2020
  • 2020-12-16 FR FR2013346A patent/FR3117606A1/fr not_active Withdrawn
• 2021
  • 2021-11-03 EP EP21815233.8A patent/EP4264586A1/de active Pending
  • 2021-11-03 CN CN202180085478.7A patent/CN116648736A/zh active Pending
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