EP4066015A1 - Procede et dispositif de localisation par retrodiffusion ambiante - Google Patents
Procede et dispositif de localisation par retrodiffusion ambianteInfo
- Publication number
- EP4066015A1 EP4066015A1 EP20824304.8A EP20824304A EP4066015A1 EP 4066015 A1 EP4066015 A1 EP 4066015A1 EP 20824304 A EP20824304 A EP 20824304A EP 4066015 A1 EP4066015 A1 EP 4066015A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- source
- backscattering
- receiving device
- transmitting
- transmitter
- Prior art date
- Legal status (The legal status 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 status listed.)
- Pending
Links
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
- G01S5/0273—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves using multipath or indirect path propagation signals in position determination
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/74—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems
- G01S13/75—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems using transponders powered from received waves, e.g. using passive transponders, or using passive reflectors
- G01S13/751—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems using transponders powered from received waves, e.g. using passive transponders, or using passive reflectors wherein the responder or reflector radiates a coded signal
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
- G01S5/0205—Details
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
- G01S5/0205—Details
- G01S5/0226—Transmitters
Definitions
- the present invention belongs to the general field of telecommunications. It relates more particularly to a method for locating a transmitter device belonging to an ambient backscattering communication system, as well as an associated locating device.
- the invention finds a particularly advantageous application, although in no way limiting, for applications of the “Internet of Things” type (“Internet of Things” or IoT in Anglo-Saxon literature).
- the ambient signal concerned corresponds to a radio signal emitted, permanently or else recurrently, by at least one source in a given frequency band.
- a radio signal emitted, permanently or else recurrently, by at least one source in a given frequency band.
- it can be a TV signal, a mobile phone signal (3G, 4G, 5G), a Wi-Fi signal, a WiMax signal, etc.
- a transmitter device uses the ambient signal to send data to said receiver device. More particularly, the transmitting device reflects the ambient signal towards the receiving device, possibly by modulating it. The signal thus reflected is called a “backscattered signal”, and is intended to be decoded by the receiving device (i.e. the receiving device extracts from the backscattered signal information transmitted by the transmitting device, for example in the form of bits).
- This solution is based on the use of an ambient Wi-Fi signal backscattered by a transmitter device, the backscattered signal being received and decoded by a plurality of receiver devices. More particularly, said receiving devices are configured to determine the angles at which the backscattered signal reaches them respectively, as well as the corresponding arrival times. On the basis of the angles and arrival times thus determined, it is possible to locate the transmitting device by implementing a triangulation algorithm.
- Such a location solution thus takes advantage of the advantages of ambient backscattering in that the transmitter device does not need to be equipped with a dedicated Wi-Fi transmitter which consumes a lot of energy.
- the object of the present invention is to remedy all or part of the drawbacks of the prior art, in particular those set out above, by proposing a solution which makes it possible to locate a transmitter device configured to backscatter an ambient signal in a more simple, less expensive and with better precision than the solutions of the prior art.
- the invention relates to a method for locating a transmitter device belonging to an ambient backscattering communication system, said system also comprising a transmitting source according to at least one frequency of given emission and a receiving device, said system also comprising a surface capable of reflecting signals coming from the source and / or from the transmitting device to the receiving device.
- Said method comprises steps of:
- measured difference a difference between measurements of a power received by the receiving device when the transmitting device is respectively in a backscattering state and in a non-backscattering state
- the calculation function evaluating the difference in power received by the receiving device according to whether the transmitting device is in a backscatter or non-backscattering state as a function of said transmission frequency, the respective positions of the source and of the transmitter and receiver devices, as well as the influence of the surface on the signals intended to be received by the receiving device,
- final position of the transmitter device determination of a position, called “final position of the transmitter device", as a function of said at least one candidate position.
- the location method advantageously relies on said calculation function which makes it possible to evaluate, via an analytical expression that the inventors have been able to establish, said power difference when a surface such as the aforementioned surface is present in the environment of the ambient backscattering communication system.
- Said calculation function is, from a mathematical point of view, a function admitting as arguments a plurality of parameters, including several fixed parameters (position of the source, emission frequency of the source) and a variable parameter (position of the transmitting device). Access to such a calculation function is particularly remarkable since it makes it possible to evaluate very precisely variations in the power difference as a function of variations in the position of the transmitter device.
- the determination of said at least one candidate position corresponds to the resolution of an equation with only one unknown, namely therefore the position of the transmitter device, the equation in question consisting in equalizing the calculation function with the deviation measured by the transmitting device.
- the location of the transmitter device according to the invention is therefore very simple to implement since it involves acquiring power measurements and then solving an equation with one unknown on the basis of the torque thus acquired.
- the location method here makes it possible to avoid the use of a plurality of transmitting devices as well as the implementation of complex calculations (triangulation algorithm) as proposed by the solutions of the prior art. This results in substantial material savings, and therefore a lower implementation cost.
- the location method according to the invention proposes to determine a final position on the basis of said at least one candidate position.
- the inventors have observed that the invention is particularly advantageous in that it makes it possible to achieve, for each candidate position, a much better location precision than in the state of the art.
- the maximum distance separating two candidate positions is less than the best location accuracy attainable by the solutions of the state of the art cited above, regardless of the value considered for l 'difference measured between the absolute extrema of the calculation function. In other words, when several candidate positions are determined, the latter are located in a very restricted area. Ultimately, the final position inherits the excellent results obtained for each candidate position in terms of location accuracy.
- the invention is also advantageous in that the communication system comprises said surface.
- the presence of such a surface in the environment of the source and of the transmitter and receiver devices implies that more signals are likely to be routed, by reflection on said surface, to the receiver device.
- Such arrangements contribute to increasing the maximum power deviation attainable on the receiving device side in comparison with a configuration where the surface would not be present.
- communication between the transmitting device and the receiving device is facilitated since the operation of the latter is conditioned on the reception of a sufficient quantity of power.
- the advantages provided by the presence of the surface in the environment of the source and of the transmitter and receiver devices are not limited to the increase in the maximum power difference attainable on the receiver device side. Indeed, the influence of the surface on the power received by the receiving device is taken into account by the computation function, which is reflected in particular by a computational contribution in said computation function.
- This computational contribution is expressed as a function of the parameters of the ambient backscattering communication system (respective positions of the source and of the transmitter and receiver devices, emission frequency of the source), which offers the possibility, by varying at least one of these parameters, such as for example the emission frequency of the source, to discriminate more finely the candidate positions between them, in comparison with a configuration where the surface would not be present.
- the invention covers not only the case where the surface forms an element introduced manually and voluntarily into the environment of the source and the transmitter and receiver devices, but also the case where the surface is already accidentally present in this environment and purposely exploited to locate the transmitting device.
- the invention can be advantageously adapted to any type of spatial configuration.
- the location method may further include one or more of the following characteristics, taken in isolation or in any technically possible combination.
- the step of determining the candidate positions is implemented by a location device, the method further comprising a step of obtaining, by the location device, of said function Calculation.
- the step of determining the final position comprises a set of sub-steps of:
- auxiliary deviation a power deviation, called “auxiliary deviation”, said set of sub-steps being iterated as long as the auxiliary deviations obtained during one iteration differ from the measured deviation determined during said iteration, the final position being determined as a function of the position or positions respectively associated with the auxiliary deviation or deviations equal to the measured deviation determined during the last iteration of said set of sub-steps.
- step of determining the final position makes it possible to remove the ambiguity as to the fact that the transmitter device could occupy a plurality of positions corresponding to said candidate positions, advantageously using the fact that the terms intervening in the analytical expression of the calculation function, and representative of the contribution of the surface, are sensitive to a modification of the emission frequency of the source.
- the final position is determined equal to the barycenter of said candidate positions.
- two candidate positions are considered to be the same if the distance separating them is less than a given measurement precision, and, if there is a plurality of candidate positions not confused with each other , said final position is therefore determined as a function of said candidate positions not merged with one another.
- the candidate positions are determined by a dichotomy method.
- the invention relates to a computer program comprising instructions for implementing the location method according to the invention when said program is executed by a computer.
- This program can use any programming language, and be in the form of source code, object code, or intermediate code between source code and object code, such as in a partially compiled form, or in n ' any other desirable shape.
- the invention relates to an information or recording medium readable by a computer on which a computer program according to the invention is recorded.
- the information or recording medium can be any entity or device capable of storing the program.
- the medium may comprise a storage means, such as a ROM, for example a CD ROM or a microelectronic circuit ROM, or else a magnetic recording means, for example a floppy disk or a disk. hard.
- the information or recording medium can be a transmissible medium such as an electrical or optical signal, which can be routed via a cable. electrical or optical, by radio or by other means.
- the program according to the invention can in particular be downloaded from an Internet type network.
- the information or recording medium can be an integrated circuit in which the program is incorporated, the circuit being adapted to execute or to be used in the execution of the method in question.
- the invention relates to a device for locating a transmitter device belonging to an ambient backscattering communication system, said system also comprising a transmitting source according to at least one given transmission frequency and a device. receiver, said system also comprising a surface suitable for reflecting signals originating from the source and / or the transmitting device towards the receiving device, said locating device comprising:
- a first determination module configured to determine a difference, called “measured difference”, between measurements of a power received by the receiving device when the transmitting device is respectively in a backscattering state and in a non-backscattering state ,
- a second determination module configured to determine at least one position, called “candidate position”, of the transmitter device for which a calculation function is equal to said measured difference, said calculation function evaluating the difference in power received by the device receiver according to whether the transmitting device is in a backscattering or non-backscattering state depending on said transmission frequency, the respective positions of the source and the transmitter and receiver devices, as well as the influence of the surface on the signals intended to be received by the receiving device,
- a third determination module configured to determine a position, called “final position”, as a function of said at least one candidate position.
- the location device may further include one or more of the following characteristics, taken in isolation or in any technically possible combination.
- the location device further comprises an obtaining module, configured to obtain said calculation function.
- said locating device is included in the source or in the transmitting device or in the receiving device.
- the invention relates to an ambient backscattering communication system comprising a transmitting source according to at least one given transmission frequency, a transmitting device and a receiving device, said system also comprising a surface suitable for reflect signals from the source and / or from the transmitting device to the receiving device, said source or said transmitting device or said receiving device comprising a locating device according to the invention.
- the invention relates to a location system comprising a location device according to the invention, as well as a receiver device for an ambient backscattering communication system intended to include a transmitting source according to at least one given transmission frequency as well as said receiving device and a transmitting device, said system also being intended to include a surface capable of reflecting signals coming from the source and / or from the transmitting device to the receiving device.
- FIG. 1 schematically represents, in its environment, a particular embodiment of a communication system by ambient backscattering according to the invention
- FIG. 2 corresponds to another representation of the system of FIG. 1, in which the respective positions of a transmitting device, of a receiving device, of a source and of a surface belonging to said system are indicated;
- FIG. 3 schematically represents an example of the hardware architecture of a location device for the implementation of a location method according to the invention
- FIG. 4 represents, in the form of a flowchart, a particular mode of implementation of the location method, said method comprising a step of determining a final position of the D_TX transmitter device as a function of candidate positions;
- FIG. 5 schematically represents a particular embodiment of the step of determining a final position of FIG. 4.
- FIG. 1 schematically shows, in its environment, a particular embodiment of a communication system 10 by ambient backscattering according to the invention.
- the communication system 10 comprises a transmitter source SO configured to transmit, according to at least one transmission frequency F_E given included in a frequency band called "transmission band", a radio signal says "Ambient signal”.
- the emission of the ambient signal takes place, for example, permanently or alternatively on a recurring basis.
- radioelectric signal we refer here to an electromagnetic wave propagating by wireless means, the frequencies of which are included in the traditional spectrum of radio waves (a few hertz to several hundred gigahertz).
- the ambient signal is a 4G mobile telephone signal transmitted by the source SO in the transmission band [811 MHz, 821 MHz], for example according to the transmission frequency F_E equal at 816 MHz, said source SO taking the form of a relay antenna.
- the invention remains applicable to other types of radio signals, such as for example a mobile telephone signal other than 4G (for example 2G, 3G, 5G), a Wi-Fi signal, a WiMax signal, a DVB-T signal, etc.
- a mobile telephone signal other than 4G for example 2G, 3G, 5G
- Wi-Fi signal for example, a Wi-Fi signal
- WiMax signal for example, a WiMax signal
- DVB-T signal a mobile telephone signal other than 4G (for example 2G, 3G, 5G), a Wi-Fi signal, a WiMax signal, a DVB-T signal, etc.
- the ambient radio signal which may be considered within the scope of the present invention. Consequently, it should be noted that the number of antennas equipping the source SO does not constitute a limiting factor of the invention.
- the communication system 10 also comprises a transmitter device D_TX as well as a receiver device D_RX respectively configured in order to communicate with each other by ambient backscattering from the ambient signal emitted by the source SO.
- the source SO as well as the transmitter devices D_TX and receiver D_RX here occupy respective fixed positions.
- the respective positions of the source SO and of the receiver device D_RX are given. In other words, it is considered that the respective positions of the source SO and of the receiver device D_RX are known.
- the communication system 10 comprises a single transmitter device D_TX and a single receiver device D_RX. It should however be specified that the invention is also applicable to a communication system comprising a plurality of devices. transmitters and / or a plurality of transmitting devices, the developments necessary for such generalization being able to be implemented without difficulty by those skilled in the art.
- communication by ambient backscattering consists in the use of the ambient signal, by the transmitter device D_TX, to send data to said receiver device D_RX.
- the transmitter device D_TX (respectively the receiver device D_RX) is configured to perform, from the ambient signal (respectively from the backscattered signal), processing aimed at backscattering said ambient signal (respectively aimed at decoding said backscattered signal) , by implementing a backscattering method (respectively a decoding method).
- the transmitter device D_TX (respectively the receiver device D_RX) comprises for example one or more processors and storage means (magnetic hard disk, electronic memory, optical disk, etc.) in which data is stored. and a computer program, in the form of a set of program code instructions to be executed to implement the backscattering method (respectively the decoding method).
- the transmitter device D_TX (respectively the receiver device D_RX) also comprises one or more programmable logic circuits, of the FPGA, PLD, etc. type, and / or specialized integrated circuits (ASIC), and / or a set of discrete electronic components, etc. adapted to implement the backscattering method (respectively the decoding method).
- the receiver device D_RX also comprises one or more programmable logic circuits, of the FPGA, PLD, etc. type, and / or specialized integrated circuits (ASIC), and / or a set of discrete electronic components, etc. adapted to implement the backscattering method (respectively the decoding method).
- ASIC specialized integrated circuits
- the transmitter device D_TX (respectively the receiver device D_RX) comprises a set of means configured in software (specific computer program) and / or hardware (FPGA, PLD, ASIC, etc.) to implement the backscattering method (respectively the decoding method).
- the D_TX transmitter device is equipped with an antenna (not shown in the figures) configured, in a manner known per se, to receive the ambient signal but also backscatter it to the receiver device D_RX. It should be noted that no limitation is attached to the number of antennas that can equip the D_TX transmitter device.
- the transmitter device D_TX is associated with a frequency band, called "influence band”, which corresponds to the frequency band in which the antenna is suitable. to receive / backscatter signals.
- influence band a frequency band included in the emission band associated with the source SO.
- working band reference is made here to the fact that the transmitter device D_TX is compatible with the source SO, namely that the backscatter can be carried out for any frequency included in said working band.
- the D_TX transmitter device is also associated with operating states, namely at least one so-called “backscatter” state (the D_TX transmitter device backscaters the ambient signal) as well as an opposite state called “non-backscattering” (the D_TX transmitter device does not backscatter the ambient signal, or, in other words, is “transparent” to the ambient signal).
- backscatter the D_TX transmitter device backscaters the ambient signal
- non-backscattering the D_TX transmitter device does not backscatter the ambient signal, or, in other words, is “transparent” to the ambient signal.
- These states correspond to configurations in which said antenna is connected to distinct impedances. This is typically a positive impedance, or even zero, for a backscattering state, and conversely a theoretically infinite impedance for the non-backscattering state.
- the transmitter device D_TX is associated with a single backscattering state as well as a single non-backscattering state.
- the invention nevertheless remains applicable in the case where the transmitter device D_TX is associated with a plurality of backscattering states, these states being distinct from each other in that they are implemented thanks to respective impedances distinct from each other (l the non-backscattering state remains unique).
- the developments which follow can be generalized without difficulty by a person skilled in the art in the case where a plurality of backscattering states is considered.
- the D_RX receiver device is equipped with a reception antenna (not shown in the figures) configured to receive signals in said working band.
- said receiver device D_RX is a cell phone of the smartphone type.
- the source SO is a cellular telephone, for example of the smartphone type
- the receiver device D_RX is a base station
- the source SO and the receiver device D_RX are both cellular telephones, for example of the smartphone type,
- the source SO is a domestic gateway (also called an “Internet box”) emitting a Wi-Fi signal
- the receiving device D_RX is a cellular telephone, for example of the smartphone type, etc .;
- the ambient backscattering communication system 10 also comprises a surface 11 capable of reflecting signals originating from the source SO and / or from the transmitter device D_TX to the receiver device D_RX.
- a surface 11 has at least one face (i.e. the face towards which the incident signal waves are directed), the roughness of which is for example adapted so as to allow such reflection.
- said surface 11 has a face whose roughness is defined by asperities distributed periodically in a direction in which the surface extends 11.
- said asperities are identical to each other and take the form of circular half cylinders whose respective axes are mutually parallel.
- Chapter 2.3 of the document “Recommendation ITU-R P.2040-1 (07/2015): Effects of building materials and structures on radiowave propagation above about 100 MHz-P Series-Radiowave ”.
- a surface 11 thus produced makes it possible to reflect an incident signal directed towards said asperities without a preferred direction. In other words, such an incident signal is reflected, in the part of the environment positioned on the side of the asperities, in an omnidirectional manner.
- said surface 11 is positioned fixed, normally in the plane in which FIG. 1 is shown, to reflect signals coming from the source SO and from the transmitter device D_TX to the receiver device D_RX.
- Such a configuration of the surface 11 therefore implies, in particular, that the source SO and the transmitter D_TX and receiver devices D_RX are positioned on the same side of the surface 11, more particularly opposite a face whose roughness is adapted, like this is mentioned above. It will of course be understood that for signals originating both from the source SO and from the transmitter device D_TX to be reflected to the receiver device D_RX, the size of the surface 11 must be adapted accordingly.
- the surface 11 is flat and extends between two ends, denoted A and B, and separated by a distance of 1 meter.
- the distances between the source SO and the surface 11 on the one hand, and the source SO and the transmitter device D_TX on the other hand, are equal to 1 meter.
- the distance between the source SO and the receiving device D_RX is for its part equal to 2 meters.
- the invention covers not only the case where the surface 11 forms an element introduced manually and voluntarily into the environment of the source SO and the transmitter D_TX and receiver devices D_RX, but also the case where the surface 11 is already present (fortuitously) in this environment and used on purpose for the invention. In the latter case, and as already mentioned above, no limitation is attached to the nature of the surface 11 since it is configured to allow the reflection of signals from the source SO and / or signals from the device.
- D_TX transmitter to D_RX receiver device can be a plate fixed to a wall and indicating a street name or a street number.
- the path PI refers to a wave coming from the source SO and arriving directly (i.e. without being reflected by the diffusing surface 11) to the receiving device D_RX;
- the path P2 (respectively the path P3) refers to a wave coming from the source SO and of which a reflection at the level of the end A (respectively at the level of the B end) of the surface 11 reaches the receiving device D_RX ;
- the path P4 refers to a wave coming from the source SO, then backscattered by the transmitting device D_TX and arriving directly at the receiving device D_RX;
- the path P5 refers to a wave coming from the source SO, then backscattered by the transmitter device D_TX and a reflection of which at the level of the surface 11, between the ends A and B, reaches the receiver device D_RX.
- FIG. 1 is intended to be a simplified representation of the environment in which the ambient backscatter communication system 10 is positioned. It should nevertheless be borne in mind that this environment is generally of complex configuration and may in practice include various elements (walls, trees, ground, etc.).
- the power difference E_P can be expressed in the form of a function which takes as arguments the said parameters F_E, S, T and R. Said function also translates, as is detailed below. , the influence of the surface 11 on the signals intended to be received by the receiver device D_RX. This function is called “calculation function” for the remainder of the description.
- said calculation function here admits a single variable parameter, namely the position of the transmitter device D_TX.
- E_P P_R - P_NR.
- - P_R corresponds to the power received by the receiving device D_RX when the transmitting device D_TX is in the backscattering state (with reference to FIG. 1, the waves which follow the paths PI to P5 contribute to the value of P_R),
- - P_NR corresponds to the power received by the receiving device D_RX when the transmitting device D_TX is in the non-backscattering state (with reference to FIG. 1, the waves which follow the paths PI, P2 and P3 contribute to the value of P_NR).
- Figure 2 which corresponds to another representation of the system 10 of Figure 1, in which are indicated said positions S, T, R as well as the ends A and B of surface 11.
- a straight line DI and a straight line D2 are also represented in FIG. 2, the straight line DI (respectively the straight line D2) corresponding to the line parallel to the segment [AB] and passing through the position S of the source SO (respectively passing through the T position of the D_TX transmitter device).
- S_RX S (SO, DIR) + S (SO, DIFF) + S (D_TX, DIR), expression that must be understood as being a vector relation on the field of complex numbers, and in which:
- D_TX, DIR corresponds to the backscattered signal coming directly from the transmitter device D_TX (path P4 with reference to figure 1) and has the following expression:
- this vector relationship is based on the assumption that the power of a backscattered signal S (D_TX, DIFF) reaching the receiver device D_RX after reflection on the surface 11 (path P5 with reference to FIG. 1) is negligible in comparison with the powers respectively associated with the signals S (SO, DIR), S (SO, DIFF) and S (D_TX, DIR). It is indeed understood that such a signal S (D_TX, DIFF) has undergone, throughout its journey, two reflections: a first reflection at the level of the transmitter device D_TX due to backscattering, as well as a second reflection at the level of the transmitter device D_TX. surface level 11.
- This plurality of reflection implies that the distance traveled by the signal S (D_TX, DIFF) is greater than those traveled respectively by S (SO, DIR), S (SO, DIFF) and S (D_TX, DIR), so that its amplitude is lower in comparison with the respective amplitudes of the latter. In other words, each reflection induces a weakening of the corresponding signal. It should be noted that this modeling hypothesis on which the formulation of the signal S_RX is based has been validated by digital simulations by the inventors.
- the calculation function involves three terms which add up to each other, including:
- said third term is the one which is representative of the influence (i.e. of the contribution) of the surface 11 in the evaluation of the power difference E_P. It is therefore understood, in view of the analytical expression of the calculation function, that the voluntary use of the surface 11 in the environment of the source SO and of the transmitter D_TX and receiver devices D_RX advantageously makes it possible to increase the maximum achievable power difference (due to the presence of said third term) in comparison with a configuration where the surface 11 would not be present.
- said calculation function typically corresponds to a set of code instructions.
- said code instructions are written in the MATLAB language, so that said calculation function corresponds to a MATLAB script.
- the software environment of the D_LOC localization device is therefore suitable, in a manner known per se, for the execution of such a MATLAB script.
- FIG. 3 schematically represents an example of the hardware architecture of the D_LOC location device for implementing the location method according to the invention.
- the D_LOC location device has the hardware architecture of a computer. As illustrated by FIG. 3, the D_LOC location device comprises, in particular, a processor 1, a random access memory 2, a read only memory 3, a non-volatile memory 4, communication means 5 integrating the antenna of the receiving device. D_RX as well as acquisition means 6.
- Said acquisition means 6 are configured to acquire measurements of an electromagnetic power received by said locator D_LOC, and therefore ultimately said receiver device D_RX. A measurement thus acquired therefore corresponds to a level of electromagnetic power received by the receiver device D_RX at the time of the corresponding acquisition.
- said acquisition means are configured to acquire a power measurement regardless of the state (non-backscattering or else backscattering) in which the transmitter device D_TX is located.
- said acquisition means 6 comprise an acquisition chain connected to a sensitive element configured to supply an analog electrical signal representative of the measured electromagnetic power.
- said sensitive element corresponds to the reception antenna equipping the receiver device D_RX.
- Said acquisition chain comprises for example an acquisition card configured to condition said electrical signal.
- the conditioning implemented by the acquisition card comprises for example, in a manner known per se, amplification and / or filtering and / or current-power conversion. In general, the configuration of such acquisition means is well known to those skilled in the art, and is therefore not detailed here further.
- the read only memory 3 of the D_LOC location device constitutes a recording medium according to the invention, readable by the processor 1 and on which is recorded a computer program PROG according to the invention, comprising instructions for the execution of the steps of the location method according to the invention.
- the PROG program defines functional modules of the D_LOC localization device, which are based on or control the hardware elements 2 to 6 of the D_LOC localization device mentioned above, and which include in particular:
- a first determination module MOD_l configured to determine a difference, called “measured difference”, between measurements acquired by the receiver device D_RX, including a first measurement and a second power measurement received when the transmitter device D_TX is respectively in a backscatter state and in a non-backscatter state,
- a second determination module MOD_2 configured to determine positions, called “candidate positions”, of the transmitter device D_TX for which said calculation function is equal to said measured deviation
- a third determination module MOD_3, configured to determine a position, called “final position”, as a function of said candidate positions.
- the code instructions defining the calculation function are initially stored in a memory equipping an entity other than the location device D_LOC, for example a memory equipping the device.
- transmitter D_TX or the source SO, or else an entity external to the system 10 and able to store the instructions of said calculation function (eg: database server).
- the location device D_LOC also comprises an obtaining module MOD_OBT configured to obtain said calculation function.
- the obtaining of the code instructions of the calculation function, by the location device D_LOC is carried out via a data exchange (transmission / reception) commanded by the obtaining module MOD_OBT and implemented by the means of communication 5 of said locating device D_LOC and means of communication of said entity.
- the communication means considered for such an exchange of data are based on a communication interface.
- this communication interface can be wired or wireless, and can put using any protocol known to those skilled in the art (Ethernet, Wifi, Bluetooth, 3G, 4G, 5G, etc.).
- FIG. 4 represents, in the form of a flowchart, a particular mode of implementation, by the location device D_LOC, of the location method.
- the location method comprises a step E10 of obtaining said calculation function.
- This step E10 is implemented by said obtaining module MOD_OBT equipping the location device D_LOC.
- the location device D_LOC has the calculation function making it possible to evaluate the difference E_P as a function of the parameters defining the communication system 10 by ambient backscattering, namely more precisely here as a function of the position T (considered as a variable) of the transmitter device D_TX as well as the parameters S, R and F_E set.
- the localization device D_LOC is therefore able to calculate values of said difference E_P by assigning values to the parameter T.
- the location method also includes a step E20 of acquiring a pair C_MES of measurements (i.e. a first measurement and a second measurement) of received power.
- This step E20 is implemented by the acquisition means 6 equipping the location device D_LOC.
- said first measurement (respectively said second measurement) is acquired when the transmitter device D_TX is in the backscattering state (respectively in the non-backscattering state). It is also obvious that the acquisitions are made in said working band, since it is in this frequency band that the transmitter D_TX and receiver devices D_RX are compatible with the source SO, as was mentioned above.
- the transmitter device D_TX is associated with given time periods that are distinct from one another, as well as configured to backscatter during said time periods.
- the locating device D_LOC for its part, has knowledge of said time periods, and is configured to synchronize with at least one of these periods, so as to be able to carry out the first measurement (respectively the second measurement) when the transmitting device D_TX backscatter (respectively does not backscatter) the ambient signal from the SO source.
- the D_LOC location device acquires knowledge of said backscattering time periods.
- said time periods are communicated by the transmitter device D_TX to the location device D_LOC prior to the acquisition step E20.
- the D_LOC location device performs acquisitions of power measurements on a recurring basis, for example according to a constant time step.
- the transmitter device D_TX is configured to transmit to the locating device D_LOC a message informing it of the passage from the non-backscattering state to the backscattering state. In this way, a measurement acquired after reception of such a message can be associated with said backscatter state.
- the location method comprises a step E30 of determining a difference, called “measured difference” E_MES, between the measurements of said C_MES pair.
- This step E30 is implemented by said first determination module MOD_1.
- the objective of determining such a measured deviation E_MES is to obtain a value that can be used to determine at least one position of the transmitter device D_TX. To this end, said measured deviation E_MES is determined to correspond to a value which can be taken by the calculation function.
- the measured difference E_MES corresponds to the subtraction from said second measurement to said first measurement, or even to the absolute value of the difference between said first and second measurements.
- the location method also comprises a step E40 of determining at least one position, called a "candidate position" T_i (i being an integer index greater than or equal to 1), of the transmitter device D_TX for which the calculation function is equal to said measured deviation E_MES.
- This step E40 is implemented by said second determination module MOD_2.
- step E40 consists in solving an equation, called the "general equation", in the variable T defined by an equality between said measurement difference E_MES and the value of the power difference E_P as given by l 'analytical expression of the computational function.
- This general equation in the variable T is written: the solution or solutions to this general equation corresponding to said candidate positions T_i.
- the inventors have observed, by numerical simulations, that there are one or more candidate positions T_i solutions to the general equation above as a function of the value of the measured deviation E_MES. More precisely, when the value of the measurement error E_MES is equal to or close to the absolute maximum attainable by the calculation function, it has been observed that said general equation admits a single solution.
- the candidate positions T_i are determined by a dichotomy method.
- Such a dichotomy method is conventionally implemented to iteratively test possible values of the variable T in a given range of values, thus making it possible to determine for which value of this range the measured deviation E_MES is reached.
- the choice of the dichotomy method constituting only one variant of implementation of the invention.
- the method implemented can be a Newton method, a fixed point method, a Lagrange method, a golden section method, etc.
- the location method proposes to discriminate between them the candidate positions T_i solutions of the general equation by taking into account a measurement precision. For this purpose, two candidate positions are considered to be the same if the distance separating them is less than a measurement precision with which the measurements of the C_MES pair are acquired. Proceeding in this way offers the possibility of reducing the number of candidate positions T_i which should be considered as being able to be occupied by the transmitting device D_TX.
- the location method according to the invention makes it possible to obtain a single position for the transmitter device D_TX, this single position corresponding to any one of the candidate positions considered to be coincident with one another.
- the location method comprises a step E50 of determining a position, called "final position of the transmitter device D_TX" T_FIN, as a function of said candidate positions T_p_NID not merged with one another.
- This step E50 is implemented by said third determination module MOD_3.
- the objective sought by such a step E50 is therefore to remove the ambiguity as to the fact that the transmitter device D_TX could occupy a plurality of positions corresponding to said candidate positions T_p_NID not merged with one another.
- step E40 if at the end of step E40, only one candidate position is obtained, this step is considered to be implicit, the single candidate position then being determined as the final position of the transmitter device D_TX. Similar considerations apply to the third determination module MOD_3 which can be confused with the second determination module MOD_2.
- FIG. 5 schematically represents a particular mode of implementation of step E50 in which a set of sub-steps are implemented to determine said final position T_FIN.
- said set of sub-steps firstly comprises a sub-step E50 1 for modifying the transmission frequency F_E of the source SO.
- the location device D_LOC is for example configured to transmit to the source SO a message informing it of the modification of the transmission frequency F_E, so that said source SO then transmits at a frequency d 'corresponding F_E_NEW modified issue.
- No limitation is attached to the form taken by this message, this form being for example in conformity with a given telecommunications standard.
- the modified transmission frequency F_E_NEW resulting from said modification is of course chosen by the locating device D_LOC in the working band since, as mentioned previously, the ambient backscattering communication system 10 is configured to operate in said band. of work.
- the modified transmission frequency F_E_NEW is equal to half of the transmission frequency F_E used by the system 10 before said modification sub-step E50_l. It should however be noted that any other value of the working band can be chosen for said modified transmission frequency F_E_NEW, the choice of this value constituting only an implementation variant of the particular mode of FIG. 5.
- step E50 comprises a sub-step E50 2 for acquiring another pair C_MES_NEW of power measurements received when the transmitter device D_TX is respectively in the state of backscatter and in the non-backscatter state.
- the implementation of this sub-step 50_2 is similar to that of step E20 described previously.
- step E50 comprises a sub-step E50 3 of determining a measured difference E_MES_NEW between the measurements of said other pair C_MES_NEW.
- the implementation of this sub-step 50_3 is similar to that of step E30 described previously.
- step E50 comprises, for each of the candidate positions T_p_NID not merged with one another, an evaluation sub-step E50 4, for said modified transmission frequency F_E_NEW, of the calculation function so as to obtain a power difference, called “auxiliary difference” E_p_AUX.
- the calculation function is evaluated by considering that the transmitter device D_TX occupies a fixed position given by T_p_NID (the positions S, R respectively of the source SO and of the receiver device D_RX being quantified. to them invariant whatever the index p considered) and that the source transmits according to the modified transmission frequency F_E_NEW. In this way, an auxiliary deviation E_p_AUX associated with it is obtained for each of said candidate positions T_p_NID which are not merged with one another.
- said set of substeps E50_l, E50_2, E50_3, E50_4 is iterated as long as the auxiliary deviations E_p_AUX obtained during an iteration differ from the measured deviation E_MES_NEW determined during said iteration.
- the value of the frequency F_E_NEW (respectively of the pair C_MES_NEW) obtained during an iteration obviously differs from the corresponding value or values obtained prior to this iteration.
- the final position T_FIN is determined as a function of the position or positions T_p_NID respectively associated with the auxiliary deviation or deviations E_p_AUX equal to the measured deviation E_MES_NEW determined during the last iteration of said set of sub-steps E50_l, E50_2, E50_3, E50_4-
- the final position T_FIN is determined other than by a barycenter calculation.
- said final position T_FIN is determined equal to a weighted combination of the candidate positions T_p_NID respectively associated with said auxiliary deviations E_p_AUX, the weighting coefficients involved being able for example to be chosen randomly, or else in a deterministic manner on the basis one or more external information (information as to the probability that the transmitter device D_TX is positioned in a determined geographical sector, etc.).
- the final position T_FIN is determined equal to any one of the candidate positions T_p_NID respectively associated with said auxiliary deviations E_p_AUX, the choice of a position among said candidate positions T_p_NID being effected by means of ' a random draw.
- the fact that the calculation function includes terms depending on the transmission frequency of the source SO, including in particular said third term representative of the contribution of the surface 11, makes it possible to obtain, following a modification of said transmission frequency, a variation in the power difference greater than if the surface 11 were absent. This helps to differentiate the values of the auxiliary deviations E_p_AUX from each other, which ultimately makes it possible to facilitate the discrimination of the candidate positions T_p_NID not confused with one another to determine the final position T_FIN.
- step E50 Other modes of implementing step E50, as an alternative to the mode in FIG. 5, can also be envisaged.
- step E50 does anything rule out considering still other modes of implementation of step E50, according to arrangements similar to those mentioned previously in the context of FIG. 5 (weighted combination of the candidate positions T_p_NID, choice of any position among said candidate positions T_p_NID), but for which, again, said arrangements are applied directly after taking into account the measurement accuracy.
- S_RX S (SO, DIR) + S (SO, DIFF) + S (D_TX, DIR).
- this vector relation is based on the assumption that the power of a backscattered signal S (D_TX, DIFF) reaching the receiver device D_RX after reflection on the surface 11 is negligible in comparison with the powers respectively associated with the signals S (SO, DIR), S (SO, DIFF) and S (D_TX, DIR).
- S (D_TX, DIFF) is taken into account in the expression of the signal S_RX.
- the inventors have been able to establish that the signal S (D_TX, DIFF) has the expression:
- WHERE K STR (G s x (G T ) 2 x G R xl 4 ) / 64p 2 .
- the invention of course remains applicable in the case where said code instructions are implemented in the D_LOC location device from its design, therefore making optional the fact that the D_LOC location device comprises an obtaining module and that the location method comprises a step E10 of obtaining.
- the code instructions of the calculation function are implemented in the read only memory 3 of the location device D_LOC so as to be integrated into the program PROG.
- the program PROG therefore comprising instructions allowing access to the control function. calculation.
- the invention also remains applicable when the steps E10 for obtaining the calculation function, E30 for determining a measured deviation E_MES, E40 for determining candidate positions and E50 for determining a final position T_FIN (with the exception of the acquisition sub-step E50_2 if the step E50 is implemented in accordance with the mode of FIG. 5) are implemented by a location device not included in the receiver device D_RX.
- the receiver device D_RX is configured to transmit to said locating device the pair C_MES of acquired measurements (and possibly the pair or pairs C_MES_NEW if applicable) so that the latter can carry out the aforementioned steps.
- the location device D_LOC is included in the source SO or else in the transmitter device D_TX.
- said D_LOC location device corresponds to a device external to the system 10 for communication by ambient backscattering.
- this external device may be a PC type computer equipped with means for receiving the C_MES pair (and possibly one or more C_MES_NEW pairs, if applicable).
- step E50 is implemented in accordance with the mode of FIG. 5
- the invention is also applicable in the case where the ambient backscattering communication system comprises a plurality of sources which are not mutually consistent.
- the fact that the sources are not coherent with one another implies in particular that the power differences induced by each source at the level of the receiver device D_RX are added together.
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FR1913556A FR3103904A1 (fr) | 2019-11-29 | 2019-11-29 | Procédé et dispositif de localisation par rétrodiffusion ambiante |
PCT/FR2020/052181 WO2021105618A1 (fr) | 2019-11-29 | 2020-11-26 | Procede et dispositif de localisation par retrodiffusion ambiante |
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