Method and device for localising an electronic terminal

Abstract

The invention relates to a localisation method implemented by a localisation device, wherein the device comprises at least a first radio receiver and a second radio receiver spaced apart from one another, and wherein the method is characterised in that it comprises the following steps: - receiving, by the first receiver, at least one first localisation datum originating from a first transmitter and at least one second localisation datum originating from a second transmitter; - receiving, by the second receiver, at least one third localisation datum originating from the first transmitter and at least one fourth localisation datum originating from the second transmitter; - determining, on the basis of the first, second, third and fourth data and the position of the first and second receivers, the position of the device with respect to one of the two regions of interest defined by a plane perpendicular to the ground, wherein the plane comprises the first and second transmitters.

Description

Method and device for locating an electronic terminal.

[0001] 1. Field of the invention

[0002] The present invention relates to the field of telecommunications and more particularly concerns the location in space of a telecommunications terminal.

[0003] 2. Prior Art

[0004] Locating a telecommunications terminal indoors is a more complex challenge than locating it outdoors, as GPS (Global Positioning System) signals are often not strong or accurate enough to work effectively inside buildings. However, several technologies and methods can be used to locate a terminal indoors. These include wireless technologies such as Bluetooth® or Wi-Fi®. Specifically, when a terminal equipped with a wireless receiver detects / receives signals emitted by a wireless transmitter of the same technology, the terminal can generally deduce that it is located in a circular area (disc) which includes the wireless transmitter at its center (this assumes, of course, an unobstructed environment, i.e., without obstacles). The position of the terminal, however, remains imprecise because it is not possible to know its position within the circular area / disc.This method therefore does not allow for addressing certain specific uses requiring the terminal to detect its location / position in relation to an area of ​​interest delimited by a plane perpendicular to the ground.

[0005] To meet this need and improve the accuracy of the location, it is possible to implement the so-called "triangulation" method, which allows the terminal to precisely determine its location / position in space using distance measurements calculated between the terminal and three known reference points. This method has the disadvantages of requiring the use of three wireless transmitters (complexity and significant cost), knowledge by the terminal of the location / position of the three wireless transmitters, and knowledge by the terminal of the location / position of the line / plan delimiting the area of ​​interest.

[0006] There is therefore a need to invent a process which allows a terminal to determine its position simply and at low cost in relation to an area of ​​interest delimited by a plane perpendicular to the ground.

[0007] 3. Statement of the invention

[0008] The invention improves the state of the art and proposes for this purpose a location method implemented by a location device, said device comprising at least a first and a second radio receiver distinct from each other, said method being characterized in that it comprises the following steps:reception, by said first receiver, of at least one first location data item from a first transmitter and at least one second location data item from a second transmitter;reception, by said second receiver, of at least one third location data item from said first transmitter and at least one fourth location data item from said second transmitter;determining, as a function of said first, second, third and fourth data and a position of said first and second receivers, the position of said device in one of the two areas of interest delimited by a plane perpendicular to the ground, said plane comprising said first and second transmitters.;

[0009] Advantageously, the method allows, for example, a user's mobile terminal to locate itself indoors relative to an area of ​​interest delimited by a plane perpendicular to the ground. Concretely, the mobile terminal comprises two wireless antennas / receivers capable of receiving data from two wireless beacons / transmitters. Once the data has been obtained, the terminal determines, using the received data and the position of the antennas, the location of the terminal relative to one of the two areas delimited by a plane perpendicular to the ground which includes the two transmitters.

[0010] According to a particular embodiment of the invention, a method as described above is characterized in that the determination step comprises: a first step of calculating a direction associated with each of said first and second transmitters as a function of said first, second, third and fourth data and as a function of said position of said first and second receivers; a step of calculating the re-entrant or salient angle produced by two half-lines originating from said device and comprising respectively the first and second transmitters; a step of determining, as a function of the value of said angle, the position of said device.

[0011] Advantageously, this embodiment makes it possible to determine the position of the device / terminal via data received, from the two transmitters, by the two receivers of the device / terminal. Concretely, once the data has been obtained, the terminal determines a direction associated with each of the two wireless transmitters according to the alignment of the two antennas of the terminal. In other words, the method determines the directions to follow to reach the first and second transmitters starting from the device (i.e. two half-lines originating from the device and comprising respectively the first and second transmitters).

[0012] When the directions are established / determined, the method calculates the re-entrant and / or salient angle made by the two half-lines. Depending on the value of the angle, the method then determines the location of the terminal in relation to one of the two areas delimited by a plane perpendicular to the ground which includes the two transmitters.

[0013] According to a particular embodiment of the invention, a method as described above is characterized in that said first and third location data comprise an identifier of said first transmitter and said second and fourth location data comprise an identifier of said second transmitter.

[0014] Advantageously, this embodiment makes it possible to identify with certainty the origin (i.e. the beacon / transmitter) of the data received by the device / terminal via an identifier contained in the data transmitted by the transmitters. The identifier may be a serial number, a MAC (Media Access Control) address, or more generally a sequence of alphanumeric characters. For example, the first beacon may broadcast (include in the transmitted data) an identifier “beacon_A”. The second beacon may broadcast (include in the transmitted data) an identifier “beacon_B”.

[0015] According to a particular embodiment of the invention, a method as described above is characterized in that at least one of said first, second, third and fourth location data comprises at least one identifier associated with at least one of said two areas of interest.

[0016] Advantageously, this embodiment makes it possible to define and / or identify one of the two zones delimited by a plane perpendicular to the ground, a plane which includes the two transmitters, as the zone to be considered (i.e. the zone of interest). For example, an area in a station for which a transport ticket must be validated. This identifier may, for example, correspond to a character string comprising an angle to be considered and its sign (positive or negative).

[0017] According to a particular embodiment of the invention, a method as described above is characterized in that the step of reception by said first receiver is preceded by a step of obtaining at least one identifier associated with at least one of said two areas of interest.

[0018] Advantageously, this embodiment makes it possible to obtain (for example from a server located in the network or from a RAM / ROM of the device) an identifier of one of the two areas of interest before the device enters into communication with one of the two beacons. This identifier can for example correspond to a character string comprising an angle to be considered and its associated sign (positive or negative).

[0019] According to a particular embodiment of the invention, a method as described above is characterized in that the reception and determination steps are carried out at regular time intervals.

[0020] Advantageously, this embodiment makes it possible to check at regular time intervals (potentially in real time) whether or not the terminal / device enters the area of ​​interest.

[0021] According to a particular embodiment of the invention, a method as described above is characterized in that said first and second receivers and said first and second transmitters use UWB® wireless communication technology or 5G wireless communication technology according to the 3GPP (3rd Generation Partnership Project) specifications release 15 and later.

[0022] According to a particular embodiment of the invention, a method as described above is characterized in that the determination step is followed by a step of executing an application as a function of a service datum, said service datum being comprised of at least one of said first, second, third and fourth location datum.

[0023] Advantageously, this embodiment makes it possible, for example, to trigger a payment process when the terminal / device crosses the boundary symbolized by a plane perpendicular to the ground, a plane which includes the two transmitters. Alternatively or cumulatively, the application can deduct a token (for example a ticket) or issue a request / notification.

[0024] According to a particular embodiment of the invention, a method as described above is characterized in that the determination step is followed by a step of sending a message to a conversational agent identified by a conversational agent identifier comprised by at least one of said first, second, third and fourth location data.

[0025] Advantageously, this embodiment makes it possible to trigger a dialogue with a conversational agent, for example, when the terminal / device crosses the limit determined by a plane perpendicular to the ground, a plane which includes the two transmitters.

[0026] The invention also relates to a location device, said device comprising at least a first and a second radio receiver distinct from each other, said device being characterized in that it comprises: a first module for receiving, by said first receiver, at least one first location data item from a first transmitter and at least one second location data item from a second transmitter; a second module for receiving, by said second receiver, at least one third location data item from said first transmitter and at least one fourth location data item from said second transmitter;a module for determining, as a function of said first, second, third and fourth data and a position of said first and second receivers, the position of said device in one of the two areas of interest delimited by a plane perpendicular to the ground, said plane comprising said first and second transmitters.;

[0027] The term module can correspond to a software component as well as to a hardware component or a set of hardware and software components, a software component itself corresponding to one or more computer programs or subroutines or more generally to any element of a program capable of implementing a function or a set of functions as described for the modules concerned. In the same way, a hardware component corresponds to any element of a hardware assembly capable of implementing a function or a set of functions for the module concerned (integrated circuit, smart card, memory card, etc.).

[0028] The invention also relates to a mobile terminal characterized in that it comprises a location device as described previously.

[0029] The invention also relates to a computer program comprising instructions for implementing the above method according to any of the particular embodiments described above, when said program is executed by a processor. The method can be implemented in various ways, including in hard-wired form or in software form. 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 any other desirable form.

[0030] The invention also relates to a recording medium or information medium readable by a computer, and comprising instructions of a computer program as mentioned above. The recording media mentioned above can be any entity or device capable of storing the program. For example, the medium can comprise a storage means, such as a ROM, for example a CD ROM or a microelectronic circuit ROM, or a magnetic recording means, for example a hard disk. Furthermore, the recording media can correspond to a transmissible medium such as an electrical or optical signal, which can be conveyed via an electrical or optical cable, by radio or by other means. The programs according to the invention can in particular be downloaded from a network such as the Internet.

[0031] Alternatively, the recording media may correspond to an integrated circuit in which the program is incorporated, the circuit being adapted to carry out or to be used in carrying out the method in question.

[0032] This location device and this computer program have characteristics and advantages similar to those described previously in relation to the location method.

[0033] 4. List of figures

[0034] Other characteristics and advantages of the invention will appear more clearly on reading the following description of particular embodiments, given as simple illustrative and non-limiting examples, and the appended drawings, among which:

[0035] The represents an example of an environment and implementation of the invention according to a particular embodiment of the invention,

[0036] Illustrates the architecture of a device suitable for implementing the localization method according to a particular embodiment,

[0037] Represents the main steps of the localization process, according to a particular embodiment,

[0038] The figure represents a second example of implementation of the invention according to a particular embodiment of the invention.

[0039] 5. Description of an embodiment of the invention

[0040] Illustrates an example of an environment for implementing the invention according to a particular embodiment of the invention.

[0041] The implementation environment includes a TRM terminal. The TRM terminal corresponds to an electronic terminal (computer, television, connected object, electronic tablet, smartphone, on-board computer of a car, game console, etc.) comprising at least two wireless receivers (not shown) spaced (distinct) from each other and capable of communicating via a wireless connection (for example via Wi-Fi®, Bluetooth®, LoRa® technology, etc.). The two receivers are for example included by the line REF_TRM.

[0042] Alternatively, the terminal 101 is connected to a location device capable of implementing the location method.

[0043] According to a particular embodiment of the invention, the execution of the location method can be distributed between the TRM terminal and the location device.

[0044] The implementation environment also includes two fixed wireless beacons / transmitters (BAL_A / BAL_B) capable of communicating with the TRM terminal and more particularly with its two wireless receivers.

[0045] In the remainder of the description we will assume a user of a transport service, equipped with a smartphone (TRM), who wishes to take a T train. The user approaches the beginning of the platform in order to board. The two beacons BAL_A and BAL_B are located in such a way that the user cannot access the platform of train T without crossing a virtual line which includes the two beacons. In the example described in support of the, the boarding platform corresponds to the zone "ZONE_IN".

[0046] We will now describe an example of hardware architecture of a obtaining device according to a particular embodiment of the invention in connection with the.

[0047] La represents the hardware architecture of a location device DISP according to the invention. In the embodiment described here, this device has the hardware architecture of a computer. It comprises in particular a processor PROC1, a random access memory MV1, a read-only memory MEM1 and a non-volatile flash memory MF1. Such means are known per se and are not described in more detail here. The read-only memory constitutes a recording medium according to the invention, readable by the processor PROC1 and on which is recorded here a computer program PG1 according to the invention, this program comprising instructions for implementing the steps of the location method as described above, when the program is executed by the processor PROC1.

[0048] At initialization, the code instructions of the computer program PG1 are for example loaded into a memory before being executed by the processor PROC1. The processor PROC1 of the processing unit UT1 notably implements the steps of the location method according to any one of the particular embodiments described in relation to Figures 1 and 4, according to the instructions of the computer program PG1.

[0049] The DISP device also comprises a RECV1 module capable of receiving location data from at least a first and a second wireless beacon / transmitter. The location data may, for example, comprise an identifier of the beacon that transmitted the data(s). The data(s) may correspond to a character string and optionally be encrypted via a symmetric or asymmetric encryption key.

[0050] The DISP device further comprises a RECV2 module separate from the RECV1 module capable of receiving location data from the first and second beacons. The location data may, for example, comprise an identifier of the beacon that emitted the data(s). The data(s) may correspond to a character string and optionally be encrypted using a symmetric or asymmetric encryption key.

[0051] Note that the RECV1 and RECV2 modules are physically spaced from each other at the DISP device level.

[0052] The DISP device also includes a DETER module capable of determining the location / position of the DISP device relative to one of the two areas of interest delimited by a plane perpendicular to the ground comprising the first and second beacons. To do this, the DETER module uses the location data obtained by the RECV1 and RECV2 modules.

[0053] According to a particular embodiment of the invention, the DISP device may comprise a restitution module (not shown) for a location of the DISP device determined by the DETER module as a function of the first and second beacons. The restitution device may be a vibrating motor module (not shown) adapted to restore location information using specific vibrations, for example by generating more or less intense vibrations depending on the proximity of the DISP device to a plane perpendicular to the ground comprising the first and second beacons. The restitution device may also be an audio module (not shown), such as for example a loudspeaker, adapted to restore location information using a voice synthesis module.The restitution device may also be a display module (not shown) such as for example a screen (touch or not) adapted to display location information of the DISP device relative to a plane perpendicular to the ground comprising the first and second beacons.

[0054] Illustrates steps of the localization method according to a particular embodiment of the invention.

[0055] Here we take up the example described in support of the. The method is implemented by the TRM terminal. Alternatively, the method is implemented by a device integrated or connected to the TRM terminal.

[0056] The BAL_A and BAL_B beacons communicate with the TRM terminal and more specifically its two wireless receivers (for example antennas) via Ultrawide Band (UWB) wireless technology or equivalent in 5G or 6G mobile network technology.

[0057] Note that the system described in support of the can correspond to any wireless transmission system capable of enabling the implementation of angle measurement technology (in English AoA Angle of Arrival).

[0058] During step GET1 the TRM terminal detects the beacons BAL_A and BAL_B. The first receiver (antenna) of the TRM terminal receives at least one data item from the beacon BAL_A and at least one data item from the beacon BAL_B. Each data item may correspond to a character string which may include an identifier of the beacon which emitted the data item (for example “beacon_A” or “beacon_B”).

[0059] During step GET2 the second receiver (antenna) of the TRM terminal receives at least one piece of data from the BAL_A beacon and at least one piece of data from the BAL_B beacon. Similarly, each piece of data may correspond to a character string which may include an identifier of the beacon which emitted the data (for example “beacon_A” or “beacon_B”).

[0060] During the CALC step, the method calculates, based on the data received from the beacons (BAL_A and BAL_B) and for example based on the position of the receivers located on the TRM terminal, a direction to follow to reach the beacon BAL_A and a direction to follow to reach the beacon BAL_B from the TRM terminal (i.e. the two half-lines [TRM, BAL_A) and [TRM, BAL_B)). To do this, the method can use angle measurement technology (in English AoA Angle of Arrival). This technique is known per se and will not be described in more detail here.

[0061] Once the directions have been determined, the method calculates the salient angle made by the two half-lines [TRM, BAL_A) and [TRM, BAL_B) i.e. the angle .

[0062] To calculate this angle the method can calculate the salient angle then subtract the found value from the value of the salient angle . The angle to be considered, that is to say the salient angle can be defined by convention (data known to the location method). According to a particular embodiment of the invention, the salient angle to be considered can be determined via a tag naming convention that allows their order in the angle calculation to be defined (BAL_A precedes BAL_B).

[0063] Alternatively or cumulatively, the angle to be considered (in our case the salient angle can be included in one of the data received from the BAL_A tag and / or the BAL_B tag. According to a particular embodiment of the invention, the salient angle to be considered, can be determined via data received from the BAL_A tag and / or the BAL_B tag indicating the order in which the tags should be considered (BAL_A precedes BAL_B).

[0064] According to a particular embodiment of the invention, the BAL_A beacon and / or the BAL_B beacon and / or the location method can receive, from a server located in the network, data comprising the angle to be considered.

[0065] Note that obtaining the angle to be considered, by the BAL_A beacon and / or the BAL_B beacon and / or the location method, can be carried out before the TRM terminal detects the beacons or vice versa. For example, in the case where the location method is executed on the TRM terminal by a transport application (automatically or following a user action), the application (for example the location method) can first obtain data indicating the virtual thresholds located nearby (as a function of its location, for example as a function of its GPS coordinates), i.e. the planes perpendicular to the ground comprising beacons and the angles to be considered. Alternatively or cumulatively, the application can receive data comprising the angle to be considered, in response to a request comprising the identifiers of the beacons detected by the TRM terminal (for example the BAL_A and / or BAL_B beacons).

[0066] The REF_TRM line (virtual line) can correspond to any line included in a plane that includes the same part of the TRM terminal, regardless of the orientation in space of the TRM terminal. For example, the REF_TRM line can correspond to a line that includes the two receivers of the TRM terminal. This REF_TRM line corresponds to a reference line allowing the determination of the angle of arrival of the radio signal in the “Angle of Arrival” techniques.

[0067] In our example the salient angle is equal to -130° (the trigonometric direction being counterclockwise). The salient angle is equal to -30°. Therefore the angle is equal to -130°+30° or -100°.

[0068] The method then determines the position of the TRM terminal relative to one of the two areas of interest delimited by the plane perpendicular to the ground comprising the BAL_A and BAL_B beacons.

[0069] The angle sign being negative the process deduces that the terminal is in the “ZONE_OUT” zone.

[0070] Note that in the case described above the angle considered (i.e. the angle ) may correspond, within the meaning of the invention, to an identifier associated with one of the two zones of interest delimited by the virtual threshold symbolized by the line (BAL_A, BAL_B). Indeed, the “ZONE_OUT” can be identified by the fact that the angle is negative and the “ZONE_IN” by the fact that the angle is positive. In other words, the method can, by convention, consider that the zone "ZONE_IN" corresponds to the zone or the angle is positive and that the zone “ZONE_OUT” corresponds to the zone or angle is negative.

[0071] Alternatively, the identifier associated with one of the two areas of interest delimited by the virtual threshold symbolized by the line (BAL_A, BAL_B) can include the angle to be considered (in our case the angle ) but also its sign (positive or negative).

[0072] Let us now consider the situation in which the user of the TRM terminal crosses the virtual threshold symbolized by the line (BAL_A, BAL_B).

[0073] The salient angle is equal to 150° (the trigonometric direction being counterclockwise). The salient angle is equal to 25°. Therefore the angle is equal to 150°-25° or 125°.

[0074] The angle sign being positive the process deduces that the terminal is in the “ZONE_IN” zone.

[0075] Note that the determination of the position of the TRM terminal in relation to one of the two areas of interest delimited by the plane perpendicular to the ground including the BAL_A and BAL_B beacons is independent of the orientation in space of the TRM terminal.

[0076] According to a particular embodiment of the invention, the angle to be considered by the method for determining the position of the TRM terminal relative to the two zones “ZONE_IN” and “ZONE_OUT” is the re-entrant angle . In this case, the method deduces that the terminal is in the “ZONE_IN” zone when the sign of the angle is negative and in the “ZONE_OUT” zone when the sign of the angle is positive.

[0077] Thanks to this localization process, there is no need for a physical barrier to materialize the separation between the "ZONE_IN" zone (i.e. the boarding platform) for which it is necessary to have a valid transport ticket and the "ZONE_OUT" zone which is freely accessible. Current infrastructures such as gates / porticos, turnstiles, automatic doors, etc. allowing access to a specific zone (in our case the boarding platform) are thus dematerialized.

[0078] According to a particular embodiment of the invention, as soon as the user enters the “ZONE_IN” zone with his TRM terminal (i.e. the platform), the method executes (ACTION step) an application (for example payment) capable of invoicing the user (calculation of a transport package or payment per action). Note that in this case, service data (name of the transport ticket, fare, electronic address allowing payment, timetables, name of the operator, bank details, etc.) allowing the purchase / invoicing may be known to the method and / or the application or obtained in one of the data received from the BAL_A beacon and / or the BAL_B beacon or from a server located in the network.The application can, as soon as the user enters the "ZONE_IN" zone with his TRM terminal, deduct a ticket from a set of tickets held by the user (tickets can be stored locally within the TRM terminal or in the network) or signal / notify a server of the transport operator (i.e. the operator of the T train) that the traveler has passed (case of a monthly package or deferred payment with aggregation of the costs of the journeys made by the user during a given period of time).

[0079] According to a particular embodiment of the invention, just before the user enters the “ZONE_IN” zone with his TRM terminal (i.e. near the virtual threshold symbolized by the line (BAL_A, BAL_B), for example 2 meters from it), the method triggers a payment pre-authorization with a confirmation request to the user. If the user confirms the prepayment and the latter crosses the virtual threshold, the payment becomes effective. Alternatively, a delay (for example 30 seconds) can be applied before the payment is effective in order to verify that the user does not cross the virtual threshold in the opposite direction.

[0080] According to a particular embodiment of the invention, as soon as the user enters the “ZONE_IN” zone with his TRM terminal (i.e. the platform), the method executes (ACTION step) an application capable of communicating with a conversational agent of the transport operator, for example in order to choose and pay for an adapted transport ticket. Note that the electronic address allowing the conversational agent of the transport operator to be contacted may be previously known to the method and / or the application or obtained in one of the data received from the BAL_A tag and / or the BAL_B tag.

[0081] According to a particular embodiment of the invention, the steps of reception GET1 and GET2 and calculation / determination CALC are carried out at regular time intervals. This embodiment makes it possible, for example, to check in real time whether or not the TRM terminal / device enters the area of ​​interest.

[0082] It goes without saying that the embodiment described above has been given for purely indicative purposes and is in no way limiting, and that numerous modifications can easily be made by those skilled in the art without departing from the scope of the invention. According to other particular embodiments of the invention, the invention also applies to other scenarios such as passing through a barrier in a car park, the entry of a vehicle onto a toll road, the boarding area in an airport terminal, crossing the threshold of a controlled space (cinema, performance hall, etc.), a limited and secure access area in a professional environment, etc.

Claims

Location method implemented by a location device, said device comprising at least a first and a second radio receiver distinct from each other, said method being characterized in that it comprises the following steps: - reception, by said first receiver, of at least one first location data item from a first transmitter and at least one second location data item from a second transmitter; - reception, by said second receiver, of at least one third location data item from said first transmitter and at least one fourth location data item from said second transmitter;- determination, as a function of said first, second, third and fourth data and of a position of said first and second receivers, of the position of said device in one of the two zones of interest delimited by a plane perpendicular to the ground, said plane comprising said first and second transmitters.; Location method according to claim 1 wherein the determining step comprises:- a first step of calculating a direction associated with each of said first and second transmitters as a function of said first, second, third and fourth data and as a function of said position of said first and second receivers;- a second step of calculating the re-entrant or salient angle produced by two half-lines originating from said device and comprising respectively the first and second transmitters;- a step of determining, as a function of the value of said angle, the position of said device relative to one of the two areas of interest delimited by a plane perpendicular to the ground, said plane comprising said first and second transmitters. A location method according to claim 1 wherein said first and third location data comprise an identifier of said first transmitter and said second and fourth location data comprise an identifier of said second transmitter. Location method according to claim 1 wherein at least one of said first, second, third and fourth location data comprises at least one identifier associated with at least one of said two areas of interest. Location method according to claim 1 wherein the step of reception by said first receiver is preceded by a step of obtaining at least one identifier associated with at least one of said two areas of interest. Location method according to claim 1 wherein the receiving and determining steps are carried out at regular time intervals. The location method of claim 1 wherein said first and second receivers and said first and second transmitters use UWB® wireless communication technology or 5G wireless communication technology according to 3GPP release 15 specifications and later. Location method according to claim 1 wherein the determination step is followed by a step of executing an application as a function of a service datum, said service datum being included in at least one of said first, second, third and fourth location datum. Location method according to claim 1 wherein the determination step is followed by a step of sending a message to a conversational agent identified by a conversational agent identifier included in at least one of said first, second, third and fourth location data. Location device, said device comprising at least a first and a second radio receiver distinct from each other, said device being characterized in that it comprises:- a first module for receiving, by said first receiver, at least one first location data item from a first transmitter and at least one second location data item from a second transmitter;- a second module for receiving, by said second receiver, at least one third location data item from said first transmitter and at least one fourth location data item from said second transmitter;- a module for determining, as a function of said first, second, third and fourth data and a position of said first and second receivers, the position of said device in one of the two areas of interest delimited by a plane perpendicular to the ground, said plane comprising said first and second transmitters.; Mobile terminal characterized in that it comprises a location device according to claim 10. Computer program comprising instructions for implementing the method according to any one of claims 1 to 9, when the program is executed by a processor.

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