Method and device for geolocating mobile devices, and program executing the method

Abstract

Method and device for geolocating a mobile device, and a program executing the method. The invention relates to a method and device for geolocating a mobile device, and a program executing the steps of the geolocation method. A mobile device is, in particular, any vehicle: land vehicle, aircraft, underground vehicle, etc., but also an individual, a transported object, etc. An object of the invention is a method for geolocating a mobile device comprising: - locating, relative to an optical fiber of an optical fiber network, a position of the mobile device based on an acoustic signal detected in a return signal at one end of the optical fiber, the acoustic signal having an acoustic signature of the mobile device. Thus, the geolocation of the mobile device cannot be interrupted or degraded by radio interference. Furthermore, it does not consume any energy useful to the mobile device during its movement. Finally, it allows the movement of the mobile device(s) to be tracked by a third party. Figure for the abstract: Figure 1.

Description

Title of the invention: Method and device for mobile geolocation, and program executing the method. Technical field

[0001] The invention relates to a method and device for geolocating a mobile device, and a program executing the steps of the geolocation method. The mobile device is, in particular, any vehicle: land vehicle, such as cars, motorcycles, trucks, trains, but also vulnerable vehicles: bicycles, scooters, etc.; aerial vehicles: drones, ultralight aircraft, etc.; underground vehicles: subways, etc.; but also an individual (person, animal, etc.), a moving object, etc. State of the art

[0002] Currently, the geolocation of land and air vehicles is carried out primarily using satellite systems such as GPS, Galileo, etc. Failure or jamming of the satellite geolocation system used results in a detrimental loss of information. In certain areas (valleys, buildings, etc.), GPS signals can be degraded. Furthermore, the processing of GPS signals by a geolocation system installed in a vehicle consumes energy from the vehicle.

[0003] In order to allow their geolocation, aircraft can then use radio beacons located on the ground whose signal is transformed into a position indication by receivers installed on board.

[0004] To enable the geolocation of aerial or land vehicles in the absence of a GPS signal, inertial sensors placed in the vehicle can also be used. Thus, the vehicle's inertial sensors can determine the vehicle's position relative to a known starting point. However, inertial sensors are subject to drift, which generates increasingly significant positioning errors. Furthermore, since these solutions are expensive, vehicles may be under-equipped with inertial sensors, making the determination of the vehicle's relative position inaccurate because they do not receive sufficient data.

[0005] On the road network, capturing the information provided by road signs, particularly while driving, allows for the determination of the vehicle's geolocation. However, this geolocation can be inaccurate. Indeed, the signs indicating upcoming towns give a distance in kilometers, and road markers are not present on all roads but only on main roads: departmental, national, etc. Furthermore, they consist of kilometer markers of varying sizes and markers every 100 meters on highways and expressways. Thus, Geolocation can be more or less precise depending on the type of boundary marker (kilometer, hectometer, etc.) or even its absence on some roads, and the difficulty of recognizing the boundary marker, particularly due to the dimensions of the boundary marker and / or the font size used on the boundary marker.

[0006] In addition, for automatic geolocation systems that mainly use cameras to locate themselves, this can pose some problems, especially if visibility is degraded.

[0007] In addition to vehicles, it is sometimes also useful to position people (personal safety, crowd management, commercial location, etc.). A satellite geolocation system installed in a mobile phone carried by the person can then be used, with the same drawbacks previously mentioned for vehicles.

[0008] For individuals using their mobile phones for geolocation, it may be possible, when GPS signals are degraded or even lost, to use the communication network (5G, 4G, 3G, LTE, etc.) to determine their position. However, the geolocation accuracy thus obtained is low and also depends on the size of the communication network cells covering the area where the person is located. Therefore, the accuracy of geolocation via a communication network is proportional to the density of the communication network: high accuracy in a densely connected area such as a city and low accuracy in a sparsely connected area such as the countryside. Furthermore, geolocation via a communication network is impossible in so-called "white zones," that is, areas not covered by the communication network to which the person subscribes, or even by any communication network (for emergency applications of the person's mobile phone).And, as with satellite geolocation (GP, Galileo...), the potential jamming of communication network signals generates a detrimental loss of information. Description of the invention

[0009] One of the aims of the present invention is to remedy the drawbacks / shortcomings of the prior art / to provide improvements over the prior art.

[0010] An object of the invention is a method for geolocating a mobile comprising: - locating relative to an optical fiber of an optical fiber network a position of the mobile based on an acoustic signal detected in a return signal at one end of the optical fiber, the acoustic signal comprising an acoustic signature of the mobile.

[0011] Thus, the geolocation of the mobile cannot be interrupted or degraded by radio jamming.

[0012] In addition, it allows the geolocation of a mobile device not containing an electronic device (geolocation of products during their delivery, of people, of light vehicles driven or autonomous...).

[0013] And also, the geolocation of the mobile does not consume any useful energy for the mobile in its movement.

[0014] Finally, it allows the geolocation of a mobile device by a third party for tracking the movement of the mobile device: fleet tracking, delivery tracking, locating people in distress...

[0015] Advantageously, the geolocation process comprises: - recognize the mobile based on the acoustic signature of the mobile in the detected distributed acoustic signal.

[0016] Thus, geolocation makes it possible to track several mobiles by being able to distinguish the type of mobile being tracked when the mobile has an acoustic signature common to other mobiles of the same type but distinct from mobiles of different types, see each mobile individually.

[0017] Furthermore, in the case where each mobile is recognized individually, this makes it possible to provide each mobile equipped with a receiver with the position determined by geolocation according to the invention.

[0018] Advantageously, the geolocation process comprises: - discriminate the mobile from another mobile based on the acoustic signature of the mobile distinct from another acoustic signature of the other mobile.

[0019] Thus, geolocation allows a third party to track several mobiles while being able to distinguish the located mobiles by means of distinct acoustic signatures for each mobile.

[0020] Advantageously, the geolocation process comprises: - discriminate the mobile from another mobile based on a last localized position of the mobile.

[0021] Thus, geolocation allows a third party to track several mobiles while being able to distinguish the mobiles located by reducing the number of distinct acoustic signatures used by the mobiles to be geolocated.

[0022] Advantageously, the discrimination of the mobile from another mobile based on the last localized position of the mobile comprises: - follow the mobile from a starting point known to the mobile.

[0023] Advantageously, the geolocation process comprises: - determine the position of the mobile on a map of the optical fiber network including the optical fiber as a function of the localized position of the mobile relative to the optical fiber and the known position of the optical fiber.

[0024] Thus, geolocation according to the invention allows several applications based on the location of the mobile, including navigation of the mobile when the position of the mobile is provided to a navigation system of the mobile, and / or navigation of a third vehicle when the position of the mobile is provided to a navigation system of the third vehicle, such as an emergency vehicle, and / or the management of a fleet of mobile devices.

[0025] Advantageously, the geolocation process comprises: - locate the mobile in a geographical area covered by a set of optical fibers of the optical fiber network based on localized positions of the mobile relative to several optical fibers of this set of optical fibers covering the geographical area.

[0026] Thus, the accuracy of the position of the mobile is increased since it uses the position of the mobile relative to several optical fibers.

[0027] Advantageously, the localization of the mobile in a geographical area involves: - triangulating the position of the mobile in the geographical area as a function of localized positions of the mobile relative to several optical fibers of this set of optical fibers covering the geographical area.

[0028] Advantageously, the geolocation process comprises: - record the position of the mobile determined by the geolocation process.

[0029] Advantageously, the acoustic signature of a mobile device is one of the following acoustic signals: - an acoustic signal emitted by the mobile during movement, - an acoustic identifier specific to the mobile.

[0030] Thus, in the case of an acoustic signal emitted by the mobile, the emission of this acoustic signal by the mobile does not consume any particular energy since it is generated "naturally" by one or more of the elements of the mobile during its movement: for example, the noise of the engine, the noise of the propellers...

[0031] And, in the case of an acoustic identifier, it can be a unique acoustic signal associated with a specific mobile device so that it can be individually distinguished from any other mobile device, for example an acoustic signal such as an infrasound containing the vehicle's registration plate when it is equipped with one, or an ultrasound containing the social security number of a person who is mobile or using the mobile device...

[0032] Advantageously, according to one implementation of the invention, the different steps of the process according to the invention are implemented by a software or computer program, this software comprising software instructions intended to be executed by a data processor of a geolocation device and designed to control the execution of the different steps of this process.

[0033] The invention therefore also relates to a program comprising program code instructions for the execution of the steps of the geolocation process according to the invention when said program is executed by a processor.

[0034] This program may 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.

[0035] An object of the invention is also a mobile geolocation device comprising: - a mobile locator relative to an optical fiber of an optical fiber network capable of providing a position of the mobile based on an acoustic signal detected in a return signal at one end of the optical fiber, the acoustic signal having an acoustic signature of the mobile.

[0036] Advantageously, the geolocation device comprises one or more of the following devices: - a return signal analyzer capable of analyzing a return signal, in particular an optical or electronic return signal, corresponding to the reflection of a probe return signal, called a probe signal, by the optical fiber of the optical fiber network, the probe signal having been emitted on the optical fiber; - an acoustic extractor capable of extracting an acoustic signal from the return signal; - a sound recognition device capable of recognizing an acoustic signal included in the return signal; - a mapping database of the optical fiber network including optical fiber.

[0037] Advantageously, the sound recognition device is an artificial intelligence device.

[0038] Advantageously, the geolocation device includes a transmitter of the location of the mobile to a receiver among the following: - a receiver of a mobile manager; - a localized mobile receiver. Brief description of the drawings

[0039] The features and advantages of the invention will become clearer upon reading the description, given by way of example, and the related figures which represent:

[0040] [Fig. 1], a simplified diagram of a method for geolocating a mobile device according to the invention,

[0041] [Fig.2], a simplified diagram of the geolocation process of a mobile device in which The location relative to a fiber optic cable is detailed.

[0042] [Fig.3], a simplified diagram of a mobile geolocation device according to the invention,

[0043] [Fig.4], an example of a use case of a geolocation device according to the invention. Description of the implementation methods

[0044] Acoustic signal is understood in particular to include sound signals, and by extension to signals of inaudible frequencies, such as infrasound and ultrasound; and more broadly to include signals induced by vibratory signals; etc.

[0045] The signals carried (communication signal sc, sounding signal ps, return signal sr) by an optical fiber are radiation signals, in particular light signals, for example in the form of laser pulses, infrared, ultraviolet, etc.

[0046] Fig. 1 illustrates a simplified diagram of a geolocation method according to the invention.

[0047] The method for geolocating a mobile M_LOC comprises: - locate LOC / p^... LOCfpj relative to an optical fiber Fi .. .,Fj (j=1... J, J being a non-zero integer) of an optical fiber network FN a position pOS^j,... pOS^} , pos^.... pos^ of the mobile Mb...,Mn (n=l...N, N being a non-zero integer) as a function of an acoustic signal sai...saj detected in a return signal sri...sq at one end of the optical fiber Fi.. .Fj, the acoustic signal sai...saj having an acoustic signature of the mobile • • • sSMn.

[0048] Optionally, for a first mobile Mi, only the optical fibers of a first set of optical fibers FN^ = {, ( Æj, k, qq / ] {F^ ] □ {F / } FN^ □ FN) of the optical fiber network allow the acoustic signature of the SSM mobile to be detected (notably due to the proximity of the first mobile of this first set of optical fibers and the distance of the first mobile from the optical fibers of the optical fiber network not belonging to this first set FN1). And, in general, for an nth mobile Mn, only the optical fibers of an nth set of optical fibers FNn = {F^}( {F1 □ 1F j} .et FN„ □ FN) of the optical fiber network allow the acoustic signature of the SSM„ mobile to be detected.

[0049] Then, the location LOC / Fi... LOC^pj relative to an optical fiber Fi ... ,F j (j=l...J, J being a non-zero integer) of an optical fiber network FN provides a position wisf ■■■' dum^^ Mmj, depending on an acoustic signal sai...saj detected in a return signal sri...srj to one end of the optical fiber Fi.. .Fj, if the acoustic signal sai...saj has an acoustic signature of the mobile SSM] • • • sSMa.

[0050] Optionally, the same optical fiber Fj allows the detection of one or more acoustic signals saju (u=l...U) corresponding to different locations of the acoustic signals along the optical fiber.

[0051] In particular, the M_L0C geolocation method comprises: - locate GLOC the mobile Mb.. .,Mn in a geographical area ZG covered by a set of optical fibers {Fj]jj, j >i of the optical fiber network FN according to localized positions of the mobile relative to several optical fibers pos^,... posF} . ..., pos^l ... pos^j of this set of optical fibers {Fj}j covering the geographical area ZG: P°sma ' ' ' P0SMn-

[0052] Locating the mobile Mb... ,Mn in a geographical area ZG consists in particular of locating a geographical position of the mobile Posmi ' ' ' P°SMn-

[0053] In particular, the GLOC location of the mobile Mb... ,Mn in a geographical area ZG comprises: - Triangulate A the position of the mobile Mb.. ,,Mn in the geographical area ZG as a function of the localized positions pos^... pos^ , ..., P0^^ • • ■ POS^ located of the mobile Mi, Mn relative to several optical fibers Fi t.. .,Fj of this set of optical fibers {Fj}j covering the geographical area ZG: Posm\ ' ' 'P°SMn-

[0054] In particular, the M_LOC geolocation process comprises: - Position MP_LOC, a representation of the mobile on a map mp, according to the localized position of the mobile P°SM\ ' ' ' P°SMn, posFl,... pos^ , .... posFj,... posFj , * M\ ' Mn l M\ ' Mn and the known position of at least one optical fiber P°sp^ ■ • • P°$pj, the MP_LOC positioning provides a map mp* including the representation of the mobile:

[0055] In particular, the M_LOC geolocation process comprises: - record SV position determined by the M_LOC geolocation process.

[0056] In particular, the acoustic signature of a mobile ■ ■ ■ sSMn is one of the following acoustic signals: - an acoustic signal emitted by the mobile device Mb...,Mn during movement, - an acoustic identifier specific to the mobile Mb...,Mn.

[0057] An optical fiber network is deployed in an external environment. It includes, in particular, a network of optical fibers, such as aerial and / or underground optical fibers. All or part of the optical fiber network constitutes, in particular, a communication network. In particular, a communication signal sc is transmitted via one of the optical fibers Fi.. .Fj of the communication network FN.

[0058] The external environment includes at least one mobile Mi.. .Mn moving within the external environment, more specifically within the geographical area ZG of the external environment covered by the optical fiber network FN. The mobile Mi ...Mn emits an acoustic signal ssi...ssn during its movement. Optionally, the acoustic signal ssi... ssn is generated by an element of the mobile Mi.. .Mn (for example, a motor of the mobile, the friction of the mobile's wheels on a road, a propeller of the mobile...) during this movement and / or triggered by the movement of the mobile (in particular, a transmitter of an acoustic identifier of the mobile is triggered by a movement of the mobile, for example by means of the mobile's accelerometer).

[0059] In particular, when the mobile is a product that does not generate vibration, a vibrating patch with a particular acoustic signature can be applied to it, in particular an emitter of an acoustic identifier or a patch composed of a material that vibrates when the object is moved.

[0060] Thus, it enables the geolocation of a mobile device without electronic components (geolocation of products during delivery, of people, of driven or autonomous light vehicles, etc.). A probing signal psb ..., pSj is transmitted PS_EM (not shown) on an optical fiber Fi ..., Fj, particularly an aerial fiber, of the optical fiber network FN. In particular, the M_LOC location method involves the transmission of the probing signal psb ..., pSj (not shown). The probing signal ps is optionally modulated according to a wavelength λi. In particular, when the optical fiber, particularly an aerial fiber, Fi ..., Fj already carries a communication signal sc (not shown), the wavelength used to modulate the probing signal ps, called the probing wavelength, is distinct from the wavelength λu of the communication signal sc, called the useful wavelength λp* Xu.

[0061] The optical fiber, particularly aerial, Fi ..., Fj, more specifically the small defects of the optical fiber, particularly aerial, Fi ..., Fj reflect the probing signal psb ..., pSj. Thus, a return signal srb ..., sq consisting of the reflection(s) of the probing signal psb ..., pSj by the optical fiber, particularly aerial, Fi ..., Fj is received SR_RC (not illustrated).

[0062] It should be noted that the vibrations linked to the acoustic signals ssi... ssn from mobiles Mb Mn, in particular to the sound signals from sound sources, passing through the optical fiber, in particular aerial, Fi ..., Fj carrying the sounding signal psb ..., pSj slightly modify the return signal srb ..., sq, in particular the shape and / or the position of the defects which induces a slight phase shift of the reflection sr of the sounding signal psb ..., pSj.

[0063] In particular, distributed acoustic capture, also called distributed acoustic detection, DAS (see [Fig.2]) comprises at least one of the following steps: - to emit PS_EM (not illustrated), on the optical fiber, particularly aerial, Fi ..., Fj of the optical fiber network FN, a probing signal psb ..., pSj, the probing signal psi , ..., pSj being a light signal suitable for transmission via the optical fiber, particularly aerial, Fi ..., Fj; and - receive SR_RC (not illustrated) a return signal srb ..., sq corresponding to the reflection of the sounding signal psb ..., pSj by the optical fiber, especially aerial, Fi ..., Fj.

[0064] In particular, the SR_RC return signal reception and / or the DAS distributed acoustic capture process converts O / E_CNV (not shown) the optical return signal srb ..., sq from the optical fiber, in particular aerial, Fi ..., Fj into an electronic return signal sr'b ..., sr'j (not shown).

[0065] In particular, the distributed acoustic capture process DAS is an optoelectronic process, that is to say a process operating both on optical signals: the probing signal psb ..., pSj emitted on the optical fiber, in particular aerial, Fi, ..., Fj and / or the return signal srb ..., sq received from the optical fiber, in particular aerial, Fi ..., Fj, and electronic signals: the electronic return signal sr'b ..., sr'j obtained as a function of the optical return signal srb ..., sq received.

[0066] In particular, the M_L0C geolocation process comprises one or more of the following steps: - emit the PS_EM polling signal (not shown); - receive SR_RC return signal (not shown); - perform a distributed acoustic capture DAS (see [Fig.2]).

[0067] In particular, the location relative to an optical fiber LOC^ ... LOC^j comprises: - perform a distributed acoustic capture DAS (see [Fig.2]).

[0068] In particular, the distributed acoustic capture DAS provides the acoustic signal sai ...saj detected in a return signal sri...sq at one end of the optical fiber Fi.. .Fj.

[0069] The location relative to an optical fiber LOCtF[ ... LOC^ provides a position of the mobile Mb ..., Mn relative to the optical fiber Fi ..., Fj :

[0070] Optionally, the geographic location GLOC provides a geographic position Posmi ' ' ' P°SMn of the mobile Mb.. .,Mn as a function of positions pos^ ... pos^f, ..., pos^^ ... pos^in of the mobile Mb... ,Mn relative to several optical fibers Fi ..., Fj provided by locations of the mobile relative to distinct optical fibers LOC / FÏ... LOCjFj : •••• P0^)' '

[0071] In a first variant, the geographic location GLOC comprises a triangulation A of positions pos^^... pos^ , ..., po^^ • • • Pos^ of the mobile Mb .. .,Mn relative to several optical fibers Fi ..., Fj provided by locations of the mobile relative to distinct optical fibers LOCp,... LOC^j to provide a geographic position Posmi ' ' ' POSMn of the mobile Mb.. .,Mn : P^^P^r ■■■' ■■■• PO^^P^ -P™^

[0072] In a second variant, the geographic location GLOC includes a triangulation A of the acoustic signatures of the mobile Mb...,Mn in acoustic signals detected sal... saj from several optical fibers Fi ..., Fj to provide a geographic position P°smi ' ' ' P0SMn of the mobile Mb.. .,Mn.

[0073] A geographical position is notably provided in the form of geographical coordinates on Earth (called GPS coordinates by abuse of language), mathematical coordinates relating to the geographical area (orthogonal coordinates, polar coordinates...), etc.

[0074] A geographical position is in particular a two-dimensional position in the case of a land-based mobile or a three-dimensional position in the case of an aerial, underwater, or even terrestrial mobile.

[0075] In particular, the M_LOC geolocation method comprises: - recording the position SV pos?^ ... posF} . ..., pos^i,... po^j ; pos„,... pos^ of the mobile Mb ..., Mn determined by the geolocation process M_LOC, in particular the, or even the, position(s) pos^ ... pos^ ..., pos?^ ... pos1^ of the mobile Mb... ,Mn relative to one, or even several, optical fiber(s) Fi ..., Fj, and / or the position P°smï ' * ' P0SMn of the mobile Mb...,Mn.

[0076] In particular, the position(s) of the mobile Mb ..., Mn is / are recorded in a storage device, possibly a BPos position storage device, such as a memory, a database, etc.

[0077] In particular, the M_L0C geolocation process comprises: - determine MP_DT (not illustrated) the position • • • ' ■ • • P°^in of the mobile on a map mp of the geographical area ZG covered by the optical fiber network FN as a function of the localized position of the mobile P°sm[ ' ' ' P°SMn, P^m -P0^,,- -• P^-P0^,

[0078] In particular, the M_L0C geolocation process comprises: - Determine MP_DT (not illustrated) the position pos'^... po^n, ..., P08^ • • ■ P08^ of the mobile on a map mp of the optical fiber network including the optical fiber as a function of the localized position of the mobile P°8m\ ' ' ' P°SMn, pos^ ... POS^ , ..., POS1^ ■ - • Posm ' ct 'a known position of the optical fiber posFÏ ...pos^

[0079] In particular, the determination MP_DT of position(s) pos™ / ... pos^f, ..., pos™ / ... pos^f of the mobile on a card mp of the optical fiber network FN containing the optical fiber Fi ..., Fj retrieves MP_LD the mp card of the geographical area ZG, on which are possibly indicated the positions POSF^... posFj of the optical fibers Fi ..., Fj. The mp card is, for example, retrieved in a storage device, in particular a BMP card storage device, such as a memory or a card database.

[0080] In particular, the M_L0C geolocation method comprises: - Position MP_LOC, a representation of the mobile device on a map mp, according to the localized position of the mobile device P°smy ' ' ' P°SMn, pos?},... DOS?} , ..., pos^j,... pos1^ , rr Mn rr Mn and the known position of at least one optical fiber P°s• • • Pospj, the MP_LOC positioning provides an mp* map including the representation of the mobile:

[0081] In particular, the M_L0C geolocation process comprises: - position MP_LOC a representation of the mobile on a map mp according to the determined position of the mobile P08'^ ■ • • P°8^p • • • ' P01^ ' ' ' P^Mn on a map mp, the positioning MP_LOC provides a map mp* including the representation of the mobile: mp* ( pos^ ), mp* ( { posMn} „ ) • •.

[0082] In particular, the M_L0C geolocation process comprises: - reproducing the mp* map including the representation of the mobile device:

[0083] A representation of the mobile on a map is in particular an arrow, a position icon... Optionally, the representation of the mobile has a parameter depending on the type of mobile, such as a colour parameter, a shape parameter (car, plane, drone, pedestrian, etc.)... In addition, the representation of the mobile may include an identifier of the mobile (number, name, etc.).

[0084] Figure [Fig.2] illustrates a simplified diagram of the geolocation process of a mobile in which the location relative to a fiber is detailed.

[0085] The M_LOC geolocation method for a Mi mobile device comprises: - to locate LOC / Fj relative to an optical fiber Fj of an optical fiber network FN a position pos^ of the mobile Mi as a function of an acoustic signal saj detected in a return signal sq at one end of the optical fiber Fj, the acoustic signal saj having an acoustic signature of the mobile ^Mn-

[0086] In particular, the M_L0C geolocation process comprises: - recognize RCG the Mi mobile based on the acoustic signature of the sSmi mobile in the detected distributed acoustic signal saj.

[0087] In particular, the M_LOC geolocation process comprises: - discriminate MDSC mobile Mi from another mobile Mn (see [Fig.l]) according to the acoustic signature of mobile s%m\ distinct from another acoustic signature of the other mobile sSMn: sgMA sgMn, * Mn.

[0088] In particular, the M_LOC geolocation process comprises: - discriminate POS_DSC mobile Mi from another mobile Mn based on a last localized position of the mobile posed- 1).

[0089] In particular, the discrimination of the mobile against another mobile MDSC, POS_DSC includes: - follow FLW the Mi mobile from a starting point known to the mobile.

[0090] In particular, the determination MP_LOC of the position of the mobile on a map of the optical fiber network comprising the optical fiber.

[0091] At least one optical fiber Fj, such as an aerial or underground optical fiber, is deployed in an external environment. Optionally, an optical fiber network comprises at least one optical fiber Fj and constitutes an optical fiber network FN, as illustrated in [Fig. 1]. In particular, a communication signal sc is transmitted via one of the optical fibers Fi...Fj of the optical fiber network FN.

[0092] The external environment includes at least one mobile Mi moving within the external environment, more specifically within the geographical area ZG of the external environment covered by at least one optical fiber Fj. The mobile Mi emits an acoustic signal ssi during its movement. Optionally, the acoustic signal ssi is generated by an element of the mobile Mi (for example, a motor of the mobile, the friction of the mobile's wheels on a road, a propeller of the mobile...) during this movement and / or triggered by the movement of the mobile (in particular, a transmitter of an acoustic identifier of the mobile is triggered by a movement of the mobile, for example by means of the accelerometer of the mobile).

[0093] A probing signal pSj is emitted PS_EM (not shown) on at least one optical fiber Fj. In particular, the localization method M_LOC includes the emission of the probing signal pSj (not shown).

[0094] The optical fiber Fj, more particularly the small defects of the optical fiber Fj, reflect the probing signal pSj. Thus, a return signal sq consisting of the reflection(s) of the probing signal pSj by the optical fiber Fj is received SR_RC (not illustrated).

[0095] It should be noted that vibrations, audible or not, linked to acoustic signals ssi from mobiles Mb in particular to sound signals from sound sources or to vibratory signals from vibratory sources, passing through the optical fiber Fj carrying the sounding signal pSj slightly modify the return signal sq, in particular the shape and / or the position of the defects which induces a slight phase shift of the reflection sr of the sounding signal pSj.

[0096] In particular, a distributed acoustic capture, also called distributed acoustic detection, DAS comprises at least one of the following steps: - to emit PS_EM (not illustrated), on the optical fiber Fj, a probing signal pSj, the probing signal pSj being a light signal suitable for transmission via the optical fiber Fj; and - receive SR_RC (not illustrated) a return signal sq corresponding to the reflection of the sounding signal pSj by the optical fiber Fj.

[0097] In particular, the SR_RC return signal reception and / or the DAS distributed acoustic capture process converts O / E_CNV (not shown) the optical return signal sq from the optical fiber Fj into an electronic return signal sr'j (not shown).

[0098] In particular, the distributed acoustic capture process DAS is an optoelectronic process, that is to say a process operating both on optical signals: the probing signal pSj emitted on the optical fiber Fj and / or the return signal sq received from the optical fiber Fj, and on electronic signals: the electronic return signal sr'j obtained as a function of the optical return signal sq received.

[0099] In particular, the M_L0C geolocation process comprises one or more of the following steps: - emit the PS_EM polling signal (not shown); - receive SR_RC return signal (not shown); - perform a distributed acoustic capture (DAS).

[0100] In particular, the location relative to an optical fiber LOCIF[... LOC^ comprises: - perform a distributed acoustic capture (DAS).

[0101] In particular, the distributed acoustic capture DAS provides the detected acoustic signal saj in a return signal sq (optical or electronic sr'j) at one end of the optical fiber Fj.

[0102] In particular, the distributed acoustic capture (DAS) comprises: - check if the return signal sq, in particular the electronic return signal, includes an acoustic signal saj: srj Z) sajl.

[0103] The verification srj Z) saf? at time t triggers at least one subsequent step of the distributed acoustic capture DAS on the return signal sq at time t: sq(t) if the return signal sq contains an acoustic signal saj. Optionally, otherwise, the verification triggers a distributed acoustic capture DAS at the following time t+1.

[0104] In particular, the distributed acoustic capture (DAS) comprises: - extract AXT an acoustic signal saj from the return signal sq, in particular the electronic return signal.

[0105] In particular, AXT extraction is performed if the srj Z) Sdjl check determines that the return signal sq includes an acoustic signal saj. The extracted acoustic signal saj includes, in particular, an acoustic signature s&m\ of the mobile Ml: saj 3 sSMi.

[0106] In particular, the distributed acoustic capture (DAS) comprises: - locate ALOC at least one position pos(saj) relative to the acoustic signal saj in the return signal sq.

[0107] In particular, the localization of the ALOC acoustic signal is performed if the verification srj Z) sa^ determines that the return signal sq contains an acoustic signal saj. Optionally, the localization of the acoustic signal is performed based on the extracted acoustic signal saj and / or the AXT extraction. By position relative to the acoustic signal pos(saj) is understood in particular to mean one or more positions relative to the acoustic signature(s) included s^ma in the acoustic signal saj.

[0108] In particular, the distributed acoustic capture DAS provides the acoustic signal saj of the return signal sq and / or the position of the acoustic signal pos(saj).

[0109] In particular, RCG recognition identifies, in the detected acoustic signal saj, notably provided by distributed acoustic capture DAS, of the return signal sq, either a mobile Ml: idMb or a mobile type: tyMi. RCG recognition is notably a function of an acoustic signature of a mobile SSMÏ included in the detected acoustic signal saj.

[0110] Optionally, RCG recognition is performed based on a mobile identifier and / or mobile type previously associated with an acoustic signature. This pair: identifier and / or mobile type, acoustic signature is notably pre-recorded, for example, in a BA storage device, such as memory, an acoustic database, etc.

[0111] This recording results, for example, from prior training of acoustic signature(s). Alternatively or in a complementary manner, RCG recognition is performed by artificial intelligence.

[0112] Optionally, RCG recognition allows MDSC discrimination of a mobile Ml relative to other mobile(s) Mn.

[0113] In particular, a FLW tracking of a mobile Ml is carried out from a known position of the mobile Mb, in particular from the position posMi(t-1) determined at the previous time t-1 and / or from a known starting position P0*^ ( 0 ) •

[0114] Optionally, FLW tracking allows discrimination based on the POS_DSC position of a mobile Mi relative to other mobile(s) Mn. In particular, FLW tracking and / or discrimination based on the POS_DSC position also allows determining the current position of the mobile (pos^t) relative to the optical fiber Fj. Specifically, the current position (pos1^(t)) of the mobile Mi relative to the optical fiber Fj is a function of the position of the detected acoustic signal (pos(saj)), and possibly of one or more previous positions of the mobile Mi: (pos(0)... pos^0). The previous positions (pos^t) are notably provided or retrieved from a mobile position storage device (BPos), such as a memory, a position database, etc.

[0115] In particular, the M_LOC localization method comprises: - locate M_LOC / F a mobile Mi relative to an optical fiber Fj.

[0116] In particular, the localization of a mobile relative to an optical fiber M_LOC / F associates the position of the mobile relative to a fiber at time t pos^^t} with the identifier of the mobile idM[ and / or the type of mobile tyMb. The position of the mobile pOS^j ( t ) is notably the position of the acoustic signal pos(saj) when it only includes a position of a mobile Mb, the position associated with the acoustic signature of the mobile Ml pos( sgMX ) or a position as a function of one or more previous positions of the mobile relative to an optical fiber P0SMl(0)...

[0117] The location relative to an optical fiber LOC / Fj provides a position of the mobile Mi relative to the optical fiber Fj: pos^.

[0118] Optionally, the location relative to an optical fiber LOC / Fj provides a pair associating the position of the mobile Mi relative to the optical fiber Fj: pos^ with a mobile identifier Mi idM[ and / or a mobile type Mb

[0119] In a particular embodiment of one of the methods illustrated by Figures 1 and 2, a program includes program code instructions for executing the steps of the geolocation method according to any one of the preceding claims when said program is executed by a processor.

[0120] Figure [Fig. 3] illustrates a simplified diagram of a mobile geolocation device according to the invention.

[0121] The geolocation device of a mobile 3 comprises: - a locator 331...33j of the mobile 0Mi relative to an optical fiber 1 li... 1 lj of an optical fiber network 1 capable of providing a position • • • P°s^n of the mobile 0Mi as a function of an acoustic signal sai...saj detected in a return signal sri...sq at one end of the optical fiber 111... 1 lj, the acoustic signal sai... saj having an acoustic signature of the mobile

[0122] In particular, the geolocation device 3 comprises one or more of the following devices: - a return signal analyzer 331 capable of analyzing a return signal sri...sq, in particular an optical or electronic return signal, corresponding to the reflection of a probing signal psB ..., pSj by the optical fiber lli...llj of the optical fiber network 1,1e probing signal psb ..., pSj having been emitted on the optical fiber 111... 1 lj; - an acoustic extractor 3311 capable of extracting an acoustic signal from the return signal; - a sound recognition device 3321 capable of recognizing an acoustic signal sai... saj included in the return signal sri... sq; - a mapping database of the optical fiber network including optical fiber.

[0123] In particular, the sound recognition device 3321 is a data processing device, including in particular an artificial intelligence device.

[0124] In particular, the geolocation device 3 includes a transmitter 37 of the location of the mobile intended for a receiver among the following: - a receiver 47 (not illustrated) of a mobile manager 4; - a 07M[ receiver (not shown) of the mobile located 0Mi.

[0125] An optical fiber network is deployed in an external environment 0. It includes, in particular, an optical fiber network 1, such as aerial and / or underground optical fibers. In particular, a communication signal sc is transmitted via one of the optical fibers 111... 1 lj of the optical fiber network 1.

[0126] The external environment 0 comprises at least one mobile 0Mi moving within the external environment 0, more particularly within a geographical area of ​​the external environment covered by the optical fiber network 1. The mobile 0Mi emits an acoustic signal ssi during its movement. Optionally, the acoustic signal ssi is generated by an element of the mobile 0Mi (for example, a motor of the mobile, the friction of the mobile's wheels on a road, a propeller of the mobile, etc.) during this movement and / or triggered by the movement of the mobile (in particular, a transmitter (an acoustic identifier of the mobile is triggered by a movement of the mobile, for example by means of the mobile's accelerometer).

[0127] In particular, a transmitter 21 is capable of transmitting a psb ..., pSj sounding signal on an optical fiber 1 h ..., 1 lj, in particular aerial, of the optical fiber network 1. In particular, the locator 3 includes the transmitter 21 of psb ..., pSj sounding signals.

[0128] The optical fiber 1 h ..., 1 lj, more particularly the small defects of the optical fiber lli ,• • •, 1 lj reflect the probing signal psb ..., pSj. Thus, a return signal srb ..., sq is constituted by the reflection(s) of the probing signal psb ..., pSj by the optical fiber l h ..., 1 lj. In particular, a receiver 22 is capable of receiving the return signal srb ..., sq. In particular, the locator 3 includes the receiver 22 of return signals srb ..., sq.

[0129] In particular, an optical transmitter 2b 32i... 2j, 32j is suitable for: - to transmit a probing signal psb ..., pSj on an optical fiber 111 ..., 1 lj, in particular aerial, of the optical fiber network 1, and to - capable of receiving a return signal srb ..., sq is constituted by the reflection(s) of the probing signal psb ..., pSj by the optical fiber l li ..., 1 lj.

[0130] In particular, the locator 3 includes the optical transmitter 32i... 32j with the optical fiber 111 ..., 1 lj.

[0131] In particular, the optical transmitter 2b 32i...2j, 32j comprises at least one of the following devices: - transmitter 21 capable of transmitting a psb ..., pSj probing signal on a 1 h .... 1 1 optical fiber, : - the receiver 22 capable of receiving the return signal srb ..., sq of the optical fiber 1 h ..., 11.

[0132] In particular, a distributed acoustic sensor, also called a distributed acoustic detector, 33b..33j comprises at least one of the following devices: - the transmitter 21 capable of transmitting, on the optical fiber 111 ..., 1 lj, of the optical fiber network 1, a probing signal psb ..., psj5 the probing signal psb ..., pSj being a light signal capable of being transmitted by the optical fiber 1 h ..., 1 lj; - the receiver 22 capable of receiving a return signal srb ..., sq corresponding to the reflection of the probing signal psb ..., pSj by the optical fiber l 11 ..., 1 lj; - the optical transmitter 32i... 32j with optical fiber 111,..., 1 lj.

[0133] In particular, the distributed acoustic sensor is also a device such as a "Distributed Acoustic Sensing" in English or DAS.

[0134] In particular, the return signal receiver 22 and / or the distributed acoustic sensor 331 is capable of converting (not shown) the optical return signal srb ..., sq from the optical fiber 111 ..., 1 lj into an electronic return signal sr' b ..., sr'j (not shown). In particular, the return signal receiver 22 and / or the distributed acoustic sensor 331 includes an optoelectronic converter 23 (not shown) capable of converting the optical return signal sq, ..., sq from the optical fiber 111 ..., 1 lj into an electronic return signal sr'i, sr'j (not shown).

[0135] In particular, the distributed acoustic sensor 331 is an optoelectronic device, that is to say a device operating both on optical signals: the probing signal psb ..., pSj emitted on the optical fiber 111 ..., 1 lj and / or the return signal srb ..., sq received from the optical fiber 1 h ..., 1 lj and electronic signals: the electronic return signal sr' b ..., sr'j obtained as a function of the optical return signal sq, ..., sq received.

[0136] In particular, the geolocation device 3 comprises one or more of the following devices: - the transmitter 21 capable of transmitting, on the optical fiber 111 ..., 1 lj, of the optical fiber network 1, a probing signal psb ..., pSj, the probing signal psb ..., pSj being a light signal capable of being transmitted by the optical fiber 111 ..., 1 lj; - the receiver 22 capable of receiving a return signal srb ..., sq corresponding to the reflection of the probing signal psb ..., pSj by the optical fiber l 11 ..., 1 lj; - the optical transmitter 32i... 32j with optical fiber 111 ..., 1 lj; - the distributed acoustic sensor 331.

[0137] In particular, the locator relative to an optical fiber 331... 33j comprises: - the distributed acoustic sensor 331.

[0138] In particular, the distributed acoustic sensor 331 is capable of providing the acoustic signal sai... saj detected in a return signal sri... sq at one end of the optical fiber 111 ..., 1 lj.

[0139] In particular, the distributed acoustic sensor 331 comprises: - a 3310 verifier capable of verifying whether the return signal sq, in particular the electronic return signal, includes an acoustic signal saj: sr' j D sa fl.

[0140] The verifier 3310 is capable, at a given time t, of triggering at least one device of the distributed acoustic sensor 331 on the return signal sq at time t: sq(t) if the return signal sq includes an acoustic signal saj. Alternatively, the verifier 3310 is capable of triggering the distributed acoustic sensor 331 at the following time t+1.

[0141] In particular, the distributed acoustic sensor 331 comprises: - an acoustic signal extractor 3311. In particular, the extractor 3311 is capable of extracting an acoustic signal saj from the return signal sq, in particular the electronic return signal.

[0142] In particular, the extractor 3311 is triggered if the verifier 3310 determines that the return signal sq contains an acoustic signal saj. The extracted acoustic signal saj notably includes an acoustic signature sSMi of the mobile Ml: saj 3 sSMi.

[0143] In particular, the distributed acoustic sensor 331 comprises: - an acoustic signal locator 3312. The locator 3312 is in particular capable of locating at least one position pos(saj) relative to the acoustic signal saj in the return signal sq.

[0144] In particular, the acoustic signal locator 3312 is triggered if the checker 3310 determines that the return signal sq contains an acoustic signal saj. Optionally, the acoustic signal locator 3312 is capable of locating the position pos(saj) relative to the acoustic signal saj as a function of the extracted acoustic signal saj and / or the extractor 3311. By position relative to the acoustic signal pos(saj) is understood in particular to mean one or more positions relative to the acoustic signature(s) included s§mi in the acoustic signal saj.

[0145] In particular, the distributed acoustic sensor 331 is capable of providing the acoustic signal saj of the return signal sq and / or the position of the acoustic signal pos(saj).

[0146] In particular, the geolocation device 3 comprises: - a mobile recognition device 3321. In particular, the recognition device is capable of recognizing a mobile 0Mi based on the acoustic signature of the mobile sSMi in the detected distributed acoustic signal saj.

[0147] In particular, the recognition device 3321 is capable of identifying, in the detected acoustic signal saj, notably provided by the distributed acoustic capture DAS, of the return signal sq, either a mobile 0Mi: idMb or a mobile type: tyMi. Optionally, the recognition device 3321 is capable of recognizing a mobile 0Mi based on an acoustic signature of a mobile s8mi included in the detected acoustic signal saj.

[0148] Optionally, the recognition device 3321 is capable of performing recognition based on a mobile identifier and / or mobile type previously associated with an acoustic signature. This pair: identifier and / or mobile type, acoustic signature is notably previously recorded, for example, in a storage device 31 (see [Fig. 4]), such as a memory, an acoustic database...

[0149] As a complement or alternative, the recognition device 3321 is carried out by an artificial intelligence device.

[0150] Optionally, the recognition device 3321 is capable of enabling discrimination of a mobile Ml relative to other mobile(s) Mn.

[0151] In particular, the geolocation device 3 comprises: - a mobile discriminator 332 capable of discriminating mobile Mi against another mobile Mn based on the acoustic signature of mobile s£mi distinct from another acoustic signature of the other mobile s&Mn: SSMA ÿSMn^ Mj * Mn.

[0152] In particular, the mobile discriminator 332 relative to other mobile(s) includes the recognition device 3321.

[0153] In particular, a mobile tracking device (not illustrated) is capable of tracking the mobile 0Mi from a known position of the mobile 0Mi, in particular from the position determined at the previous time t-1 and / or from a known starting position ^Mî(0).

[0154] In particular, a mobile position discriminator 3323 is capable of discriminating the mobile based on the position of a mobile 0Mi relative to other mobile(s) Omh*

[0155] Optionally, the mobile tracking device is capable of enabling discrimination based on the position of a mobile 0Mi relative to other mobile(s) 0Mn- For example, the mobile discriminator on position 3323 includes the mobile tracking device (not shown).

[0156] In particular, the mobile tracking device (not shown) and / or the mobile position discriminator 3323 is also capable of determining the current position of the mobile pos^^t ) relative to the optical fiber Fj. In particular, the current position pOS^^t ) of the mobile Mi relative to the optical fiber Fj is a function of the position of the detected acoustic signal pos(saj), and possibly of one or more previous positions of the mobile Mi: posMl(0)... pos^^t- 1) • The previous positions posMi( 0 )... pos^(0) are notably provided or retrieved in a mobile position storage device 3324, such as a memory, a position database...

[0157] In particular, the location device 3 comprises: - a locator 33b ..., 33j capable of locating a mobile 0Mi relative to an optical fiber 1 Ij.

[0158] In particular, the locator of a mobile relative to an optical fiber 3325 associates the position of the mobile relative to a fiber at time t pose) with the identifier of the mobile idM[ and / or the type of mobile tyMp The position of the mobile pos^Çt) is in particular the position of the acoustic signal pos(saj) when it only includes a position of a mobile 0Mi, the position associated with the acoustic signature of the mobile 0Mi pos() or a position as a function of one or more previous positions of the mobile relative to an optical fiber P0SMX(0)... pos^(t - 1 ) •

[0159] In particular, the locator relative to an optical fiber 331... 33j is capable of providing a position of the mobile 0Mi relative to the optical fiber 1 h ..., 1 lj : POS^}, pos^j,-

[0160] Optionally, the locator relative to an optical fiber 331...33j is capable of providing a pair associating the position of the mobile 0Mi relative to the optical fiber 1lj with an identifier of the mobile 0Mi: idMi and / or a mobile type 0Mp tyMb

[0161] In particular, the geolocation device 3 comprises: - a mobile locator 34 of 0Mi in a geographical area covered by a set of optical fibers {11 j}ji i. j>i of the optical fiber network 1, called the geographical locator. The geographical locator 34 is particularly capable of locating a mobile 0Mi in the geographical area based on the localized positions of the mobile relative to several optical fibers pos^ Pos^\ this set of optical fibers {11 j}j covering the geographical area: Posmï P0SMn-

[0162] The geographic locator 34 of mobile Mi in a geographic zone ZG is particularly capable of providing a geographic position of the mobile P°smi P°SMn-

[0163] Optionally, the geography locator 34 is capable of providing a geographic position Posma ' ' ' P°SMn of the mobile 0Mb.. .,0Mn based on positions pos^,... pos^}. pos^,... pos^j of the mobile 0Mi,...,0Mn relatively several optical fibers 111 ..., 1 lj provided by mobile locators relative to separate optical fibers 33i...33j: pos^i^ POS'h PO&iY •Pos^ -f(p°sî}^ ■■■yp0^}-r J \l MŸ ' 1 Ml) r Mn J \* Mn' 1 Mn)

[0164] In a first variant, the geographic locator 34 comprises a triangulation 341 of positions pos^ ... ..., pOS^J^... pOS^n of the mobile 0M[ ..., 0Mn relative to several optical fibers 111 ..., 1 lj provided by locations of the mobile relative to distinct optical fibers 33 b.33j to provide a geographic position Posmi ' ' ' P0SMn of the mobile Mb...,Mn : pos^ = A(pos^, ..., pos^J,}, ..., pos„ = A(pos^} , .... pos^j ) 1 Ml MŸ ' Ml)- ' ' Mn Mn' 1 Mn)

[0165] In a second variant, the geographic locator 34 comprises a triangulation 341 of the acoustic signatures of the mobile 0M i,...,0Mn in acoustic signals detected sal... saj from several optical fibers 111 ..., 1 lj to provide a geographic position P°sm\ ' ' ' P0SMn of the mobile 0Mi, • • • ,0Mn-

[0166] In particular, the geolocation device 3 comprises: - a position recorder 38 (not shown) pos^t... pos^}, ..., pos^j,... pos^J ; pos„ ,... not*, of the mobile Mb ..., Mn determined by the geolocation device 3, in particular the position(s) pos^,... DOS?} . ..., posp1 . pos^j of the mobile 0Mj,... ,0Mn relative to one, or even several, optical fiber(s) 111 ..., 1 lj, and / or the position P°smi P0SMn of the mobile 0Mi,.. .,0Mn.

[0167] In particular, the position(s) of the mobile 0M i,...,0Mn is / are recorded in a storage device, possibly a position storage device 39 (not shown), such as a memory, a database, etc.

[0168] In particular, the geolocation device 3 comprises: - a geographic map analyzer 351 (not shown) capable of determining the position pos™ / ... po^f, ..., pos™?. ... pos™ / of the mobile on a map mp of the geographic area covered by the optical fiber network 1 as a function of the localized position of the mobile P°sm\' ' ' P°SMn, pos^^ ... pos^} , pos^ / ... posFj ■

[0169] In particular, the geolocation device 3 comprises: - a network card analyzer 352 (not shown) capable of determining the position pos^f... pos1”?, .... pos™ / ... pos^f of the mobile on a fiber optic network card containing the optical fiber as a function of the localized position of the mobile P°smi , pos^ ... pos^}. ..., pos^^ ... po^j , and the known position of the fiber 1 Ml r Mn ' 1 Ml r Mn optics P°Spp •••' P°spj.

[0170] In particular, the network card analyzer 352 is capable of retrieving the mp map of the geographical area, on which the pospi... poSpj positions of the optical fibers Fi..., Fj may be indicated. Specifically, the network card analyzer 352 includes a card reader or loader capable of retrieving the mp map. The mp map is, for example, retrieved from a storage device, in particular a card storage device 36, such as a memory or card database.

[0171] In particular, the geolocation device 3 comprises: - a map modifier 35 capable of positioning a representation of the mobile on a map mp according to the localized position of the mobile Posmi ' ' ' P°SMn, DOSPl .. DOSPÏ. ... nos1'^ .. DOSPj , and the known position of at least one fiber ' Ml 1 Un l Ml 1 Mn optical P°sp\ P®spj, the card modifier 35 is capable of providing a card mp* including the representation of the mobile: mp* ( P°SM] ), mP* ( {Pos^„} ) • • •

[0172] In particular, the geolocation device 3 comprises: - a card modifier 35 capable of positioning a representation of the mobile on a card mp according to the determined position of the mobile posTf.... po^f, ..., pos™? ... po^f on a card mp, the card modifier 35 is capable of providing a card mp* comprising the representation of the mobile: I...

[0173] In particular, the geolocation device 3 comprises: - a card reproduction device 353 capable of reproducing the card mp* including the representation of the mobile: mp*{pos^^, mp*^ {Posmh} ) •••

[0174] In particular, the located mobile position transmitter 37 is capable of transmitting a mobile position and / or a map mp* containing the mobile position, possibly via a fiber optic network 5, to one of the following receivers: - a receiver 47 (not shown) of a mobile manager 4; - a 07Mi receiver (not shown) of the mobile located at 0Mb

[0175] Figure 4 illustrates an example of a use case of a geolocation device according to the invention.

[0176] Two mobile units 0Mi and 0M2, respectively a car and an airplane, move within a geographical area covered by a fiber optic network 1, in this case aerial fiber optic cables 1 lb 112,... deployed between support poles 10i and 105, 102 and 104,...

[0177] A locator 33b respectively 332, relative to optical fiber 1 lb respectively! 12, is capable of providing a position of each of the two mobiles 0Mi and 0M2 relative to optical fiber 1 lb respectively! 12: Posf^ Pos^ir respectively P°s^ ​​P°s^j2-

[0178] In particular, the locator 33b 332 relative to an optical fiber includes in particular a return signal receiver 32b 322 capable of providing the return signal srb sr2 from the optical fiber 1 lb 112.

[0179] In particular, the locator 33b 332 relative to an optical fiber includes an acoustic extractor 3311, 3312 capable, in particular, of extracting an acoustic signal sab sa2 from a return signal srb sr2 originating from the optical fiber 1 lb 112, in particular provided by the return signal receiver 32b 322. The extracted acoustic signal sab sa2 is, in particular, a signature s%m\, sSmi of a mobile 0M 1, 0M2-

[0180] In particular, the locator 33b 332 relative to an optical fiber includes a distributed acoustic detector 33lb 3312, also called a distributed acoustic sensor capable of detecting an acoustic signal sab sa2 ^wi, and its position P°sF^ (sai ), po^2 ( ««1 ), ( *gMl ), POSF1 ( sgM2 ), posF^ ( sa2 ), pos^ ( sa2 ), pos^ (Sg, posF2(sgM2) in a return signal from a 1 lb 112 optical fiber.

[0181] In particular, the locator 33b 332 relative to an optical fiber 1 lb 112 includes a recognition device 332b 3322. The recognition device 332b 3322 is in particular capable of recognizing the mobile 0M b 0M2.

[0182] Optionally, prior to the use of the recognition device 332b 3322, a learning of the acoustic signatures s&mi, of the mobiles 0M i, 0M2 is carried out.

[0183] In particular, a learning device 30 is capable of capturing the acoustic signature s^M2 of a mobile 0M b 0M2 and recording it in association with an identifier idMb idM2 and / or a type tyMb tyM2 of the mobile 0Mi, 0M2 in particular in an acoustic base 31, also called a reference database.

[0184] The learning device 30 is in particular an artificial intelligence device capable of analyzing the sound signature of the mobile.

[0185] In this case, the recognition device 332b 3322 consults the acoustic base 31.

[0186] In particular, the recognition device 332b 3322recognizes: - a first acoustic signal salMi corresponding to the acoustic signature sSMi of the mobile 0Mi in the acoustic signal sai detected in the return signal from the optical fiber 111;

[0187] - a second acoustic signal salM 2 corresponding to the acoustic signature SSM2 of the mobile 0M 2 in the acoustic signal sai detected in the return signal from optical fiber 111;

[0188] - a third acoustic signal sa2M[ corresponding to the acoustic signature s&m\ of the mobile 0Mi in the sa2 acoustic signal detected in the return signal from optical fiber 112;

[0189] - a fourth acoustic signal sa2M 2 corresponding to the acoustic signature of the mobile 0M 2 in the acoustic signal sa2 detected in the return signal from optical fiber 112.

[0190] In particular, the locator 33b 332 is able to provide a position P™1^ Posm^ pos^Ÿ pos^ of the mobile relative to an optical fiber as a function of the mobile recognized by the recognition device 332b 3322.

[0191] In particular, the relative positions of the optical fibers Pos^ P°smt pos^f pos^f provided in particular by the locators 33b 332 are used by a geographic locator 34, in particular a triangulation device, capable of determining the geographic positions of the mobiles posMb posM2 as a function of the relative positions of the optical fibers P0^? PosIm\' P°s^>-

[0192] In particular, a transmitter 37 transmits to each of the mobiles 0Mi, respectively 0M2, its geographical position posMb respectively posM2, notably provided by the geographical locator 34.

[0193] Thus, the invention proposes to use the optical fibers of the telecom network to capture the sound and / or vibrations emitted by a mobile device, in particular a vehicle, via a "fiber sensing" device, and / or sound recognition (in particular Artificial Intelligence for sound recognition) and / or a network mapping database. In particular, since the position of the optical fiber cables is known, the location of the mobile device can be deduced in real time.

[0194] In particular, the discrimination of one mobile from another is carried out either by its specific sound signature, or by knowing its starting point, which makes it possible to follow it step by step, or the 2 solutions combined for better robustness of the system.

[0195] In particular, the sound signature can come either from the "natural" noise of its engines in a low-density environment (helicopter, certain types of aircraft), or from a specific signal added individually (acoustic identifier).

[0196] In particular, the geolocation device according to the invention retrieves geolocated sound signals captured by a fiber sensing device. In the case of Distributed Acoustic Sensing, sound recognition, specifically artificial intelligence for sound recognition, makes it possible to link a sound signal to a mobile device based on its signature. The same mobile device can be identified by several Distributed Acoustic Sensing devices on different optical fibers. By correlating the different positions, notably through triangulation, the invention makes it possible to geolocate the mobile device.

[0197] This position can then be used to find out this information in the cloud (e.g., for fleet management) and / or be transmitted by a communication system (e.g., 5G) to the mobile phone which then knows where it is.

[0198] In addition to being resilient to electromagnetic jamming, our invention makes it possible to spatially cover the territory in addition to other known technologies.

[0199] In addition, the invention does not require on-board power to process satellite signals and therefore allows for energy-efficient positioning.

[0200] The invention also relates to a medium. The information medium can be any entity or device capable of storing the program. For example, the medium can include 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 floppy disk or a hard disk drive.

[0201] On the other hand, the information medium can be a transmissible medium such as an electrical or optical signal that can be transmitted via an electrical or optical cable, by radio, or by other means. The program according to the invention can, in particular, be downloaded onto a network, especially an Internet-type network.

[0202] Alternatively, the information carrier may 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 process in question.

[0203] In another implementation, the invention is implemented by means of software and / or hardware components. In this context, the term module can refer to either a software component or a hardware component. A software component corresponds to one or more computer programs, one or more subroutines of a program, or more generally to any element of a program or software capable of implementing a function or a set of functions as described above. A hardware component corresponds to any element of a hardware assembly capable of implementing a function or a set of functions.

Claims

Demands

1. A method for geolocating a mobile comprising: - locating relative to an optical fiber of an optical fiber network a position of the mobile based on an acoustic signal detected in a return signal at one end of the optical fiber, the acoustic signal having an acoustic signature of the mobile.

2. A method for geolocating a mobile according to the preceding claim, wherein the geolocation method comprises: - recognizing the mobile based on the acoustic signature of the mobile in the detected distributed acoustic signal.

3. A method for geolocating a mobile according to any one of the preceding claims, wherein the geolocation method comprises: - discriminating the mobile against another mobile based on the acoustic signature of the mobile distinct from another acoustic signature of the other mobile.

4. A method for geolocating a mobile device according to one of claims 1 or 2, wherein the geolocation method comprises: - discriminating the mobile device from another mobile device based on a last localized position of the mobile device.

5. A method for geolocating a mobile according to the preceding claim, wherein the discrimination of the mobile from another mobile comprises: - tracking the mobile from a starting point known to the mobile.

6. A method for geolocating a mobile according to any one of the preceding claims, wherein the geolocation method comprises: - determining the position of the mobile on a map of the optical fiber network comprising the optical fiber as a function of the localized position of the mobile relative to the optical fiber and the known position of the optical fiber.

7. A method for geolocating a mobile device according to any one of the preceding claims, wherein the geolocation method comprises: - locating the mobile device within a geographical area covered by a set of optical fibers of the optical fiber network based on localized positions of the mobile device relative to several optical fibers from this set of optical fibers covering the geographical area.

8. A method for geolocating a mobile according to the preceding claim, wherein the localization of the mobile in a geographical area comprises: - triangulating the position of the mobile in the geographical area as a function of localized positions of the mobile relative to several optical fibers of this set of optical fibers covering the geographical area.

9. A method for geolocating a mobile according to any one of the preceding claims, wherein the geolocation method comprises: - recording the position of the mobile determined by the geolocation method.

10. A method for geolocating a mobile according to one of the preceding claims, wherein the acoustic signature of a mobile is an acoustic signal among the following: - an acoustic signal emitted by the mobile during movement, - an acoustic identifier specific to the mobile.

11. A program comprising program code instructions for executing the steps of the geolocation method according to any one of the preceding claims when said program is executed by a processor.

12. A mobile geolocation device comprising: - a mobile locator relative to an optical fiber of an optical fiber network capable of providing a position of the mobile based on an acoustic signal detected in a return signal at one end of the optical fiber, the acoustic signal having an acoustic signature of the mobile.

13. A geolocation device for a mobile device according to the preceding claim, wherein the geolocation device comprises one or more of the following devices: - a return signal analyzer capable of analyzing a return signal corresponding to the reflection of a probing signal by the optical fiber of the optical fiber network, the probing signal having been emitted on the optical fiber; - an acoustic extractor capable of extracting an acoustic signal from the return signal;

14.

15. - a sound recognition device capable of recognizing an acoustic signal included in the return signal; - a mapping database of the optical fiber network including optical fiber. A mobile geolocation device according to the preceding claim, wherein the sound recognition device is an artificial intelligence device. A geolocation device for a mobile device according to any one of claims 12 to 14, wherein the geolocation device comprises a transmitter of the location of the mobile device to a receiver among the following: - a receiver from a mobile phone manager; - a localized mobile receiver.

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