DETECTION METHOD AND DETECTION SYSTEM FOR A DEVICE EMITTING ELECTROMAGNETIC WAVES

Abstract

The present invention relates to a method for detecting in an aircraft (1) a device (10) emitting electromagnetic waves in a predetermined frequency band, the aircraft (1) comprising at least one electromagnetic wave sensor, capable of measuring electromagnetic waves emitted by the device (10) emitting electromagnetic waves in the predetermined frequency band, the detection method comprising at least: a measurement obtaining step (E600), consisting of obtaining at least one measurement of a signal received by the electromagnetic wave sensor; a control step (E603), consisting of verifying whether the measurement obtained is greater than a predetermined threshold; a sensor identification step, consisting of identifying the electromagnetic wave sensor having provided the measurement greater than the predetermined threshold;an area identification step (E609), consisting of identifying at least one area in which the electromagnetic wave sensor having provided the measurement greater than the predetermined threshold is located; and a notification step (E610), consisting of generating at least one item of information and / or a signal indicating the area in which the electromagnetic wave sensor having provided the measurement greater than the predetermined threshold is located. Figure for the abstract: Fig. 6;

Description

Title of the invention: METHOD FOR DETECTING AND SYSTEM FOR DETECTING A DEVICE EMITTING ELECTROMAGNETIC WAVES Technical field

[0001] The present invention relates to a method for detecting and a system for detecting a device emitting electromagnetic waves in a frequency band, such as telecommunications equipment. STATE OF PRIOR ART

[0002] The deployment of new mobile telephone networks, such as 5G (fifth generation), poses problems of interference with systems on board aircraft.

[0003] Such interference problems are particularly present in the 3.7-3.98 GHz band which has been authorized for 5G. Such a frequency band is close to that used in radio altimeters operating in a frequency band between 4.2 and 4.4 GHz.

[0004] The authorities have issued information bulletins to aircraft manufacturers and air operators reporting such interference problems (Service Information Bulletin EASA 2021-16 of December 17, 2021 and Special Airworthiness Information Bulletin FAA “AIR-21-18” of November 2, 2021).

[0005] Today, an aircraft cabin crew member asks passengers to turn off their mobile telecommunications equipment or switch it to "airplane" mode. Apart from a visual check of the telecommunications equipment of passengers present in the aircraft, there is no effective solution for verifying the correct application of such instructions.

[0006] The present invention makes it possible to provide cabin crew with a detection system making it possible to check simply and quickly that all the devices emitting electromagnetic waves of passengers present in an aircraft are switched off, switched to an "airplane" mode or do not emit electromagnetic waves in a predetermined frequency band. Statement of the invention

[0007] To this end, according to a first aspect, an embodiment proposes a method for detecting, in an aircraft, a device emitting electromagnetic waves in a predetermined frequency band. To this end, the aircraft comprises at least one electromagnetic wave sensor, capable of measuring electromagnetic waves emitted by the device emitting electromagnetic waves in the predetermined frequency band.

[0008] More specifically, the detection method comprises at least:

[0009] a step of obtaining measurements, consisting of obtaining at least one measurement of a signal received by the electromagnetic wave sensor; - a control step, consisting of checking whether the measurement obtained is greater than a predetermined threshold; - a sensor identification step, consisting of identifying the electromagnetic wave sensor having provided the measurement which is greater than the predetermined threshold; - a zone identification step, consisting of identifying at least one zone in which the electromagnetic wave sensor having provided the measurement greater than the predetermined threshold is located; and - a notification step, consisting of generating at least one piece of information and / or a signal indicating the identified area.

[0010] According to the invention, the step of obtaining measurements, the step of controlling, the step of identifying the sensor, the step of identifying the zone and the step of notifying are executed by a controller device.

[0011] The device emitting electromagnetic waves in a predetermined frequency band may be telecommunications equipment.

[0012] Furthermore, according to the invention, the information and / or the signal indicating the identified zone generated in the notification step is intended for the cabin crew of the aircraft.

[0013] The invention thus makes it possible to reliably detect the presence of devices emitting electromagnetic waves, held by passengers present in the aircraft, which are not switched off or switched to an “airplane” mode and to notify the cabin crew of a precise location of such devices emitting electromagnetic waves.

[0014] Furthermore, the detection method according to the invention may comprise one or more of the following steps taken individually or in combination, according to which: - at least one comparison step, carried out prior to the control step, consisting of comparing the measurement in at least one frequency sub-band with at least one threshold corresponding to the frequency sub-band; - at least one selection step, consisting of selecting at least one measurement from a first electromagnetic wave sensor, prior to the comparison step and / or the control step; - a storage step consisting of storing an identifier of the selected electromagnetic wave sensor, if, during the control step, the measurement obtained is greater than the predetermined threshold; - a processing verification step consisting of verifying whether measurements received from another electromagnetic wave sensor have not been processed, if, during the control step, the measurement obtained is lower than the predetermined threshold or following the storage step; - a new selection step of selecting another electromagnetic wave sensor and returning to the comparison step, if, during the processing verification step, it has been determined that measurements received from another electromagnetic wave sensor have not been processed; - a storage verification step consisting of verifying whether at least one identifier of the electromagnetic wave sensor has been stored, if, during the processing verification step, it has been determined that measurements received from another electromagnetic wave sensor have been processed; - a generation step of generating information and / or a signal indicating that no electromagnetic wave in a predetermined frequency band has been detected, if, during the storage verification step, it has been determined that no identifier of the electromagnetic wave sensor has been stored; and / or - if, during the storage verification step, it was determined that at least one identifier of the electromagnetic wave sensor was stored, proceed to the identification step.

[0015] The detection method according to the invention is particularly suitable for a frequency band between 900 MHz and 4.4 GHz.

[0016] However, the detection method according to the invention is likely to be applied within the framework of the application of the EUROCAE ED-14G standard “Environmental conditions and test procedures for airborne equipment”, which defines a series of test environments and test procedures for equipment on board the aircraft. It is recalled that the EUROCAE ED-14G standard is technically identical to the RTCA DO-160G Change 1 standard.

[0017] In particular, the detection method according to the invention finds a particular application of the radiofrequency emission tests detailed in section 21 “Emission of Radio Frequency Energy” of the latter and of the associated frequency ranges.

[0018] The EUROCAE ED-14G / RTCA DO-160G standard sets out compliance with test procedures and environmental conditions that may be required for aircraft in Europe and the United States.

[0019] Furthermore, according to the invention, the predetermined frequency band is divided into a plurality of frequency sub-bands and each frequency sub-band corresponds to a predetermined threshold.

[0020] An embodiment also relates to a system for detecting in an aircraft a device emitting electromagnetic waves in a predetermined frequency band. For this purpose, the system comprises at least one electromagnetic wave sensor, capable of measuring electromagnetic waves emitted by the device emitting electromagnetic waves in the predetermined frequency band.

[0021] More specifically, the system comprises: - means for obtaining measurements, capable of receiving at least one measurement of a signal received by the electromagnetic wave sensor, - control means, capable of verifying whether the measurement obtained is greater than a predetermined threshold, - sensor identification means, capable of identifying the electromagnetic wave sensor having provided the measurement which is greater than the predetermined threshold, - zone identification means, capable of identifying at least one zone in which the electromagnetic wave sensor having provided the measurement above the predetermined threshold is located, and - notification means, capable of generating at least one piece of information and / or a signal indicating the area in which the electromagnetic wave sensor that provided the measurement above the predetermined threshold is located.

[0022] Thus, the present invention makes it possible to provide the cabin crew with a detection system making it possible to check simply and quickly that all the devices emitting electromagnetic waves from passengers present in an aircraft are switched off, switched to an “airplane” mode or are not emitting electromagnetic waves in the predetermined frequency band.

[0023] Furthermore, the detection system may comprise at least one controller device comprising the means for obtaining measurements, the control means, the identification means, the identification means and the notification means.

[0024] According to a particular embodiment, the frequency band is between 900 MHz and 4.4 GHz.

[0025] According to a particular embodiment, the electromagnetic wave sensor is positioned in a headrest of a seat, in an arranged in-flight entertainment system and / or in a passenger service unit.

[0026] Thus, such placement of the electromagnetic wave sensor makes it possible to cover an area comprising the seat tray placed behind the seat and the seat placed behind the seat.

[0027] According to a particular embodiment, the electromagnetic wave sensor is positioned in the hold of the aircraft.

[0028] Thus, the present invention makes it possible to detect whether devices emitting electromagnetic waves have been placed in passengers' luggage.

[0029] According to a particular embodiment, the electromagnetic wave sensor is arranged on at least one electronic equipment of the aircraft.

[0030] Thus, it is possible to check that the electronic equipment of the aircraft likely to be sensitive to electromagnetic waves is not subjected to electromagnetic waves emitted by a device emitting electromagnetic waves.

[0031] According to a particular embodiment, the electromagnetic wave sensor comprises at least one directional antenna, capable of receiving electromagnetic waves emitted by the device emitting electromagnetic waves in the predetermined frequency band, in particular present in an area in which at least one seat is arranged.

[0032] Thus, the present invention makes it possible to provide the cabin crew with a precise zone in which the device emitting electromagnetic waves in the predetermined frequency band is located.

[0033] According to a particular embodiment, the predetermined frequency band is divided into a plurality of frequency sub-bands and each frequency sub-band corresponds to a predetermined threshold.

[0034] According to a particular embodiment, the electromagnetic wave sensor comprises a bandpass filter whose bandwidth is modified as a function of the frequency sub-band.

[0035] A particular embodiment also relates to a computer program product. It comprises instructions for implementing the detection method according to one of the preceding embodiments, when the program is executed by a processor.

[0036] A particular embodiment also relates to a storage medium, capable of storing a computer program comprising instructions for implementing the detection method according to one of the preceding embodiments, when the program is executed by a processor. Brief description of the drawings

[0037] The above-mentioned and other features of the invention will become more apparent from the following description of an example of embodiment given for illustrative purposes with reference to the appended figures, in which: - [Fig.la] schematically illustrates an example of an aircraft cabin in which the present invention is implemented; - [Fig.lb] schematically illustrates an example of a hold of an aircraft in which the present invention is implemented; - [Fig.2] schematically illustrates an example of a configuration of electromagnetic wave sensors in a part of the cabin of an aircraft according to the present invention; - [Fig.3] schematically illustrates an architecture of a controller device according to one embodiment of the present invention; - [Fig.4] illustrates maximum levels of electromagnetic radiation in a frequency band permitted in an aircraft; - [Fig.5] schematically illustrates an example of sensor architecture according to the present invention; and - [Fig.6] illustrates an example of a detection process performed by a controller device according to one embodiment of the present invention.

[0038] DETAILED DESCRIPTION OF EMBODIMENTS

[0039] [Fig.1a] schematically illustrates an example of a cabin 2 of an aircraft 1 in which the present invention is implemented.

[0040] The cabin 2 of the aircraft 1 comprises in particular a plurality of seats, referenced PAi to Pan, PFi to PFN in [Fig. 1a], intended to receive passengers. The cabin 2 of the aircraft 1 also comprises a controller device 4, configured to implement the present invention.

[0041] According to one embodiment of the invention, at least some of the seats in the cabin 2 comprise an electromagnetic wave sensor, not shown in [Fig.1a]. For example, each seat in the cabin 2 comprises an electromagnetic wave sensor. Alternatively, every other seat in the same row of seats in the cabin 2 comprises an electromagnetic wave sensor.

[0042] The controller device 4 includes in particular notification means, in particular intended for at least one flight crew member, such as a cabin crew member, also designated by the acronym “PNC”. The flight crew member is likely to receive information, via the notification means, of the result of processing carried out by the controller device 4 on data received from the electromagnetic wave sensors.

[0043] [Fig.lb] schematically illustrates an example of a hold 6 of an aircraft 1 in which the present invention is implemented.

[0044] The hold 6 of the aircraft 1 comprises in particular a plurality of locations, referenced Ct[ to CtM in [Fig.lb], intended to receive goods. The hold 6, or possibly another part of the aircraft 1, comprises at least one electronic equipment 8.

[0045] According to one embodiment of the invention, at least some of the locations of the hold 6 comprise an electromagnetic wave sensor, not shown in [Fig.lb]. For example, each location of the hold 6 comprises an electromagnetic wave sensor.

[0046] According to one embodiment of the invention, at least a portion of the electronic equipment 8 comprises an electromagnetic wave sensor. According to one embodiment, each electronic equipment 8 comprises an electromagnetic wave sensor not shown in [Fig.lb]. For example, each electronic equipment 8 comprises an electromagnetic wave sensor.

[0047] The electronic equipment 8 is, for example, electronic control units, also designated by the acronym “ECU” for “Electronic Control Unit” in English, a radio altimeter, etc.

[0048] According to one embodiment of the invention, each electromagnetic wave sensor is connected respectively to the controller device 4, represented in [Fig.1a], by a wired link or a radio link.

[0049] [Fig.2] schematically illustrates an example of a configuration of electromagnetic wave sensors in a part of the cabin of an aircraft according to the present invention.

[0050] In the example presented in [Fig.2], six seats PAi, PBi, Pci, Paî+i, Pbî+1, Pci+i, where i=1 to Nl are represented.

[0051] According to the invention, a detection system makes it possible to detect a device emitting electromagnetic waves in a predetermined frequency band and present in the aircraft 1. More particularly, the detection system comprises at least one electromagnetic wave sensor, capable of measuring electromagnetic waves emitted by the device emitting electromagnetic waves in a predetermined frequency band.

[0052] For this purpose, the detection system comprises at least: - means for obtaining measurements, capable of receiving at least one measurement of a signal received by the electromagnetic wave sensors, - control means, capable of verifying whether the measurement obtained is greater than a predetermined threshold, - sensor identification means, capable of identifying the electromagnetic wave sensor having provided the measurement above the predetermined threshold, - zone identification means, capable of identifying at least one zone in which the electromagnetic wave sensor having provided the measurement above the predetermined threshold is located, and - notification means, capable of generating at least one item of information and / or a signal, in particular for the cabin crew of the aircraft, indicating the zone in which the electromagnetic wave sensor is located which provided the measurement greater than the predetermined threshold.

[0053] According to a particular embodiment, the controller device 4 comprises the means for obtaining measurements, the control means, the identification means, the identification means and the notification means.

[0054] According to one embodiment of the invention, each seat PAi, PBi, PCi, Paî+u Pai+n Pci +i respectively comprises an electromagnetic wave sensor CAi, CBi, CCi, CAi+i, CBi+i and Cci+i, where i=1 to N-1.

[0055] According to a particular embodiment of the invention, the electromagnetic wave sensor can be placed in a headrest of the seat and / or in an in-flight entertainment system, also designated by the acronym “IFE” for “In-Flight Entertainment” in English.

[0056] The sensitivity of the electromagnetic wave sensor is, in the example of [Fig.2], reduced to the volume taken up by two places likely to be occupied by two passengers. Alternatively, the sensitivity of the electromagnetic wave sensor is reduced to the distance taken up by a place likely to be occupied by a passenger.

[0057] Thanks to such an arrangement, a location of the sources of emission of electromagnetic waves in a given frequency band will be done by a location of the electromagnetic wave sensors detecting emissions of electromagnetic waves.

[0058] According to another embodiment, the electromagnetic wave sensors will be placed above the passengers, in particular in a passenger service unit, also designated by the acronym “PSU” for “Passenger Service Unit”, in particular passenger service units.

[0059] The passenger service unit may be arranged above the passenger and oriented towards the passenger.

[0060] The electromagnetic wave sensors CAi, CBi, Ca, CAi+i, CBi+i and CCi+i comprise at least one directional antenna, capable of receiving electromagnetic waves.

[0061] The electromagnetic wave sensor CAi may have a directivity cone referenced DAisur la [Fig.2]. Similarly, the electromagnetic wave sensor CBi may have a directivity cone referenced DBi and the electromagnetic wave sensor CCi may have a directivity cone referenced Da.

[0062] Passengers, referenced IAi, IBi, la, IAi+i, Ibî+i, la+i in [Fig.2], are seated respectively in the seats PAi, PBi, Pci, Paî+i, Pbî+i, Pci+i-

[0063] In the example of [Fig.2], the passenger IBi+idi has equipment of telecommunication 10, which is not turned off or switched to “airplane” mode.

[0064] In such a configuration, the device emitting electromagnetic waves 10 emits or is capable of emitting electromagnetic waves in a given frequency band.

[0065] The “airplane” mode makes it possible to prohibit any sending and / or reception of electromagnetic waves by the device emitting electromagnetic waves 10 without it being switched off.

[0066] An example of a radiation diagram 12 of the device emitting electromagnetic waves 10 is shown in [Fig.2].

[0067] In the example of [Fig.2], the electromagnetic wave sensors CAi, CBi, Ca detect the electromagnetic waves emitted by the electromagnetic wave emitting device 10.

[0068] [Fig.3] schematically illustrates an architecture of a controller device according to an embodiment of the present invention.

[0069] According to the example of hardware architecture represented in [Fig.3], the controller device 4 comprises, connected by a communication bus 300: - at least one processor 301, also designated by the acronym “CPU” for “Central Processing Unit” in English; - at least one RAM 302, in particular a RAM for “Random Access Memory” in English; - at least one read-only memory 303, in particular a ROM read-only memory for “Read Only Memory” in English; - at least one storage unit 304, such as a hard disk, or a storage media reader, such as an SD card reader for “Secure Digital” in English; and - at least one communication interface 305, capable of allowing the controller device 4 to communicate at least with the electromagnetic wave sensors.

[0070] The controller device 4 may possibly have a human-machine interface, capable of receiving commands from the cabin crew to execute an algorithm, such as the algorithm which will be described with reference to [Fig. 6], and / or to notify the cabin crew of the result of the processing carried out by the controller device 4 on the data received from the electromagnetic wave sensors.

[0071] It should be noted here that the controller device 4 can be controlled via the communication interface 305 and can transfer the result of the processing carried out by the controller device 4 on the data received from the electromagnetic wave sensors to a remote device accessible to the cabin crew.

[0072] The processor 301 is capable of executing instructions loaded into the RAM 302 from: - from read-only memory 303, - an external memory (not shown), - a storage medium, such as an SD card, and / or - a communications network.

[0073] When the controller device 4 is powered up, the processor 301 is capable of reading instructions from the RAM 302 and executing them. Such instructions form a computer program causing the processor 301 to implement all or part of the detection method described in relation to [Fig.6].

[0074] The detection method according to the present invention can be implemented: - in software form by executing a set of instructions by • a programmable machine, for example a digital signal processor, also designated by the acronym “DSP” for “Digital Signal Processor” in English, a microcontroller,

[0075] and / or - in hardware form by a machine or a dedicated component, for example a programmable logic circuit, also designated by the acronym "FPGA" for "Field-Programmable Gate Array" in English, or an integrated circuit specific to an application also designated by the acronym "ASIC" for "Application-Specific Integrated Circuit" in English.

[0076] In general, a controller device 4 comprises electronic circuitry configured to implement the detection methods according to the present invention.

[0077] [Fig.4] illustrates maximum levels of electromagnetic radiation in a frequency band permitted in the aircraft 1.

[0078] On the abscissa axis, frequencies expressed in MHz are represented and on the ordinate axis, levels of a strength of a received electromagnetic signal are represented, also designated by the acronym “RSSI” for “Received Signal Strength Indicator” or “Received Signal Strength Indication” in English, expressed in dBpV.

[0079] The curve referenced Max represents the maximum admissible levels as a function of frequency.

[0080] The electromagnetic wave sensors CAi, CBi, Ca, CAi+i, CBi+i and CCi+i are capable of measuring the levels of the strength of the electromagnetic signal received in the entire frequency band represented in [Fig.4].

[0081] In a particular embodiment of the invention, only the frequency band between 900 MHz and 4.4 GHz is processed by the electromagnetic wave sensors. Such a frequency range corresponds to the frequency range used by mobile telephones, radio altimeters, and to the frequencies allocated to the aeronautical radionavigation service and aeronautical mobile services, also designated by the acronym "WAIC" for "Wireless Avionics Intra-Communications" in English.

[0082] [Fig.4] includes a hatched area 400 corresponding to an area in which the measurements will be representative of the detection of a device emitting electromagnetic waves 10 which is not turned off or switched to “airplane” mode.

[0083] In the example of [Fig.4], the hatched area 400 is subdivided into several frequency sub-bands. Each frequency sub-band is associated with a threshold.

[0084] In the example presented in [Fig.4], six frequency sub-bands make up the zone 400. Each frequency sub-band is respectively associated with a threshold, referenced S1, S2, S3, S4, S5, S6 and S7 in [Fig.4],

[0085] According to the example presented: - a first SI threshold is 60 dBuV / m maximum, for any detected emission included in a frequency range between 900 MHz and 960 MHz; - a second threshold S2 is 47 dBuV / m maximum, for any detected emission included in a frequency range between 960 MHz and 1.215 GHz; - a third threshold S3 is 63 dBuV / m maximum, for any detected emission included in a frequency range between 1.125 GHz and 1.525 GHz; - a fourth threshold S4 is 49.2 dBuV / m maximum, for any detected emission included in a frequency range between 1.525 GHz and 1.680 GHz; - a fifth threshold S5 is 67dBuV / m maximum, for any detected emission included in a frequency range between 1.680GHz and 2.4Ghz; - a sixth threshold S6 is 68 dBuV / m maximum, for any detected emission included in a frequency range between 2.4 GHz and 3 GHz; and - a seventh threshold S7 is 71 dBuV / m maximum, for any detected emission included in a frequency range between 3GHz and 4.4Ghz.

[0086] Alternatively, the hatched area 400 may be reduced to a portion of the frequency sub-bands, or even a single frequency sub-band.

[0087] [Fig.5] schematically illustrates an example of architecture of an electromagnetic wave sensor according to the present invention.

[0088] Each electromagnetic wave sensor CAi, CBi, CCi, CAi+i, CBi+i and CCi+i may comprise: - a 501 directional antenna, in particular fixed on a ground plane, - possibly a 502 low noise amplifier, depending on the characteristics of the antenna used, - an adjustable bandpass filter 503, capable of allowing selection of a given frequency sub-band, - possibly a signal attenuator 504, depending on the characteristics of the antenna used, - an analog-digital converter 505, capable of enabling an indicator of the strength of the received signal RSSI to be obtained, in particular in digital form, and - a wired or wireless means of communication 506.

[0089] [Fig.6] illustrates an example of the detection method executed by the controller device 4 according to one embodiment.

[0090] The detection method comprises at least one step of obtaining measurements E600, consisting of obtaining at least one measurement of a signal received by at least one electromagnetic wave sensor, in particular measurements of the signals received by the electromagnetic wave sensors CAi, CBi, Ca, CAi+i, CBi+i and CCi+i, in particular by the controller device 4.

[0091] According to one embodiment of the invention, at least one electromagnetic wave sensor, in particular each electromagnetic wave sensor, sends a measurement for each frequency sub-band corresponding to a threshold as shown in [Fig.4].

[0092] For this purpose, the detection method may comprise at least one selection step E601, consisting of selecting, in particular by the controller device 4, at least one measurement of a first electromagnetic wave sensor from among the electromagnetic wave sensors CAi, CBi, Cci, CAi+j, CBi+j and Cci+i.

[0093] In addition, the detection method may also comprise at least one comparison step E602, consisting of comparing, in particular by the controller device 4, the measurement in at least one frequency sub-band, in particular in each frequency sub-band, with at least one threshold, in particular thresholds SI to S7, corresponding to the frequency sub-band.

[0094] The detection method comprises at least one control step E603, consisting of verifying, in particular by the controller device 4, whether at least one measurement obtained is greater than the threshold corresponding to the frequency sub-band.

[0095] Subsequently, the detection method also comprises at least one sensor identification step consisting of identifying, in particular by the controller device 4, each electromagnetic wave sensor having provided at least one measurement greater than the predetermined threshold.

[0096] More specifically, if the control step E603 is affirmative, the detection method provides, in particular by the controller device 4, to move on to a storage step E604. If the control step E603 is negative, the detection method provides, in particular by the controller device 4, to move on to a verification step E605.

[0097] More particularly, the storage step E604 consists of storing, in particular by the controller device 4, an identifier of the selected electromagnetic wave sensor and moving on to the processing verification step E605.

[0098] The processing verification step E605 consists of verifying, in particular by the controller device 4, whether the measurements received from another electromagnetic wave sensor have not been processed. If so, the detection method provides, in particular by the controller device 4, to move on to a new selection step E606. If not, the detection method provides, in particular by the controller device 4, to move on to a storage verification step E607.

[0099] The selection step E606 consists of selecting, in particular by the controller device 4, another electromagnetic wave sensor and returning to the comparison step E602.

[0100] The storage verification step E607 consists of verifying, in particular by the controller device 4, whether at least one identifier of the electromagnetic wave sensor has been stored. If so, the detection method provides, in particular by the controller device 4, to move on to a zone identification step E609. If not, the detection method provides, in particular by the controller device 4, to move on to a generation step E608.

[0101] The generation step E608 consists of generating, in particular by the controller device 4, information and / or a signal indicating that no electromagnetic wave in a predetermined frequency band has been detected, i.e. that all the telecommunications equipment is switched off or switched to “airplane” mode.

[0102] The zone identification step E609 consists of identifying, in particular by the controller device 4, at least one zone in which the measurement provided by the electromagnetic wave sensor is greater than the threshold.

[0103] For example, according to the example presented in [Fig.2], the measurements provided by the electromagnetic wave sensors CAi, CBi, CCi are greater than the threshold. The controller device 4, knowing a position of each electromagnetic wave sensor in the aircraft 1, determines the presence of the device emitting electromagnetic waves 10 at the seat PBi+i.

[0104] Furthermore, the detection method comprises at least one notification step E610 consisting of generating, in particular by the controller device 4, at least one piece of information or signal indicating the zone in which the measurement provided by the electromagnetic wave sensor is greater than the predetermined threshold. This makes it possible to signal, in particular to the cabin crew of the aircraft, that there is a device emitting electromagnetic waves 10 which is not switched off or switched to “airplane” mode at seat PBi+1.

[0105] Obviously, the invention is not limited to the embodiments described above and provided solely by way of example. It encompasses various modifications, alternative forms and other variants that may be envisaged by those skilled in the art within the framework of the present invention, and in particular all combinations of the different operating modes described above, which may be taken separately or in association.

Claims

1. Claims Method for detecting in an aircraft (1) a device (10) emitting electromagnetic waves in a predetermined frequency band, the aircraft comprising at least one electromagnetic wave sensor, capable of measuring electromagnetic waves emitted by the device (10) emitting electromagnetic waves in the predetermined frequency band, characterized in that it comprises at least: - a step of obtaining measurements (E600), consisting of obtaining at least one measurement of a signal received by the electromagnetic wave sensor, the electromagnetic wave sensor is positioned in a headrest of a seat, in an in-flight entertainment system, in a passenger service unit and / or in a hold of the aircraft (1); - a selection step (E601), consisting of selecting at least one measurement from a first electromagnetic wave sensor; - a control step (E603), consisting of checking whether the measurement obtained is greater than a predetermined threshold; - a storage step (E604) consisting of storing an identifier of the selected electromagnetic wave sensor if, during the control step (E603), the measurement obtained is greater than the predetermined threshold; - a processing verification step (E605) consisting of verifying whether measurements received from another electromagnetic wave sensor have not been processed, if, during the control step (E603), the measurement obtained is lower than the predetermined threshold or following the storage step (E604); - a new selection step (E606) consisting of selecting another electromagnetic wave sensor and returning to the comparison step (E602), if, during the processing verification step (E605), it has been determined that measurements received from another electromagnetic wave sensor have not been processed, and / or - a storage verification step (E607) consisting of verifying whether at least one identifier of the electromagnetic wave sensor has been stored, if, during the processing verification step (E605), it has been determined that measurements received from another electromagnetic wave sensor have been processed; - a generation step (E608) consisting of generating information and / or a signal indicating that no electromagnetic wave in a predetermined frequency band has been detected, if, during the storage verification step (E607), it has been determined that no identifier of the electromagnetic wave sensor has been stored, and / or if, during the storage verification step (E607), it has been determined that at least one identifier of the electromagnetic wave sensor has been stored, proceeding to an identification step (E609); - a sensor identification step, consisting of identifying the electromagnetic wave sensor having provided the measurement greater than the predetermined threshold; - a zone identification step (E609), consisting of identifying at least one zone in which the electromagnetic wave sensor is located having provided the measurement greater than the predetermined threshold;and - a notification step (E610), consisting of generating at least one item of information and / or a signal indicating the area in which the electromagnetic wave sensor having provided the measurement greater than the predetermined threshold is located.;

2. Detection method according to claim 1, characterized in that it comprises at least one comparison step (E602), carried out prior to the control step (E603), consisting of comparing the measurement in at least one frequency sub-band with at least one threshold corresponding to the frequency sub-band.

3. Detection method according to any one of the preceding claims, characterized in that the frequency band is between 900 MHz and 4.4 GHz.

4. Detection method according to any one of the preceding claims, characterized in that the predetermined frequency band is divided into a plurality of frequency sub-bands and in that each frequency sub-band corresponds to a predetermined threshold.

5. System for detecting in an aircraft (1) a device (10) emitting electromagnetic waves in a predetermined frequency band, the detection system comprising at least one electromagnetic wave sensor, capable of measuring waves electromagnetic waves emitted by the device (10) emitting electromagnetic waves in the predetermined frequency band, characterized in that it comprises at least: - means for obtaining measurements, capable of receiving at least one measurement of a signal received by the electromagnetic wave sensor, the electromagnetic wave sensor being positioned in a headrest of a seat, in an in-flight entertainment system, in a passenger service unit and / or in a hold of the aircraft (1), - control means, capable of verifying whether the measurement obtained is greater than a predetermined threshold, - sensor identification means, capable of identifying the electromagnetic wave sensor having provided the measurement greater than the predetermined threshold, - zone identification means, capable of identifying at least one zone in which the electromagnetic wave sensor having provided the measurement greater than the predetermined threshold is located, and - notification means,capable of generating at least one piece of information and / or a signal indicating the area in which the electromagnetic wave sensor is located which provided the measurement above the predetermined threshold, The system comprising at least one controller device comprising the means for obtaining measurements, the control means, the identification means, and the notification means.,

6. Detection system according to claim 5, characterized in that the electromagnetic wave sensor is arranged on at least one electronic equipment of the aircraft (1).

7. Detection system according to claim 5, characterized in that the electromagnetic wave sensor comprises at least one directional antenna capable of receiving electromagnetic waves emitted by the device (10) emitting electromagnetic waves in a predetermined frequency band.

8. Detection system according to claim 6, characterized in that the directional antenna is capable of receiving electromagnetic waves emitted in an area in which at least one seat is arranged.

9. Detection system according to any one of claims 5 to 7, characterized in that the predetermined frequency band is

10. divided into a plurality of frequency sub-bands and in that each frequency sub-band corresponds to a predetermined threshold. Detection system according to claim 9, characterized in that the electromagnetic wave sensor comprises a band-pass filter whose bandwidth is modified according to the frequency sub-band.

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