Classifications

• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
  • G01S3/00—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
  • G01S3/78—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using electromagnetic waves other than radio waves
  • G01S3/782—Systems for determining direction or deviation from predetermined direction
  • G01S3/783—Systems for determining direction or deviation from predetermined direction using amplitude comparison of signals derived from static detectors or detector systems
  • G01S3/784—Systems for determining direction or deviation from predetermined direction using amplitude comparison of signals derived from static detectors or detector systems using a mosaic of detectors
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
  • G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
  • G01S1/70—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using electromagnetic waves other than radio waves
  • G01S1/703—Details
  • G01S1/7032—Transmitters
  • G01S1/7038—Signal details
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
  • G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
  • G01S5/16—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using electromagnetic waves other than radio waves

Definitions

• the invention relates to a geolocation device comprising a photodetector adapted to detect a Li-Fi signal and processing means using the Li-Fi signal to provide a position of the geolocation device.
• Li-Fi for "Light Fidelity"
• availability of the optical spectrum no Electromagnetic Interference ⁇ ticks, cost, etc.
• the Li-Fi technology is therefore perfectly suited to transmit and receive music, videos, internet data, measurement data (temperature, brightness, etc.), alarms (fire, presence of toxic vapors, etc.). .), to connect network cap ⁇ tors or other types of devices, etc.
• the object of the invention is to determine the position of a mobile electronic device capable of communicating via Li-Fi.
• a geolocation device comprising:
• detection means comprising a photodetector and adapted to detect a Li-Fi signal from an external light emitting source
• processing means adapted to produce location parameters from the detected L1-Fi signal, and to provide a relative position of the location device with respect to the external light source from the location parameters.
• the relative position of the geolocation device is obtained from the Li-Fi signal coming from the external light emitting source. relative to said source.
• FIG. 1 shows a network of electronic devices communicating with each other via Li-Fi, one of the apparatuses being a mobile telephone equipped with the geolocation device according to a first embodiment. of the invention
• FIG. 2 shows the mobile phone equipped with the geolocation device according to the first embodiment of the invention
• FIG. 3 represents detection means of the geolocation device according to the first embodiment of the invention
• FIGS. 4a to 4c represent radiances detected by the detection means of the geolocation device according to the first embodiment of the invention
• Figure 5 shows the horizontally positioned mobile phone as well as LED lamps emitting a Li-Fi signal used by the geolocation device to determine the position of the mobile phone;
• FIG. 6 is a figure similar to that of Figure 5 wherein the mobile phone is oriented at a yaw angle, a roll angle and a pitch angle;
• FIG. 7 represents a diagram schematizing the operation of the geolocation device according to a second embodiment of the invention
• the geolocation device 1 according to a first embodiment 1 of the invention here team an electronic apparatus Suspected ⁇ tible to communicate li-fi, in this case a mobile telephone 2 provided with means for Li-Fi communication.
• the mobile phone 2 is itself integrated in a network located in a room of a workspace and comprising a plurality of interconnected electronic devices communicating with each other via Li-Fi.
• the network comprises, in addition to the mobile telephone 2, LED lamps 3a, 3b, 3c, 3d fixed to the ceiling of the room, a computer 4a, a server 4b, a printer 5, a laptop 6, a thermometer 7, etc.
• the geolocation device 1 of the mobile telephone 2 uses Li-Fi signals emitted in the visible spectrum by the LED lamps 3.
• the geolocation device 1 processes the Li-Fi signals detected by a photodetector 9 and having been emitted by the LED lamps 3 and supplies from the detected Li-Fi signals a relative position of the geolocation device 1 and thus of the mobile telephone 2 in the room with respect to the LED lamps 3, and an absolute position of the geolocation device 1 and therefore of the mobile telephone 2 as a function of the relative position of the geolocation device 1 and the positions of each of the LED lamps 3.
• the geolocation device 1 comprises, for detecting the Li-Fi signals, detection means that comprise the photodiode 9 of the four-quadrant photodiode type 10.
• the photodiode comprises a circular active zone 11 divided into four quadrants 10 having a quadrant shape: a high quadrant 10a, a low quadrant 10b, a left quadrant 10c and a right quadrant 10d.
• Each quadrant 10 constitutes a cell for detecting a radiance of the Li-Fi signals emitted by the LED lamps 3 and detected by the photodetector 9.
• FIGS. 4a to 4c The operation of the photodetector 9 is illustrated by FIGS. 4a to 4c on which are represented different levels of radiances detected by the quadrants 10 in different directions of a light source.
• the high quadrant 10a detects maximum radiance and the low quadrant 10b detects a near zero radiance.
• the left quadrant 10c detects a low intermediate radiance and the right quadrant 10d detects a high intermediate radiance.
• 1 / hand 8 shows the direction of origin of the strongest intensity, once averaged with the intensity of each quadrant.
• the low quadrant 10b detects maximum radiance
• the left quadrant 10c detects a high intermediate radiance
• the high quadrant 10a and the right quadrant 10d detect a low intermediate radiance.
• the eighth needle 8 is moved according to the direction of origin of the strongest intensity, once averaged with the intensity of each quadrant.
• the high quadrant 10a detects maximum radiance and the low quadrant 10b detects a near zero radiance.
• the left quadrant 10c and lOd quad ant right detects a low intermediate radiance, so the needle 8 shows the Prove ⁇ nance direction of the highest intensity, that is to say, here, the middle quadrant 10a.
• each LED lamp 3 emits light according to a radiance diagram 13 having an elliptical shape lobe with a large vertical axis perpendicular to the ceiling of the room.
• Radiance along the vertical axis is a unit radiance, whereas the radiance along an oriented axis of n angle ⁇ corresponds to a fraction of the radiance as a function of ⁇ which is directed towards the photodetector 9 of the geolocation device 1 of the telephone. mobile 2.
• each quadrant 10 depends on the position and orientation of said quadrant 10 with respect to the radiance diagram 13 of each of the LED lamps 3, and therefore the position and orientation of the mobile phone 2 relative to to each of the LED lamps 3.
• the geolocation device 1 comprises processing means 16 which are connected to the four quadrants 10 of the photodetector 9.
• the processing means ⁇ ment 16 acquire electrical signals generated by the quadrants 10 as a function of the detected radiance ,, and produce from these electrical signals if ⁇ measurement signals representative of the radiance detected by each quadrant 10.
• the measurement signals constitute location parameters for estimating the position of the geolocation device 1.
• Characteristics of the radiance diagrams of the LED lamps 3 are stored in a first memory module 17 of the geolocation device 1 connected to the processing means 16.
• the processing means 16 use the measurement signals as well as the characteristics of the radiance diagrams of the LED lamps 3 to estimate the relative position of each quadrant 10 with respect to each LED lamp 3, to deduce therefrom a distance from the mobile telephone 2 with respect to each LED lamp 3, and to provide by triangulation a relative position of the mobile phone 2 with respect to each of the LED lamps 3.
• the geolocation device 1 interrogates each of the LED lamps 3 to know the precise position of each LED lamp 3.
• the geolocation device 1 comprises a Li-Fi transmission module 18 connected to a light-emitting diode 20 and a Li-Fi reception module 19 connected to the photodetector 9.
• the transmission module 18 and the receiving module 19 are respectively adapted to emit via the light emitting diode 20 and receive via the photodetector 9 Li-Fi data at a relatively high rate.
• the geolocation device 1 of the mobile telephone 2 is thus adapted to communicate with each LED lamp 3.
• Each LED lamp 3 comprises a second memory module 23 in which position data (for example GPS coordinates) of the LED lamp 3 are stored.
• each LED lamp 3 transforms its position data into locating signals which are integrated in the Li-Fi signals emitted by the LED lamps 3 and which are transmitted to the geolocation device 1 of the mobile telephone 2.
• the location signals are received by the geolocation dis- ⁇ positive 1 and then acquired by the processing means 16.
• the processing means 16 then provide an absolute position of the mobile phone 2 from the relative position of the mobile phone 2 with respect to each of the LED lamps 3 and from the location signals of each LED lamp 3.
• each quadrant 10 also depends on the orientation of said quadrant 10 with respect to the radiance diagram 13 of each of the LED lamps 3.
• the geolocation device 1 comprises a gyroscope 22 used to ensure that the relative position of the mobile phone 2 with respect to the LED lamps 3 produced by the geolocation device 1 is not impacted by the change in the spatial orientation of the telephone. mobile 2.
• the gyro 22 measures the yaw angle ⁇ 1, the roll angle ⁇ r and the pitch angle ⁇ of the mobile phone 2 and provides the processing means 16 with an estimate of these angles.
• the radiances detected by each quantizer 10 in a reference frame 25 associated with the oriented mobile phone 2 are transformed, via a transformation of coordinates, into corrected radiances corresponding to the projections of the radiances detected in a reference system 26 associated with the horizontal mobile telephone 2.
• a multiplicative factor resulting from the coordinate transformation, stored in the first memory module 17 of the geolocation device 1, is then applied to compensate for the detected loss of radiance.
• the loss in detected radiance is proportional to the inverse of re TM because of the distance R which is distant the photodetector 9 of the LED lamp 3b.
• each quadrant collects light energy as a function of the luminous incidence ⁇ corresponding to each quadrant and to the LED lamp 3b.
• geo.l ocalisation equips again a mobile phone provided with Li-Fi communication means.
• the geolocation device according to the second embodiment of the invention detects again Li-Fi signals emitted by LED lamps (or by other external sources of light emission).
• the geolocation device according to the second embodiment of the invention provides from these detected Li-Fi signals a relative position and an absolute position of the geolocation device and therefore the mobile phone.
• the location parameters used to estimate the position of the geolocation device are LED lamp identification signals contained in the Li-Fi signals sent by the LED lamps.
• the operating principle of the geolocation device according to the second embodiment of the invention consists in considering that the geolocation device is in the immediate vicinity of an LED lamp when it receives, with a low error rate, the signals Li-Fi sent by this LED lamp. The absolute position of the geolocation device is then the same as that of the LED lamp.
• Each LED lamp (or other external light emitting source) continuously transmits LID signals containing identification signals to identify the LED lamp.
• the geolocation device is first of all initialized (step 30).
• Each LED lamp or each external light emitting source emits identification signals (steps 31, 32).
• the geolocation device then detects the L i-Fi signals and therefore the identification signals transmitted via its Li-Fi communication means by each LED lamp or by each other external light emitting source (step 33).
• a user interface of the mobile telephone connected to the geolocation device, displays a message asking the user equipped with the mobile phone to move to a nearest LED lamp or to another source of external light emitting nearest (step 35).
• the geolocation device is then reset (step 36).
• the location device When the identification signals associated with a particular LED lamp or a particular external light source are detected with a detection error rate lower than the predetermined threshold ⁇ , the location device is deemed to be at the same location. position of the particular LED lamp or the particular external light emitting source.
• the geolocation device then interrogates by Li-Fi the particular LED lamp or the particular external light emitting source which transmits by Li-Fi its position data to the geolocation device (step 37).
• the processing means then produces an absolute position of the mobile telephone which corresponds to the position of the particular LED lamp or the particular external light source.
• the absolute position of the mobile phone is then saved (step 38), displayed (step 39), and the geolocation device is put on standby (step 40).
• each LED lamp comprises a second memory module in which position data of the LED lamp are stored, it is possible to simplify the architecture of the lamps to LEDs and connect each LED lamp to a server that transmits them this position data.
• the photodetector comprises means for detecting the geolocation device according to the first embodiment of the invention is intended to detect a radiance of Li-Fi signals
• the detection means can perfectly be adapted to detect any other luminous quantity representative of a perceptible luminous intensity at the level of the geolocation device.

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• Physics & Mathematics (AREA)
• Engineering & Computer Science (AREA)
• Electromagnetism (AREA)
• General Physics & Mathematics (AREA)
• Radar, Positioning & Navigation (AREA)
• Remote Sensing (AREA)
• Computer Networks & Wireless Communication (AREA)
• Telephone Function (AREA)
• Mobile Radio Communication Systems (AREA)
• Position Fixing By Use Of Radio Waves (AREA)

Applications Claiming Priority (2)

Publications (1)

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ID=54937182

Family Applications (1)

Country Status (3)

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• 2015
  • 2015-07-08 FR FR1556469A patent/FR3038732B1/fr active Active
• 2016
  • 2016-07-06 EP EP16736150.0A patent/EP3320361A2/de active Pending
  • 2016-07-06 WO PCT/EP2016/066055 patent/WO2017005826A2/fr active Application Filing
  • 2016-07-20 FR FR1656917A patent/FR3039285B1/fr active Active

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