JP2010117301A - Visible light communication navigation system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable a receiving terminal on a visible light communication navigation system to give an accurate route guidance for a user even before the user moves along a route up to a destination. <P>SOLUTION: A visible light communication navigation system 1 includes many lighting apparatuses 2 to transmit data including positional information on own apparatus by superimposing on the illumination light, and a receiving terminal 3. The receiving terminal 3 includes a determination section 6 to determine the position and direction of the receiving terminal 3, and first and second light-receiving means 41, 42 that have different light-receiving ranges for receiving the illumination light from the lighting apparatuses 2. The determination section 6 determines the position for the receiving terminal 3 from the positional information superimposed on the illumination light received by the first light-receiving means 41 and determines the direction using the positional information superimposed on the illumination light received by the first light-receiving means 41 as a starting point and the positional information superimposed on the illumination light received by the second light-receiving means 42 as an ending point to be the direction of the receiving terminal 3. Thereby the direction can be determined without any history for the positional information. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a visible light communication type navigation system in which a receiving terminal receives data transmitted from a lighting device with a visible light communication function and performs route guidance.

  2. Description of the Related Art Conventionally, a position information system is known that obtains position information by using optical signals transmitted by visible light communication from a plurality of lighting fixtures each fixed at a fixed position indoors (see, for example, Patent Document 1). A user who uses such a location information system carries a receiving terminal that receives an optical signal, and where the user is currently located within a predetermined area based on the map information and the location information notified by the receiving terminal. To figure out. By disposing a large number of lighting fixtures that transmit optical signals within the predetermined area, sufficient resolution (for example, about several meters) for a walking user is given to the position information notified by the receiving terminal. Further, when the destination location information is set, the receiving terminal reads the route data from the storage means to determine the route from the current location to the destination, and guides the route based on the determined route (navigation). ) Navigation systems for notifying guidance information are known. From this guidance information, the user knows what route to travel to the destination.

  Furthermore, even if the receiving terminal does not have a compass (a compass magnet), or even if it has a compass, the compass cannot be used due to the influence of a magnetic field formed in the surrounding environment. There is known a navigation system that determines a moving direction based on the reception history of the.

  However, in the conventional navigation system as described above, when the route to the destination is determined and the user carrying the receiving terminal gets on the route, the direction in which the user is directed by the line segment connecting the lighting fixtures However, before the user gets on the route, the direction in which the user is facing cannot be specified, so accurate route guidance cannot be performed.

Moreover, in order to construct a better lighting environment, a recommended illuminance standard (for example, JISZ9110-1979) according to the application and part is defined. At present, lighting fixtures (light distribution curves) are selected so that such a standard can be satisfied, and the installation position coordinates of each lighting fixture are determined. Therefore, in the position information system in which the portable receiving terminal obtains position information transmitted from a plurality of lighting devices with visible light communication function, the lighting device with visible light communication function is arranged to satisfy the recommended illuminance standard, A lighting device with a visible light communication function is provided at a point where the guide information should be notified to the user, such as a destination or a branch point, or at an interval of, for example, several meters, which is sufficient resolution for the user to use. Not necessarily arranged. For this reason, the conventional navigation system cannot provide accurate route guidance to the user when a lighting fixture with a visible light communication function is not disposed at a point where the guidance information is notified. In addition, the conventional navigation system cannot perform route guidance when the receiving terminal does not receive the position information in the order along the route.
JP 2005-176257 A

  The present invention solves the above-described problem. In a visible light communication type navigation system in which a receiving terminal receives data transmitted from a lighting device with a visible light communication function and provides route guidance to a destination, a user The purpose is to provide accurate route guidance to the user even before the vehicle travels along the route to the destination. It also provides accurate route guidance even when a lighting fixture with visible light communication function is not arranged at the point where the guidance information is notified, and route guidance even when the receiving terminal does not receive location information in the order along the route. The purpose is to be able to.

  In order to achieve the above-described object, the invention of claim 1 is directed to a plurality of lighting fixtures for transmitting data including position information of the own fixture superimposed on the illumination light, and a receiving terminal for receiving data transmitted from the lighting fixture. The receiving terminal includes a determination unit that determines the position and direction of the receiving terminal based on the received data, a notification unit that notifies information, and a setting input unit that sets and inputs a destination And a storage unit for storing guidance information including a route to the set destination and map information, and guidance information stored in the storage unit based on the position and direction of the receiving terminal determined by the determination unit A visible light communication type navigation system having a control unit that notifies the notification unit of the first and second light receiving ranges in which the receiving terminal receives illumination light from the luminaire. A light means, and the determination unit determines the position information received by the first light receiving means as the position of the receiving terminal, the direction calculated based on the history of the determined position information, and the first One of the directions from the position information received by the first light receiving means as the start point and the position information received by the second light receiving means as the end point is determined as the direction of the receiving terminal, and the control unit Based on the angle formed between the determined direction of the receiving terminal and the direction of the route to the destination from the position of the receiving terminal determined by the determining unit, the guide information stored in the storage unit is The notification unit is notified.

  According to a second aspect of the present invention, in the visible light communication type navigation system according to the first aspect, in the case where the lighting device is not arranged at a set destination, the control unit is configured to display the target in the map information. A virtual instrument is arranged on the ground, and the route is determined including the virtual instrument.

  According to a third aspect of the present invention, in the visible light communication type navigation system according to the first or second aspect, the receiving terminal is configured such that the first light receiving means is a set destination and a current position of the receiving terminal. If the data has not been received in the order along the route determined from the above, it is assumed that the data has been received along the route in the order of the luminaire that transmits the current position information and the luminaire in the preceding stage, The determination unit determines the direction of the receiving terminal.

  According to the first aspect of the present invention, there is no history of position information by determining the direction of the receiving terminal from the position information received by the first light receiving means and the position information received by the second light receiving means. Even before moving along the route to the destination, the direction of the receiving terminal, that is, the direction in which the user is facing can be determined, so that accurate route guidance can be performed.

  According to the second aspect of the present invention, when a lighting fixture is not installed at a point where the guide information is notified to the user, a virtual fixture is arranged at the point, and the route is determined by connecting the lighting fixture and the virtual fixture. Therefore, guidance information can be notified at that point, and accurate route guidance can be performed.

  According to the invention of claim 3, when the receiving terminal does not receive the position information in the order along the route, data along the route in the order of the luminaire that transmits the current position information and the luminaire in the preceding stage is transmitted. Therefore, even if the user deviates from the route, route guidance can be performed.

  A visible light communication type navigation system according to a first embodiment of the present invention will be described with reference to FIGS. FIG. 1A shows a configuration of a visible light communication navigation system 1 (hereinafter referred to as a navigation system) according to the present embodiment, and FIG. 1B shows a configuration of each lighting fixture 2 provided in the navigation system 1. The navigation system 1 includes a plurality of lighting fixtures 2a, 2b, 2c, 2d, etc. (collectively referred to as lighting fixtures 2) that transmit data including position information of the own fixture superimposed on the illumination light, and each lighting fixture 2 Receiving terminal 3 for receiving the data transmitted from.

  The luminaire 2 includes a light source 21 that emits light, a lighting unit 22 that turns on the light source 21, an illumination storage unit 23 that stores position information where the own lighting device 2 (own device) is disposed, and a lighting unit 22. And an illumination control unit 24 that controls the operation of the illumination storage unit 23.

  The light source 21 is, for example, a discharge lamp or a light emitting diode. The lighting unit 22 is, for example, an inverter circuit or a DC power supply circuit. The lighting fixture 2 may have a plurality of light sources 21 and lighting parts 22. The illumination storage unit 23 is, for example, a nonvolatile memory. The illumination control unit 24 is, for example, a control integrated circuit (Micro Controller).

  In the lighting fixture 2 having the above-described configuration, the lighting control unit 24 controls the lighting unit 22 so that the light of the light source 21 is converted into an optical signal by frequency modulation using a high-frequency carrier wave that cannot be recognized by human eyes. . For example, when a discharge lamp as the light source 21 and an inverter circuit as the lighting unit 22 are used in combination, the frequency modulation is performed by controlling the frequency of AC power supplied from the inverter circuit to the discharge lamp. This optical signal can be received in a range where the light from the light source 21 is irradiated.

  The optical signal transmitted by the lighting fixture 2 is, for example, “start code”, “ID (position information)”, “error detection” based on NMEA0183, which is a standard established by the National Marine Electronics Association. This is a 32-byte signal composed of “code” and “terminal code”, and is transmitted at a transmission rate of 9600 bps, for example. The position information represented by the optical signal may be, for example, the contents of latitude, longitude, and altitude, and the floor number in the building may be used instead of the altitude. In addition, if the expression using a unique coordinate system for each building is used, or if the expression is based on an identification code assigned to each lighting fixture 2 in advance, the data amount of the optical signal is larger than when using a common expression with the GPS signal. This reduces the time required for transmission / reception of optical signals and improves the reliability of transmission / reception of optical signals.

  The receiving terminal 3 receives the illumination light from the lighting fixture 2 and converts it into an electrical signal, a processing unit 5 that demodulates data from the electrical signal converted by the light receiving unit 4, A determination unit 6 that determines the position and direction of the receiving terminal 3 based on the data, a control unit 7 that controls the operation of each unit, and a storage unit that stores guidance information including the route to the set destination and map information 8, a setting input unit 9 for setting and inputting a destination, and a notification unit 10 for reporting information. The receiving terminal 3 may be incorporated into a voice information output terminal such as a mobile phone, PDA (Personal Digital Assistant), portable digital music player, PC (personal computer), or the like, or a separate type added to the voice information output terminal. It may be configured as follows.

  The light receiving unit 4 includes a first light receiving unit 41 (first light receiving unit) and a second light receiving unit 42 (second light receiving unit) having different light receiving ranges. The first light receiving unit 41 includes two photoelectric conversion units 411 and 412, and the second light receiving unit 42 includes two photoelectric conversion units 421 and 422. The photoelectric conversion units included in the first light receiving unit 41 and the second light receiving unit 42 are not limited to two, and may be one or three or more.

  The photoelectric conversion units 411, 412, 421, and 422 are a lens formed from a light-transmitting material such as acrylic resin, and a photoelectric conversion element such as a PIN photodiode that receives light transmitted through the lens and converts it into an electrical signal. And an amplifier circuit for amplifying the electric signal output from the photoelectric conversion element. The outer shape of the lens is, for example, a rectangular parallelepiped shape or a cubic shape, but is not limited thereto. The lens may be shaped so that light having a predetermined wavelength is incident on the light receiving element. Instead of the PIN photodiode, a photo IC in which a photo transistor or a photodiode and an amplifier circuit are integrated may be used. The amplifier circuit is, for example, a differential amplifier circuit configured by a general-purpose operational amplifier IC or the like, but may be a discrete circuit configured by a transistor or the like instead of the operational amplifier IC. Further, the amplifier circuit may be omitted if the electrical signals output from the photoelectric conversion units 411, 412, 421, and 422 are at a level sufficient for demodulation processing by the processing unit 5.

  Here, the light receiving range of the light receiving unit 4 will be described with reference to FIG. FIG. 2 shows an example of the positional relationship between the luminaire 2 and the receiving terminal 3. The receiving terminal 3 is used while being held substantially horizontally in the direction in which the user is facing. The first light receiving unit 41 defines a light receiving range S1 within a predetermined angle above the receiving terminal 3 held substantially horizontally, and the second light receiving unit 42 is positioned in front of the light receiving range S1 of the first light receiving unit 41. The inside of the predetermined angle is the light receiving range S2. Of the light receiving range S1 of the first light receiving unit 41, the rear side is the light receiving range S11 of the photoelectric conversion unit 411, and the front side is the light receiving range S12 of the photoelectric conversion unit 412. Of the light receiving range S2 of the second light receiving unit 42, the rear side is the light receiving range S21 of the photoelectric conversion unit 421, and the front side is the light receiving range S22 of the photoelectric conversion unit 422. The light receiving ranges S11, S12, S21, and S22 of the photoelectric conversion units 411, 412, 421, and 422 are set so as not to overlap each other.

  The user recognizes the illumination light emitting information and holds the receiving terminal 3 over the light or directs the receiving terminal 3 toward the light to acquire the information. However, when receiving light with the receiving terminal 3 held in the hand, especially during walking, the light receiving axis is likely to be shaken, so there is a prisoner who acquires incorrect information. In this case, by using a push button switch of the setting input unit 9 or the like, the control unit 7 performs normal processing when the switch is turned on, and controls to discard the information acquired by the control unit 7 as noise information when the switch is turned off. , May improve reliability.

  Again, a description will be given with reference to FIG. The processing unit 5 includes a filter circuit 51 that discriminates the frequency component of the modulation frequency from the reception signal (electric signal) output from the light receiving unit 4, and a demodulation circuit 52 that demodulates the reception signal that has passed through the filter circuit 51 into data. Have. The filter circuit 51 includes a band-pass filter, an operational amplifier, and the like, and includes, for example, an LC passive Chebyshev band-pass filter. The demodulation circuit 52 includes a comparison circuit that compares the signal strength of the received signal that has passed through the filter circuit 51 with a threshold value. This comparison circuit is composed of a comparator IC or the like, and outputs an H level (communication signal “1”) signal when a frequency component twice the modulation frequency passes through the filter circuit 51, and at other times an L level. The received signal is demodulated by outputting the signal (communication signal “0”).

  The processing unit 5 demodulates the data superimposed on the illumination light emitted from the luminaire 2 into binary data “1” and “0”. Specifically, the demodulation circuit 52 stores the value of the communication signal associated with the signal frequency, and performs binarization processing based on the presence or absence of the signal frequency. For example, when the signal frequency received from the lighting fixture 2 is set to 130 kHz, the demodulating circuit 52 binarizes 130 kHz to the communication signal “1” and frequencies other than 130 kHz to the communication signal “0”.

  The determination unit 6 includes a control integrated circuit as a main component, and includes a data recognition unit 61, a comparison unit 62, a position determination unit 63, and a direction determination unit 64.

  The data recognition unit 61 recognizes whether the binarized data output from each demodulation circuit 52 is correctly decoded by a predetermined pattern. Specifically, for example, when it is determined that “$” is given as the start signal of the position information data at the beginning of the binarized data, the data recognition unit 61 starts the start signal “$ at the beginning of the binarized data. If "" is present, the binarized data is position information data, and if there is no start signal "$", it is recognized as noise.

  The comparison unit 62 compares the peak (analog) voltage values of the received signals that have passed through the filter circuits 51, and ranks the signal intensity of the illumination light on which the data is superimposed, that is, the optical signal.

  The position determining unit 63 determines the position of the receiving terminal 3 based on the optical signal from the first light receiving unit 41. The optical signal having the strongest signal intensity among the optical signals received by the first light receiving unit 41 is determined, and the position of the lighting fixture 2 that has transmitted the optical signal having the strongest signal intensity is defined as the position of the receiving terminal 3. judge. Then, the position information included in the optical signal is determined as the position of the receiving terminal 3.

  The direction determination unit 64 includes a first direction determination unit 641 and a second direction determination unit 642. The first direction determination unit 641 determines the direction of the receiving terminal 3 based on the history of the position information determined by the position determination unit 63 among the data from the first light receiving unit 41. The second direction determination unit 642 uses the position information determined by the position determination unit 63 among the data from the first light receiving unit 41 as a starting point, and the signal intensity of each optical signal received by the second light receiving unit 42 is The strongest optical signal is determined, and the direction in which the position of the lighting fixture 2 that transmitted the optical signal having the strongest signal intensity is the end point is determined as the direction of the receiving terminal 3. That is, the direction of the receiving terminal 3 is the direction starting from the position information superimposed on the illumination light received by the first light receiving unit 41 and the end point of the position information superimposed on the illumination light received by the second light receiving unit 42. Determined. The direction may be determined based on the direction of the position of the luminaire 2 that has transmitted the light signal having the weakest signal intensity. However, the light signal having a strong signal intensity causes less communication error, and thus the light having the strong signal intensity. It is preferable to determine by a signal.

  Here, the operation of the determination unit 6 configured as described above will be described with reference to FIG. In the example shown in FIG. 2, the signal intensity of the optical signal Da from the lighting fixture 2a is stronger than the optical signal Db from the lighting fixture 2b, and the position determination unit 63 determines that the receiving terminal 3 is at the position of the lighting fixture 2a. To do. The optical signal received by the second light receiving unit 42 is only Dc, and the direction determining unit 64 determines that the receiving terminal 3 is directed from the position of the lighting fixture 2a toward the lighting fixture 2c that transmitted the optical signal Dc. To do.

  Again, a description will be given with reference to FIG. In the storage unit 8, as map information, the ID (position information) of the luminaire 2, the coordinates (X, Y, Z) of the luminaire 2, weighted data based on the interconnection of the luminaire ID (the center of each luminaire 2) The distance (m) between points is stored. The connection relationship of the lighting fixture ID is determined according to the shape of the building and the arrangement of the lighting fixture 2.

  Next, map information stored in the storage unit 8 will be described with reference to FIG. FIG. 3 shows an example of data for route guidance on a certain floor in a building where the navigation system 1 is used. A courtyard 31 is disposed in the central portion of the building, and facility facilities such as a room 32, a staircase 33, a WC 34, and an elevator 35 are disposed in an outer edge portion of the indoor space surrounding the courtyard 31. A passage 36 is located between each facility and the courtyard 31. The arrangement of the facility equipment and the passage is stored in the storage unit 8 as map information.

  A plurality of lighting fixtures 2 are arranged on the ceiling of the passage 36. ID of the lighting fixture 2 of the said floor is 19-40. Each lighting fixture 2 transmits an optical signal in which data including ID (position information) of the own fixture is superimposed on the illumination light. The point of each lighting fixture 2 is a node, and each node has the ID of the lighting fixture 2 at that node as a node ID. The connection relationship of the lighting fixture ID is represented by a line segment (link) connecting adjacent nodes.

  When the lighting fixture 2 is not arranged at a point where the guidance information is notified from the notification unit 10 of the receiving terminal 3 such as a destination, the virtual appliance 37 is arranged at the point in the map information stored in the storage unit 8. Then, a virtual node ID having the point as a virtual node can be set, and weighted data (distance) by connection between the virtual node ID and the lighting fixture ID is stored in the storage unit 8. In FIG. 3, the virtual node ID is shown in parentheses (the same applies hereinafter).

  In addition to the map information, the storage unit 8 includes an angle formed by the position determined by the position determination unit 63 (current position), the direction determined by the direction determination unit 64, and the direction of the route to the destination. Content such as a voice message, an image message, and vibration content that is notified based on the information is stored as guidance information.

  Again, a description will be given with reference to FIG. The setting input unit 9 is configured by, for example, a push button switch, a touch panel, or the like, and inputs a destination setting or the like by the user.

  The control unit 7 includes a control integrated circuit as a main component, and mainly performs the following four controls. First, the control unit 7 uses the Dijkstra's Algorithm or the like from the position information determined by the position determination unit 63 and the destination information input from the setting input unit 9 to start from the destination. Route data (the order of the route data from the departure point to the destination) is determined to determine the route and stored in the storage unit 8.

  Second, the control unit 7 has the reception history of the data determined by the position determination unit 63, and the reception determined by the first direction determination unit 641 when the data is in the order along the route. The notification unit 10 is notified of guidance information based on the angle formed by the direction of the terminal 3 and the route direction starting from the position of the receiving terminal 3 determined by the position determination unit 63.

  Thirdly, when there is no data reception history determined by the position determination unit 63, the control unit 7 determines the direction of the receiving terminal 3 determined by the second direction determination unit 642 and the position determination unit 63. The notification unit 10 is notified of guidance information based on an angle formed with the direction of the route starting from the position of the received receiving terminal 3.

  Fourthly, if there is a reception history of the data determined by the position determination unit 63 and the control unit 7 is not in an order along the route, the control unit 7 transmits the current position information and the previous stage of the route. Assuming that the position information is received along the route in the order of the lighting fixtures 2, the notification unit 10 is notified of the guide information based on the direction determined by the first direction determination unit 641.

  The notification unit 10 notifies the user of the guide information stored in the storage unit 8 and includes a liquid crystal display device or the like. The information may be notified by voice, or may be composed of a vibration generating device for a mobile phone, and may be notified by vibration, or may be a combination thereof.

  In addition to the above configuration, the navigation system 1 is provided with a server (not shown) that is wirelessly accessed from the receiving terminal 3, and data associated with the ID (position information) is stored in the storage unit 8 of the receiving terminal 3. If not, a request signal may be transmitted to the server, and data associated with the ID (position information) may be received from the server and stored in the storage unit 8.

  Next, route guidance by the navigation system 1 configured as described above will be described with reference to FIG. FIG. 4 shows an example of a route from the departure point to the destination. In this example, the lighting fixture 2 is arrange | positioned in the departure place, and the node ID is ID19. The lighting fixture 2 is not arranged at the destination, and therefore the virtual appliance 37 is arranged in the map information. The virtual node ID is ID104. The navigation system 1 performs route guidance by the following steps.

  [Step 1] In the receiving terminal 3, the destination 104 is set by inputting the ID 104, which is the destination information, from the setting input unit 9 by the user. The destination information ID 104 is stored in the storage unit 8.

  [Step 2] The first light receiving unit 41 receives the ID superimposed on the illumination light from the luminaire 2, and the position determination unit 63 determines that the current location (departure location) is the node ID 19. This departure point information ID 19 is stored in the storage unit 8.

  [Step 3] The control unit 7 uses the Dijkstra algorithm to calculate the shortest route to the destination. From the current location information and the destination information, a route ID (ID19-ID40-ID39-ID37-ID38-ID104) is determined as the shortest route and stored in the storage unit 8 as a route to the destination (shown by a thick arrow). .

  [Step 4-1] At the departure place, the first light receiving unit 41 receives illumination light from directly above (ID19). The second light receiving unit 42 receives illumination light from the traveling direction. ID40 is superimposed on the illumination light from the traveling direction. The second direction determination unit 642 determines the direction of the receiving terminal 3, that is, the direction of the user based on ID 19 and ID 40. The control unit 7 calculates a unit vector of the direction of the user from the coordinates of ID19 and ID40, and a unit vector of the direction of the route from the coordinates of the current location ID19 to the coordinates of ID19 next to ID19 calculated from the route ID And the angle θ formed by these two unit vectors is calculated. Since the angle θ is calculated as 0 °, the control unit 7 causes the notification unit 10 to notify the message “Proceed forward” as the guidance information. The guidance information to be notified is determined based on the angle θ. When two receiving terminals 3 are used, the voice quality of the message output (for example, male voice and female voice) may be changed in order to identify the messages from the respective receiving terminals 3 with each other.

  [Step 4-2] The first light receiving unit 41 receives the illumination light from the lighting fixture 2 in the order of ID19 and ID40. The first direction determination unit 641 determines the orientation of the user based on ID (position information) reception history (ID19, ID40). The control part 7 makes the alerting | reporting part 10 alert | report the guidance information according to the direction.

  [Step 4-3] The first light receiving unit 41 receives illumination light in the order of ID40 and ID39. The first direction determination unit 641 determines the orientation of the user based on ID (position information) reception history (ID40, ID39). The control part 7 makes the alerting | reporting part 10 alert | report the guidance information according to the direction.

  [Step 4-4] The first light receiving unit 41 receives illumination light in the order of ID39 and ID37. The first direction determination unit 641 determines the orientation of the user based on ID (position information) reception history (ID39, ID37). The control part 7 makes the alerting | reporting part 10 alert | report the guidance information according to the direction.

  [Step 4-5] The first light receiving unit 41 receives illumination light in the order of ID37 and ID38. The first direction determination unit 641 determines the direction of the user based on ID (position information) reception history (ID37, ID38). The control unit 7 calculates a unit vector of the user direction from the coordinates of ID 37 and ID 38, and calculates a unit vector of the direction of the route from the coordinates of ID 38 of the current location and the coordinates of ID 104 next to ID 38 calculated from the route ID. The angle θ formed by these two unit vectors is calculated. Since the angle θ is calculated as 270 °, the control unit 7 causes the notification unit 10 to notify the message “go right” as the guidance information.

  As described above, the navigation system 1 determines the direction of the receiving terminal 3 from the position information received by the first light receiving unit 41 and the position information received by the second light receiving unit 42, so that there is no history of position information. Even before the user moves along the route to the destination (before getting on the route), it is possible to determine the direction of the receiving terminal 3, that is, the direction in which the user is facing, so that accurate route guidance can be performed. .

  Further, when the lighting device 2 is not installed at the point where the guidance information is notified to the user, the navigation system 1 arranges the virtual device 37 at the point and connects the lighting device 2 and the virtual device 37 to the route. Therefore, guidance information can be notified at that point, and accurate route guidance can be performed.

  Here, the guidance information notified from the notification unit 10 will be described in detail with reference to FIGS. 5 and 6. FIG. 5 shows an example of the angle of the line segment (link) connecting the nodes in the data stored in the storage unit 8. The direction of the route from one node to the next node in the route is obtained by referring to the storage unit 8.

  FIG. 6 shows a message example as guidance information notified from the notification unit 10. The message notified from the notification unit 10 is, for example, voice and screen display. Corresponding to the angle θ formed by the direction of the user and the direction of the route, a voice synthesis message and a screen display message are stored in the storage unit 8 in the form of a table. For example, when the angle θ is 150 °, the control unit 7 refers to the table in the storage unit 8 and causes the notification unit 10 to notify “Return to the back” by voice and screen display. In the example message, the message is stored with a step size of about 30 °, but the message is not limited to this. A voice message may be output by synthesizing voice from a character string, or may be reproduced by storing a pre-recorded message in the storage unit 8 as a playback WAV (RIFF waveform audio format) file. . When there is a reproduction WAV file corresponding to the angle θ, the file name of the reproduction WAV file is associated with the angle θ by the table. When there is no WAV file for reproduction, a character string (null) is set in the table.

  Next, in the route guidance by the navigation system 1 from the departure place ID 19 to the destination ID 104, after receiving the ID 19, the receiving terminal 3 receives the ID 39 without receiving the ID 40 (the ID 40 is skipped) again. This will be described with reference to FIG.

  [Step 1] In the receiving terminal 3, the destination 104 is set by inputting the ID 104, which is the destination information, from the setting input unit 9 by the user.

  [Step 2] The first light receiving unit 41 receives the ID superimposed on the illumination light from the luminaire 2, and the position determination unit 63 determines that the current location (departure location) is the node ID 19.

  [Step 3] The control unit 7 uses the Dijkstra algorithm to calculate the shortest route to the destination. From the current location information and the destination information, the route ID (ID19-ID40-ID39-ID37-ID38-ID104) is determined as the shortest route.

  [Step 4] The first light receiving unit 41 receives illumination light in the order of ID19 and ID39. Since the reception history (ID19, ID39) of ID (position information) is not in the order along the route, the first direction determination unit 642 includes the lighting fixture 2 (ID39) that transmits the current position information and its Receiving history (ID40, ID39) of ID (positional information) that changes the reception history and changes the orientation of the user, assuming that the positional information has been received along the route in the order of the front lighting fixture 2 (ID40) ) Judgment based on. The control unit 7 causes the notification unit 10 to notify the guide information according to the direction.

  Thus, when the receiving terminal 3 does not receive the position information in the order along the route, the navigation system 1 sets the route in the order of the luminaire 2 that transmits the current position information and the luminaire 2 in the preceding stage. Since it is considered that data has been received along the route, route guidance can be performed even when the user deviates from the route.

  In addition, this invention is not restricted to the structure of said embodiment, A various deformation | transformation is possible in the range which does not change the summary of invention. For example, when providing a server, the server may be installed in the same building where the receiving terminal 3 is used and connected to the receiving terminal 3 through a wireless LAN, or installed in a different building and receiving terminal. 3 may be connected by data communication between the mobile phone and the mobile phone.

(A) is a block block diagram of the navigation system which concerns on embodiment of this invention, (b) is a block block diagram of the lighting fixture in the same system. The figure which shows an example of the positional relationship of the lighting fixture and receiving terminal in the same system. The figure which shows the example of the map information in the same system. The figure which shows an example of the route in the route guidance in the same system. The figure which shows the example of an angle of the line segment which connects between the nodes in the same system. The figure which shows the example of guidance information alert | reported from the alerting | reporting part in the same system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Navigation system 2, 2a, 2b, 2c, 2d Lighting fixture 3 Reception terminal 41 1st light-receiving part (1st light-receiving means)
42 2nd light-receiving part (2nd light-receiving means)
6 determination unit 63 position determination unit 641 first direction determination unit 642 second direction determination unit 7 control unit 8 storage unit 9 setting input unit 10 notification unit 37 virtual instrument

Claims (3)

A plurality of lighting fixtures for transmitting data including the position information of the own fixture superimposed on the illumination light, and a receiving terminal for receiving data transmitted from the lighting fixture,
The receiving terminal is set with a determination unit that determines the position and direction of the receiving terminal based on the received data, a notification unit that broadcasts information, and a setting input unit that sets and inputs a destination A storage unit that stores guidance information including a route to the destination and map information, and guidance information stored in the storage unit based on the position and direction of the receiving terminal determined by the determination unit are stored in the notification unit. A visible light communication type navigation system having a control unit for notification,
The receiving terminal includes first and second light receiving means having different light receiving ranges for receiving illumination light from the lighting fixture,
The determination unit determines the position information received by the first light receiving means as the position of the receiving terminal, the direction calculated based on the history of the determined position information, and the first light receiving means. The direction of the receiving terminal is determined as any one of the directions starting from the received position information and the position information received by the second light receiving means as the end point,
The control unit is configured to store the memory based on an angle between a direction of the receiving terminal determined by the determining unit and a direction of a route to a destination starting from the position of the receiving terminal determined by the determining unit. A visible light communication type navigation system, characterized by causing the notification unit to notify the guide information stored in the unit.   When the lighting device is not arranged at the set destination, the control unit arranges the virtual device at the destination in the map information and determines the route including the virtual device. The visible light communication type navigation system according to claim 1.   When the first light receiving unit has not received data in the order along the route determined from the set destination and the current position of the receiving terminal, the receiving terminal displays the current position information. The determination unit determines the direction of the receiving terminal, assuming that data is received along a route in the order of the luminaire to be transmitted and the luminaire in the preceding stage. The visible light communication type navigation system described.

Images