CN114944869A - Indoor guiding method and system - Google Patents

Indoor guiding method and system Download PDF

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Publication number
CN114944869A
CN114944869A CN202210422957.XA CN202210422957A CN114944869A CN 114944869 A CN114944869 A CN 114944869A CN 202210422957 A CN202210422957 A CN 202210422957A CN 114944869 A CN114944869 A CN 114944869A
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user
module
successfully matched
visible light
division multiplexing
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CN114944869B (en
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赵爽
由骁迪
高明义
沈纲祥
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Suzhou University
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Suzhou University
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
    • H04B10/114—Indoor or close-range type systems
    • H04B10/116—Visible light communication
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F18/00—Pattern recognition
    • G06F18/20—Analysing
    • G06F18/22—Matching criteria, e.g. proximity measures
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/33—Services specially adapted for particular environments, situations or purposes for indoor environments, e.g. buildings
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B44/00—Circuit arrangements for operating electroluminescent light sources
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/175—Controlling the light source by remote control
    • H05B47/19—Controlling the light source by remote control via wireless transmission
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection

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Abstract

The invention discloses an indoor guiding method and a system, comprising the following steps: receiving user information sent by a plurality of user sides, and judging whether the user information is successfully matched; calling the color of the room corresponding to the successfully matched user information; based on the number of the successfully matched user terminals, adopting wavelength division multiplexing and other technologies to transmit the room color corresponding to the successfully matched user information to the user terminals; sending all the successfully matched room colors to an LED indicating end, and controlling the LED indicating end to guide; the assigned room color is updated in real time according to the predetermined information. The invention has a matching mechanism, can avoid the interference of other signal sources, establishes a private line connection, can realize the simultaneous use of multiple users, and uses the combination of wavelength division multiplexing and other multiplexing technologies to lead the users to be independently connected.

Description

Indoor guiding method and system
Technical Field
The invention relates to the technical field of positioning, in particular to an indoor guiding method and system.
Background
The deep application of the position service and the expansion of the activity requirements of people enable the requirements of indoor positioning and navigation services to be more and more vigorous. Compared with the outdoor environment, the indoor environment is more complicated due to the existence of multiple floors, structural deployment and other numerous indoor space elements, which requires that the indoor navigation needs to be divided more finely for the construction of an indoor model, and provides more accurate guidance, so that pedestrians can obtain reliable navigation guidance in the independently divided spaces. For example, when a participant participates in a large-scale meeting, the participant wants to have an efficient and convenient guidance device when entering a branch room, hotel passengers want to find a room to be checked in quickly according to guidance, and restaurant customers want to find a reserved box according to guidance. This technical field development is comparatively slow at present, mainly is leading with artifical guide, and the sign guide is assisted, and information ization degree is lower, and is efficient.
The commonly used indoor guiding methods are: indoor location and navigation, through utilizing technologies such as cell-phone basic station, bluetooth, Wifi, provide indoor real-time location for the user, for its planning route, convenience of customers finds indoor specific certain room. However, most of these techniques are affected by electromagnetic interference, are difficult to perform accurate positioning, are more vague for layered indoor positioning, and are limited by excessive cost due to the need to additionally deploy a positioning system.
In conclusion, it can be seen that how to improve the accuracy of indoor guidance is a problem to be solved at present.
Disclosure of Invention
The invention aims to provide an indoor guidance method and an indoor guidance system, which solve the problem that the indoor guidance system in the prior art is easy to cause inaccurate and discontinuous interference.
In order to solve the above technical problem, the present invention provides an indoor guiding method applied to a central control end installed in a lighting system, including: receiving user information sent by a plurality of user sides, and judging whether each user information is successfully matched;
calling the room color corresponding to the successfully matched user information according to the number of the successfully matched user sides and the user information;
based on the number of the successfully matched user terminals, selecting different transmission modes to transmit the room color distribution corresponding to the successfully matched user information to the successfully matched user terminals, wherein the different transmission modes comprise a wavelength division multiplexing technology, a multiplexing technology combining wavelength division multiplexing and time division multiplexing, a multiplexing technology combining wavelength division multiplexing and frequency division multiplexing, and a multiplexing technology combining wavelength division multiplexing and code division multiplexing;
sending the room colors corresponding to all the successfully matched user information to an LED indicating end, and controlling the LED indicating end to guide;
and if the user information is not successfully matched, prompting that the user side is not successfully registered.
Preferably, the selecting different transmission modes to transmit the room color distribution corresponding to the successfully matched user information to the successfully matched user terminal based on the number of the successfully matched user terminals includes:
judging whether the number of the successfully matched user sides is less than or equal to the number of the LED chips in the visible light transmission lamp group of the visible light transmission central control end;
when the number of the successfully matched user terminals is less than or equal to the number of the LED chips in the visible light transmission lamp group, transmitting the room color corresponding to the successfully matched user information to the successfully matched user terminals by using a wavelength division multiplexing technology;
when the number of the successfully matched user terminals is larger than the number of the LED chips in the visible light transmission lamp group, any one of a multiplexing technology combining wavelength division multiplexing and time division multiplexing, a multiplexing technology combining wavelength division multiplexing and frequency division multiplexing, and a multiplexing technology combining wavelength division multiplexing and code division multiplexing is used for transmitting the room color corresponding to the successfully matched user information to the successfully matched user terminals;
the number of the LED chips in the visible light transmission lamp group is more than or equal to 3.
Preferably, the transmitting the room color corresponding to the successfully matched user information to the successfully matched user terminal by using a multiplexing technology combining wavelength division multiplexing and time division multiplexing includes:
calculating the number of time slots according to the number of the successfully matched user sides and the number of the LED chips in the visible light transmission lamp group, wherein the number of the time slots is (the number of the user sides/the number of the LED chips in the visible light transmission lamp group) + 1;
dividing all successfully matched user terminals into a plurality of time slots and wavelength groups according to the number of the LED chips in the visible light transmission lamp group and the number of the time slots;
and transmitting the room color corresponding to each successfully matched user information to the corresponding successfully matched user terminal according to the time slot and the wavelength grouping of the user terminal.
Preferably, the transmitting the room color corresponding to the successfully matched user information to the successfully matched user terminal by the multiplexing technology combining the wavelength division multiplexing and the frequency division multiplexing includes:
calculating to obtain the number of frequencies according to the number of the successfully matched user sides and the number of the LED chips in the visible light transmission lamp group, wherein the number of the frequencies is (the number of the user sides/the number of the LED chips in the visible light transmission lamp group) + 1;
dividing all the successfully matched user terminals into a plurality of frequency and wavelength groups according to the number of the LED chips in the visible light transmission lamp group and the number of the frequencies;
and transmitting the room color corresponding to each successfully matched user information to the corresponding successfully matched user terminal according to the frequency and wavelength groups of the user terminal.
Preferably, the transmitting the room color corresponding to the successfully matched user information to the successfully matched user terminal by using a multiplexing technology combining wavelength division multiplexing and code division multiplexing includes:
calculating to obtain the number of code words according to the number of the successfully matched user sides and the number of the LED chips in the visible light transmission lamp group, wherein the number of the code words is (the number of the user sides/the number of the LED chips in the visible light transmission lamp group) + 1;
dividing all the successfully matched user terminals into a plurality of code words and wavelength groups according to the number of the LED chips and the number of the code words in the visible light transmission lamp group;
and transmitting the room color corresponding to each successfully matched user information to the corresponding successfully matched user terminal according to the code word and the wavelength group of the user terminal.
Preferably, the sending the room colors corresponding to all the successfully matched user information to an LED indication terminal, and controlling the LED indication terminal to direct includes:
wirelessly transmitting the room colors corresponding to all successfully matched user information to the LED indicating end;
and controlling the LED indicating end to light the LED light with the same color as the room for guiding according to the successfully matched user information.
Preferably, the sending the room colors corresponding to all the successfully matched user information to the LED indication terminal, and controlling the LED indication terminal to direct includes:
judging whether each user information successfully matched contains other preset information, wherein the preset information comprises: the method comprises the following steps of (1) identifying a user, presetting starting time, presetting ending time, presetting room number and presetting corresponding colors of rooms;
if the user information which is successfully matched currently does not contain the other preset information, the user information which is successfully matched currently is cancelled;
if the current user information contains other preset information, sequencing the preset information according to the preset starting time, and recalling the color of a new room corresponding to the current user information;
and transmitting the new room color corresponding to the current user information to the user side corresponding to the current user information.
Preferably, an indoor guidance system, comprising:
the central control end is installed in the lighting system and comprises: the system comprises a database module, a coordination module, a first Wifi module and a first visible light communication module, wherein the coordination module is respectively connected with the database module, the first visible light communication module and the first Wifi module, the central control end is used for receiving and matching user information sent by a plurality of user ends, utilizing the coordination module to call room colors corresponding to the user information which is successfully matched, distributing and transmitting the room colors corresponding to the user information which is successfully matched to the user ends which are successfully matched by adopting the technology of combining wavelength division multiplexing, time division multiplexing, frequency division multiplexing and code division multiplexing, and wirelessly sending the room colors corresponding to all the user information which is successfully matched to an LED indicating end; the user side is located the user side, includes: the second visible light communication module is respectively connected with the filter module, the display module and the registration module, and the user side is used for collecting user ID, switching the filter to filter components with other wavelengths and displaying the registration state of the user and the color of a room matched with the user;
LED pilot end is located indoor corridor wall limit, includes: the second Wifi module is connected with the indication control module, the indication control module is connected with the LED indication module, and the LED indication terminal is used for receiving room colors corresponding to all successfully matched user information sent by the central control terminal and controlling the LED indication module to guide; the LED indicating module is composed of a plurality of strip-shaped LED arrays, displayed light is presented by any one of arrows, dynamic walking pictures or English characters, room colors corresponding to successfully matched users are lightened in a circulating mode, the filter module is composed of at least three filters of red, green and blue colors, the filters are switched in a rotating mode according to wavelengths distributed by the central control end, the second visible light communication module is shielded by the filters of specific colors, and wavelength division multiplexing signals and signals generated by other multiplexing modes are filtered and demodulated;
the central control terminal is communicated with the LED indicating terminal through the first Wifi module and the second Wifi module, and a bidirectional communication link is established between the first Wifi module and the second Wifi module through a Wifi technology;
the central control end and the user end communicate through the first visible light communication module and the second visible light communication module, and a bidirectional communication link is established between the first visible light communication module and the second visible light communication module through a visible light communication technology.
Preferably, the central control terminal further comprises: the sensing module and the lens module are respectively connected with the coordination module;
the sensing module is used for detecting whether a user exists in the coverage range of the system;
the lens module is used for magnifying or reducing light spots irradiated by the first visible light communication module and increasing or reducing the coverage area of the system;
when the sensing module detects that a user is in the system coverage area, the LED indicating module is controlled to be on, and the distance from the lens module to the first visible light communication module is shortened, so that the coverage range of a light spot emitted by the first visible light communication module is enlarged, the duration of a light spot enlargement state is equal to the diameter of the light spot divided by the preset user moving speed, and after the duration is finished, the distance from the lens module to the first visible light communication module is increased, and the original light spot size is recovered;
and when the sensing module detects that no user exists in the system coverage area, the LED indicating module is controlled to be turned off.
Preferably, the first visible light communication module is composed of a visible light transmission lamp group and a photoelectric detector, wherein the visible light transmission lamp group is at least composed of three LED chips of red, green and blue;
the visible light transmission lamp set respectively emits red, green and blue wavelengths, and the three wavelengths are synthesized into white light, so that wavelength division multiplexing is realized and transmitted to the filter module.
The invention provides an indoor guiding method and a system, firstly receiving user information sent by a plurality of user terminals, judging whether each user information is successfully matched, calling room color corresponding to the successfully matched user information according to the number of the successfully matched user terminals and the user information, then selecting different transmission modes according to the number of the user information to transmit the room color matched with each user information to the user terminals, transmitting the room color matched with each user information to an LED indicating terminal, and controlling the indicating terminal to guide, the invention adds a matching mechanism, can avoid the interference of other signal sources, establishes a special line connection, can realize the simultaneous use of multiple users, uses other wavelength division multiplexing combination multiplexing technology to enable each user to be independently connected, independently transmits the information without interference between every two users, the correct information can still be accurately transmitted when the system is used by a plurality of users, so that the accuracy of the transmitted information is ensured; the LED indicating end is adopted for guiding, so that the guiding is more continuous, a user can walk according to the LED indicating end intuitively, the problem that a part of users are difficult to understand and follow a virtual route is solved, and the timeliness and the high efficiency of the guiding are improved; in addition, the invention can reduce the installation density of the central control end, and turn on or turn off the LED indicating end in real time, thereby realizing energy conservation and consumption reduction.
Drawings
In order to more clearly illustrate the embodiments or technical solutions of the present invention, the drawings used in the embodiments or technical solutions of the present invention will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an indoor guidance system provided in the present invention;
FIG. 2 is a flow chart of a first embodiment of an indoor guidance method provided by the present invention;
FIG. 3 is a flowchart of a second embodiment of an indoor guidance method according to the present invention;
fig. 4 is a schematic diagram of a light spot change process of the indoor guiding method provided by the present invention.
Detailed Description
The core of the invention is to provide an indoor guidance method and a system, a matching mechanism is introduced, the interference degree is reduced, the wavelength division multiplexing technology is adopted, the simultaneous use of multiple users is realized, the multiple users are independently connected, the guidance accuracy is improved, and the LED indication end is adopted for guidance, so that the continuity is improved.
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic view of an indoor guidance system according to an embodiment of the present invention, where fig. 1 is a schematic view of a structure of an indoor guidance system according to the present invention; the details are as follows:
the present embodiment provides an indoor guidance system, which is used to implement the steps of the indoor guidance method of the present invention, and a visible light guidance system of the present invention includes: the system comprises a central control end, a user end and an LED indicating end.
The central control end comprises: the system comprises a database module, a coordination module, a first Wifi module, a first visible light communication module, a sensing module and a lens module, wherein the coordination module is connected with the database module, the first visible light communication module, the first Wifi module, the sensing module and the lens module respectively. The number of the central control terminals is small, and the number of the central control terminals is equivalent to that of the indoor lighting devices.
Wherein the coordination module: calling a color corresponding to a destination room predetermined by a user in the database module, namely color x; and allocating one filter color information, namely y, to the filter module at the user side. The color x is respectively sent to the user side and the indicating lamp group side through the first visible light communication module and the first Wifi module, the filter color y is sent to the user side through the first visible light communication module and is also used for matching users, whether user registration information exists in the database or not is judged in the user registration process, and a registration success or failure result is fed back.
A database module: for storing information, including user ID, start time t 1 End time t 2 Destination room number N, destination room assignment color x, the meaning of the information stored by the module is, at t 1 To t 2 During this time, the user, labeled ID, should be directed to the destination, in the process, the color assigned to the user's view is x.
The first visible light communication module is composed of a visible light transmission lamp group and a photoelectric detector, wherein the visible light transmission lamp group is at least composed of red, green and blue LED chips, can respectively emit red, green and blue wavelengths, and is synthesized into white light to realize wavelength division multiplexing; preferably, the visible light transmission lamp group is composed of four LED chips of red, green, blue and amber, and can emit four wavelengths of red, green, blue and amber respectively, and synthesize the four wavelengths into white light to realize wavelength division multiplexing.
A first Wifi module: the device is used for sending and receiving information and is mainly used for communicating with the indicating lamp group end.
The sensing module: the coordination module is used for detecting whether a human body moves or not and feeding back information to the coordination module.
A lens module: the LED array is used for adjusting the distance between the lens and the LED array and controlling the signal coverage.
When a sensing module is used for detecting that a user exists in a system coverage area, the central control end controls the LED indicating module to be on, and shortens the distance from the lens module to the first visible light communication module, so that the coverage range of a light spot emitted by the first visible light communication module is enlarged, the duration of a light spot enlarging state is equal to the diameter of the light spot divided by the preset user moving speed, and after the duration is over, the distance from the lens module to the first visible light communication module is increased, and the original light spot size is recovered.
And the central control end controls the LED indicating module to turn off when the sensing module detects that no user exists in the system coverage area.
The user side comprises a second visible light communication module, a filter module, a display module and a registration module, and the second visible light communication module is connected with the filter module, the display module and the registration module respectively. The number of the user terminals is large, and the number of the user terminals is equivalent to the number of the users.
The second visible light communication module: the LED visible light communication module is composed of an LED array and a photoelectric detector, is used for sending information and receiving information, and is mainly used for communicating with the first visible light communication module.
A filter module: and the second visible light communication module is used for receiving the filter color information, namely y, distributed by the transmitting terminal coordination module, and switching the filter, so that the filter with the color of y shields the photoelectric detector, and filters components with other wavelengths. The filter module is composed of at least three color filters of red, green and blue, preferably, the filter module is composed of four color filters of red, green, blue and amber, the filter module switches the filter in a rotating mode according to the wavelength allocated by the central control end, the second visible light communication module is shielded by the filter with a specific color, and the wavelength division multiplexing signals, the multiplexing signals combining wavelength division multiplexing and time division multiplexing, the multiplexing signals combining wavelength division multiplexing and frequency division multiplexing, and the multiplexing signals combining wavelength division multiplexing and code division multiplexing are filtered and demodulated.
A registration module: the second visible light communication module is used for collecting the user ID, realizing user registration and logout and sending the user information to the transmitting terminal through the second visible light communication module.
A display module: the second visible light communication module is used for receiving the user information matching condition generated by the transmitting terminal database module; for receiving the color information called by the transmitting end coordination module from the database module, i.e. color x, through the second visible light communication module. The display module informs the user whether the registration is successful, and the color x is displayed to the user in the guiding process for guiding the user. The display mode of the display module preferably adopts screen display and can also adopt a voice guide mode.
The LED indicating terminal comprises a second Wifi module, an indicating control module and an LED indicating module, wherein the second Wifi module is connected with the indicating control module, and the indicating control module is connected with the LED indicating module. The indicating lamp group end extends all over the indoor wall surface.
A second Wifi module: the method is used for sending and receiving information and is mainly used for communicating with a transmitting terminal.
An indication control module: and the second Wifi module is used for receiving the color information called from the database module by the transmitting terminal coordination module, namely the color x, and controlling the color and the arrangement mode of the lighting of the LED indicating module.
LED indication module: the system is used for receiving instructions for indicating the control module, lightening required lights and is generally arranged on the two side walls of the corridor. The LED indicating module is composed of a strip-shaped LED array, displayed light is in an arrow indicating mode and indicates the advancing direction of a user, the LED indicating module is used for guiding the user needing to pass through the section of the route, the color of the light is circularly lightened according to the period, and the circularly lightened color is the color distributed to all the users passing through the section of the route.
The LED indicating end is composed of a plurality of strip-shaped LED arrays, displayed light is presented by any one of arrows, dynamic walking pictures or English characters, and the colors of rooms corresponding to successfully matched users are lightened in a circulating mode.
The transmitting terminal and the indicating terminal are communicated through a first Wifi module and a second Wifi module, and a bidirectional communication link is established between the first Wifi module and the second Wifi module through a Wifi technology;
the transmitting terminal and the receiving terminal are communicated through the first visible light communication module and the second visible light communication module, and a two-way communication link is established between the first visible light communication module and the second visible light communication module through a visible light communication technology.
The embodiment specifically describes the connection relationship among specific structures of the visible light guide system and the functions of each structure, the invention uses indoor places with a plurality of rooms such as offline large conferences, hospitals, hotels, cinemas and the like, guides users to accurate rooms through the LED lamps, and implements accurate and precise guidance.
Referring to fig. 2, fig. 2 is a flowchart illustrating an indoor guiding method according to a first embodiment of the present invention; the method is applied to a visible light transmission central control end installed in a lighting system, and comprises the following specific operation steps:
step S201: receiving user information sent by a plurality of user terminals, and judging whether each user information is successfully matched;
and if the user information is not successfully matched, prompting that the user side is not successfully registered.
Step S202: calling the room color corresponding to the successfully matched user information according to the number of the successfully matched user sides and the user information;
step S203: based on the number of the successfully matched user terminals, selecting different transmission modes to transmit the room color distribution corresponding to the successfully matched user information to the successfully matched user terminals, wherein the different transmission modes comprise a wavelength division multiplexing technology, a multiplexing technology combining wavelength division multiplexing and time division multiplexing, a multiplexing technology combining wavelength division multiplexing and frequency division multiplexing, and a multiplexing technology combining wavelength division multiplexing and code division multiplexing;
judging whether the number of the successfully matched user sides is less than or equal to the number of the LED chips in the visible light transmission lamp group of the central control end;
when the number of the successfully matched user terminals is less than or equal to the number of the LED chips in the visible light transmission lamp group, transmitting the room color corresponding to the successfully matched user information to the successfully matched user terminals by using a wavelength division multiplexing technology;
and when the number of the successfully matched user terminals is larger than the number of the LED chips in the visible light transmission lamp group, transmitting the room color corresponding to the successfully matched user information to the successfully matched user terminals by utilizing any one of a multiplexing technology combining wavelength division multiplexing and time division multiplexing, a multiplexing technology combining wavelength division multiplexing and frequency division multiplexing and a multiplexing technology combining wavelength division multiplexing and code division multiplexing.
Step S204: sending the room colors corresponding to all the successfully matched user information to an LED indicating end, and controlling the LED indicating end to guide;
step S205: and if the user information is not successfully matched, prompting that the user side is not successfully registered.
In the embodiment, whether the user information is successfully matched is judged, a matching mechanism is added, independent connection of a guiding system is guaranteed, the guiding system is not interfered by the outside, then the colors of rooms are matched according to the user information, when multiple users are simultaneously used by utilizing a wavelength division multiplexing technology, information can be accurately transmitted to each user, independent connection among all the users is guaranteed, and guiding efficiency is improved.
Based on the above embodiment, this embodiment will describe in detail the transmission in step S203 in the above embodiment by selecting different transmission modes: referring to fig. 3, fig. 3 is a flowchart illustrating an indoor guiding method according to a second embodiment of the present invention; the method is applied to a visible light transmission central control end installed in a lighting system, and comprises the following specific operation steps:
step S301: initializing data, and storing colors corresponding to all rooms and all user information;
initializing a system: and the database module counts the number P of all destination rooms predetermined by all users, P colors are stored in the color library, and each destination room is allocated with one color x for the coordination module to select. The database module sorts the user preset information according to time sequence, when the user registers, the earliest preset time is used as the user registration time and the receiving end start working time
Step S302: receiving user information sent by a user side, and judging whether the user information is successfully matched;
user registration: the user registers through a registration module of the receiving end, the second visible light communication module sends the registration information representing the user ID to the first visible light communication module, the coordination module takes the user ID out of the first visible light communication module, information searching and matching are conducted through the database module, and the user registration condition is sent to the receiving end through the first visible light communication module. The user can know whether the registration is successful or not through the display module.
The specific situation is as follows: if the coordination module finds the preset information corresponding to the user ID, the registration success information is sent to the second visible light communication module through the first visible light communication module, the display module of the receiving end displays that the user registration is successful, and the receiving end is activated successfully; if the information in the data module is not successfully matched, the user registration is not passed, the first visible light communication module sends the registration unsuccessful information to the second visible light communication module, and the display module of the receiving end displays that the registration is not successful and the receiving end cannot be activated.
Step S303: judging whether the number of the successfully matched user sides is less than or equal to the number of the LED chips in the visible light transmission lamp group;
step S304: when the number of the successfully matched user terminals is less than or equal to the number of the LED chips in the visible light transmission lamp group, transmitting the room color corresponding to each successfully matched user information to the corresponding user terminal by adopting a wavelength division multiplexing technology;
step S305: when the number of successfully matched user terminals is larger than the number of LED chips in the visible light transmission lamp group, the user terminals are distributed and transmitted to the successfully matched user terminals by utilizing a multiplexing technology combining wavelength division multiplexing and time division multiplexing;
calculating to obtain the number of time slots according to the number of the successfully matched user sides and the number of the LED chips in the visible light transmission lamp group, wherein the number of the time slots is (the number of the user sides/the number of the visible light transmission lamp groups) + 1;
dividing all successfully matched user terminals into a plurality of time slots and wavelength groups according to the visible light transmission lamp groups and the number of the time slots;
and transmitting the room color corresponding to each successfully matched user information to the corresponding successfully matched user terminal according to the time slot and the wavelength grouping of the user terminal.
Step S306: when the number of successfully matched user terminals is larger than the number of LED chips in the visible light transmission lamp group, the user terminals are distributed and transmitted to the successfully matched user terminals by utilizing a multiplexing technology combining wavelength division multiplexing and frequency division multiplexing;
calculating to obtain the number of frequencies according to the number of the successfully matched user terminals and the number of the LED chips in the visible light transmission lamp group, wherein the number of the frequencies is (the number of the user terminals/the number of the visible light transmission lamp groups) + 1;
dividing all the successfully matched user terminals into a plurality of frequency and wavelength groups according to the visible light transmission lamp groups and the number of the frequencies;
and transmitting the room color corresponding to each successfully matched user information to the corresponding successfully matched user terminal according to the frequency and wavelength groups of the user terminal.
Step S307: when the number of successfully matched user terminals is larger than the number of LED chips in the visible light transmission lamp group, the user terminals are distributed and transmitted to the successfully matched user terminals by utilizing a multiplexing technology combining wavelength division multiplexing and code division multiplexing;
calculating according to the successfully matched user side number and the number of LED chips in the visible light transmission lamp group to obtain a code word number, wherein the code word number is (the user side number/the number of the visible light transmission lamp group) + 1;
dividing all the successfully matched user terminals into a plurality of code words and wavelength groups according to the visible light transmission lamp groups and the number of the code words;
and transmitting the room color corresponding to each successfully matched user information to the corresponding successfully matched user terminal according to the code word and the wavelength group of the user terminal.
Step S308: sending the room color corresponding to all successfully matched user information to an LED indicating end, and controlling the LED indicating end to guide;
after the user passes the registration, the coordination module selects a color x corresponding to a destination room of the user from the color library (note that the color x is specified by the database module in the system initialization process and represents a specific destination room), the first visible light communication module sends the color x to the second visible light communication module, and the first Wifi module sends the color x to the Wifi module 2. At the moment, the LED indicating module at the indicating end lights a lamp with the color of x, and the display module at the receiving end displays the color of x to a user; the coordination module distributes filter color information, namely y, to the filter module of the receiving end, the first visible light communication module sends the filter color y to the second visible light communication module, and the filter module of the receiving end is switched into a filter with the color being y at the moment and is used for shielding the light injection photoelectric detector.
In the above process, in order to transmit specific information of color x to multiple users, that is, to a certain user, which color x is, the first visible light communication module transmits different color information x to different users through time division multiplexing, frequency division multiplexing, or code division multiplexing.
1) Process of transmitting end to receiving end assigning color x: assuming that the total number of destination rooms is N, there are T slots, F frequencies, and C codewords. Let Z users be shared, let a be Z/4 (quotient), b be (Z ≡ 4) (remainder), let T be a +1, F be a +1, and C be a + 1.
When a is 0, transmitting color information by adopting a wavelength division multiplexing technology, and b is the number of filter colors y required by the filter module; when a is equal to 1 and b is equal to 0, the wavelength division multiplexing technology is adopted to transmit the color information, and at the moment, 4 filters of the filter module need to be used; when a and b are other cases, the multiplexing technology of wavelength division multiplexing and time division multiplexing, or wavelength division multiplexing and frequency division multiplexing, or wavelength division multiplexing and code division multiplexing is needed. For example, if Z is 10 users, a is 2 and b is 2.
a) If the multiplexing technique combining wavelength division multiplexing and time division multiplexing is adopted, the number of time slots T is 3, and T is the number of time slots T 1 、t 2 、t 3 For the 10 users, the first visible light communication module adopts the color y 1 Is in time slot t 1 Assigning color information to user 1, using the color y 2 Is in time slot t 1 Assigning color information to user 2, using the color y 3 Is in time slot t 1 Assigning color information to the user 3, using the color y 4 Is in time slot t 1 Assigning color information to the user 4, taking the color y 1 In time slot t 2 Assigning color information to the user 5, with the color y 2 Is in time slot t 2 Assigning color information to the user 6, with the color y 3 Is in time slot t 2 Assigning color information to the user 7, taking the color y 4 Is in time slot t 2 Assigning color information to the user 8, using the color y 1 Is in time slot t 3 Assigning color information to the user 9, using the color y 2 Is in time slot t 3 Color information is assigned to the user 10.
b) If a multiplexing technique combining wavelength division multiplexing and frequency division multiplexing is adopted, the number of frequencies F is 3, and F is the number of frequencies F 1 、f 2 、f 3 For the 10 users, the first visible light communication module adopts the color y 1 At a frequency f 1 Assign color information to user 1, using a chip with color y2 at frequency f 1 Assigning color information to user 2, using the color y 3 Is assigned color information to user 3 at frequency f1, using the color y 4 At a frequency f 1 Assigning color information to the user 4, taking the color y 1 At a frequency f 2 Assigning color information to the user 5, using the color y 2 At a frequency f 2 Assigning color information to the user 6, using the color y 3 At a frequency f 2 Assigning color information to the user 7, taking the color y 4 At a frequency f 2 Assigning color information to the user 8, using the color y 1 At a frequency f 3 Assigning color information to the user 9, using the color y 2 At a frequency f 3 Color information is assigned to the user 10.
c) If the multiplexing technology combining wavelength division multiplexing and code division multiplexing is adopted, the number of the code words C is 3, and C is respectively 1 、c 2 、c 3 For the 10 users, the first visible light communication module adopts the color y 1 With code word c 1 Assigning color information to user 1, using the color y 2 With code word c 1 Assigning color information to user 2, using the color y 3 With code word c 1 Assigning color information to the user 3, using the color y 4 With code word c 1 Assigning color information to the user 4, taking the color y 1 With code word c 2 Assigning color information to the user 5, using the color y 2 With code word c 2 Assigning color information to the user 6, using the color y 3 With code word c 2 Assigning color information to the user 7, taking the color y 4 With code word c 2 Assigning color information to the user 8, using the color y 1 With code word c 3 Assigning color information to the user 9, using the color y 2 With code word c 3 Color information is assigned to the user 10.
2) Process of assigning color x to the indicating end by the emitting end: the first Wifi module sends the color information x to the indicating end, and an indicating control module of the indicating end controls the LED indicating module to add the color x to the color circulation sequence. For example, assuming that the original 3 destination rooms need guidance, the LED indicates the color of the light of the module as x 1 、x 2 、x 3 For a set of cycles, a new destination room exists that needs guidance, assuming that the new destination room corresponds to a color x 4 Then the color x 4 Added to a color cycling sequence, i.e. the color of the light of the LED indicating module is indicated by x 1 、x 2 、x 3 、x 4 Is a set of cycles.
Step S309: judging whether other preset information exists in the user information which is successfully matched currently;
the storage information in the database module includes a predetermined destination roomStart time t of inter-use 1 And an end time t 2 At t, at 1 To t 2 And guiding all the lights of the preset destination rooms to be lighted in the period of time in a complete cycle as described in the color distribution step. After the end of the time period, i.e. at time t 2 The database module will continue to query for the user ID. If the inquiry finds that the user ID does not have the preset information of the next time period, the receiving end to which the user belongs is cancelled; if the user ID is inquired and found to have the preset information of the next time period, the preset information of the user in the next time period is sent to the coordination module, and the coordination module restarts a new color distribution and guidance according to the color distribution step.
In the above process, when the time is t 2 When t is deleted, the database module will delete t 1 To t 2 Subscriber reservation information within a time period, i.e. deletion start time t 1 End time t 2 A destination room number N, a destination room allocation color x, and user reservation information of the next time period, i.e. a start time t 3 End time t 4 Destination room number N ', new destination room corresponding color x' is sent to the coordination module.
Step S310: if the current user information contains the other preset information, recalling a new room color corresponding to the current user information according to the other preset information, and transmitting the new room color to the current user side for displaying;
1) coordinating module color reallocation process: the coordination module calls a color x ' corresponding to a new destination room from the color library, the first visible light communication module sends the color x ' to the second visible light communication module, and the first Wifi module sends the color x ' to the second Wifi module. After receiving the updated color information x ' from the transmitting end, the indication control module of the indicating end controls the LED indication module to light a lamp with the color of x ', and the display module of the receiving end displays the color x ' to a user; meanwhile, the coordination module distributes new filter color information, namely y ', to the filter module at the receiving end, the first visible light communication module sends the filter color y ' to the second visible light communication module, and at the moment, the filter module at the receiving end is switched into a filter with the color of y ' and is used for shielding the photoelectric detector.
2) Process of emitting end to indicating end assigning color x': the first Wifi module sends the color information x 'to the indicating end, and an indicating control module of the indicating end controls the LED indicating module to add the color x' to the color circulating sequence. For example, assuming that the original 4 destination rooms need guidance, the LED indicates the color of the light of the module as x 1 、x 2 、x 3 、x 4 For a set of cycles, the existing 1 destination room is finished with use, and 1 new destination room needs guidance. Suppose that the color of the destination room for which use ends is x 4 The color of the new destination room is x 5 Then the indication control module of the indication end sends the color x 4 Delete from the color rotation sequence and put color x 5 Added to a color cycling sequence, i.e. the color of the light of the LED indicating module is indicated by x 1 、x 2 、x 3 、x 5 A new set of cycles.
Step S311: and if the user information which is successfully matched currently does not contain the other preset information, the user information which is successfully matched currently is logged out.
After the user finishes all the guide strokes, the registration module is used, the database module is informed to verify the identity through the first visible light communication module and the second visible light communication module, all the preset information of the user ID is cancelled, and the receiving end returns to the initial state. When the destination room is not reserved by any user, the database module informs the coordination module to withdraw the color x corresponding to the destination room, namely, the coordination module informs the indicating end to delete the color x in the color cycle sequence of the LED indicating module, and simultaneously, the coordination module informs the receiving end to not display the color x any more.
In this embodiment, the guidance method and the practical use of the present invention will be described in detail using specific room numbers and specific numbers of people, and the effects of the present invention are as follows, compared with the prior art: the invention is suitable for indoor scenes with a plurality of rooms, such as off-line large conferences, hospitals, hotels, cinemas and the like, guides a user to accurately arrive at a destination room through LED light, and can effectively reduce the time for searching the destination room. The invention utilizes the indication end installed on the wall to guide the user to reach the destination room, and the virtual mobile phone simulates the route and converts the route into the real continuous route guidance, thereby solving the problem that part of the user is difficult to understand and follows the virtual route. The invention sets the route according to the existing room, has simple structure, is convenient and efficient, and can effectively avoid the problems of inaccurate positioning, signal interference, signal delay and the like of the traditional indoor navigation system. The invention can flexibly guide according to the indoor environment, has long service life, can support the simultaneous guide of a plurality of destination rooms, and can dynamically change the guide information at any time. The invention adopts the multiplexing technology of combining wavelength division multiplexing with time division multiplexing, or combining wavelength division multiplexing with frequency division multiplexing, or combining wavelength division multiplexing with code division multiplexing in the visible light communication technology to transmit color information to multiple users, thereby increasing the number of users and not generating the interference among the users.
To evaluate the proposed visible light guidance system and method, we consider a specific conference scenario. Suppose there are eight conferences, respectively A, B, C, D, E, F, G, H, and five conference rooms, respectively room 101, room 102, room 103, room 104, and room 105. The existing users A, B, C, D and E have conferences, and the conference schedule is shown in table 1.
TABLE 1
Figure BDA0003608683290000181
Firstly, all participants register users through the receiving end, and can enter the conference center after the display module of the receiving end displays that the user registration is successful. If the display module displays that the registration fails, the display module indicates that the database module does not have the user ID information, belongs to an external visitor and cannot enter the conference center.
Due to the fact that at t 1 To t 2 A total of five rooms (room 101, room 102, room 103, room 104, and room 105) are scheduled in the time period, and the mode is coordinatedThe block selects five colors corresponding to the five rooms from the color library, and the five colors respectively correspond to the rooms 101 and x 1 Yellow, room 102 corresponds to x 2 Green, room 103 corresponds to x 3 Red, room 104 corresponds to x 4 Blue, room 105 corresponds to x 5 Purple color. Transmitting end first visible light communication module transmits color x 1 Sending color x to a second visible light communication module at the first receiving end of the user 2 A second visible light communication module to the receiving end of the user B, sending the color x 3 A second visible light communication module to the user C receiving end for sending color x 4 A second visible light communication module to the receiving end of the user, sending the color x 5 And the second visible light communication module is arranged at the receiving end of the user E. The first Wifi module sends color x 1 、x 2 、x 3 、x 4 、x 5 To Wifi module 2. At the moment, the LED indicating module at the indicating end lights up with the color x 1 、x 2 、x 3 、x 4 、x 5 The display module at the receiving end of the user A displays the color x1, and the display module at the receiving end of the user B displays the color x 2 The display module at the receiving end of the user C displays the color x3, and the display module at the receiving end of the user D displays the color x 4 And the display module at the receiving end of the user E displays the color x 5 。
1) The specific process of the transmitting end distributing the color x to each user receiving end is as follows: here, since there are 5 users, that is, Z is 5, a is 1, and b is 1, the color information x is allocated by a multiplexing technique combining wavelength division multiplexing and time division multiplexing, or combining wavelength division multiplexing and frequency division multiplexing, or combining wavelength division multiplexing and code division multiplexing. Here, the color information x is allocated by combining wavelength division multiplexing and time division multiplexing, and the number of time slots T +1 + 2, which are T 1 、t 2 For these 5 users, the first visible light communication module uses the color y 1 Red-colored chip in time slot t 1 Assigning color information x to user A 1 By the colour y 2 Green chip in time slot t 1 Assigning color information x to user B 2 By the colour y 3 Blue chip in time slot t 1 Assigning color information x to user C 3 By the colour y 4 Amber chip in time slot t 1 Assigning color information x to a user 4 By the colour y 1 The chip at time slot t2 assigns color information x to the user 5 。
2) The specific process of assigning the color x to the indicating end by the transmitting end is as follows: a first Wifi module of the transmitting terminal transmits the color information x 1 、x 2 、x 3 、x 4 、x 5 Sending the color data to an indicating end, and controlling an LED indicating module to display corresponding colors by an indicating control module, wherein at the moment, due to the fact that 5 users exist in total, the LED indicating module is used for indicating the color x 1 、x 2 、x 3 、x 4 、x 5 Cyclically lighting up for a set of periods.
3) The filter module specifically works: the filter module at the receiving end of the user A adopts the color of y 1 The filter lens at the receiving end of the user B shields the photoelectric detector, and the filter lens module at the receiving end of the user B adopts the color of y 2 The filter lens at the receiving end of the user C is used for shielding the photoelectric detector, and the color of the filter lens module at the receiving end of the user C is y 3 The filter lens at the receiving end of the user is used for shielding the photoelectric detector, and the filter lens module at the receiving end of the user adopts the color of y 4 The filter lens at the receiving end of the user is y in color 1 The filter of (2) shields the photodetector.
At the user side, a receiving end display module of the user A informs the user A that the following color is x in a screen display mode 1 The indicator lamp of (1), find the destination room 101; the receiving end display module of the user B informs the user B that the following color is x in a screen display mode 2 Looking for the destination room 102; the receiving end display module of the user C informs the user that the C following color is x in a screen display mode 3 The indicator lamp of (2), find the destination room 103; the receiving end display module of the user D informs the user D that the following color is x in a screen display mode 4 To find the destination room 104; the receiving end display module of the user E informs the user that the E-leaf-following color is x in a screen display mode 5 The indicator lamp is used for searching a destination roomAnd (3) a chamber 105.
t 2 After the moment is finished, the database module continuously inquires the user ID, and finds that the users A, C and D have the scheduled meeting information next, and the users B and E have finished all the meeting processes. The database module will delete t 1 To t 2 The scheduled information of users A, B, C, D and E in the time period, namely the deletion starting time t 1 End time t 2 Destination room numbers 101, 102, 103, 104, 105, destination room assignment color x 1 、x 2 、x 3 、x 4 、x 5 These are recorded, and t is 3 To t 4 User reservation information for a time period, i.e. starting time t 3 End time t 4 Destination room numbers 101, 102, 105, new destination room corresponding color x 1 、x 2 、x 5 And sending the data to a coordination module database module.
The coordination module selects three colors corresponding to the three rooms from the color library, wherein the three colors respectively correspond to the room 101 and the room x 1 Yellow, room 102 corresponds to x 2 Green, room 105 corresponds to x 5 Purple color. Transmitting end first visible light communication module transmits color x 1 A second visible light communication module to the user C receiving end for sending color x 2 A second visible light communication module to the user A receiving end, sending color x 5 And the second visible light communication module is arranged at the receiving end of the user. The first Wifi module sends color x 1 、x 2 、x 5 To Wifi module 2. At the moment, the LED indicating module at the indicating end circularly lights up with the color x 1 、x 2 、x 5 The display module at the receiving end of the user A displays color x 2 And the display module at the receiving end of the user C displays the color x 1 Display color x of display module at receiving end of user D 5 。
1) The specific process of reassigning the color x' from the transmitting end to each user receiving end is as follows: here, there are 3 users, i.e., Z is 3, a is 0 and b is 3, so that only the wavelength division multiplexing technique is needed to allocate the color information x'. For the 3 users, the first visible light communication module adopts the color y 1 Red-colored chips assign color information x to the user first 2 By the colour y 2 Green chip assigns color information x to user c 1 By the colour y 3 Blue chip assigns color information x to user D 5 。
2) The specific process of reassigning the color x' from the transmitting end to the indicating end is as follows: the original 5 destination rooms (room 101, room 102, room 103, room 104, room 105) need guidance, and the color of the light of the LED indication module is x 1 、x 2 、x 3 、x 4 、x 5 For a set of cycles, the existing 2 destination rooms (rooms 103, 104) are finished, and the color corresponding to room 103 is x 3 The color corresponding to the room 104 is x 4 Then the indication control module of the indication end sends the color x 3 、x 4 Deleted from the color-cycling sequence, i.e. the color of the light of the LED indicating module is indicated by x 1 、x 2 、x 5 A new set of cycles.
3) The switching process of the filter module at the receiving end is as follows: the filter module at the receiving end of the user A still adopts the color of y 1 The filter is used for shielding the photoelectric detector, and the color of the filter adopted by the filter module at the receiving end of the user C is y 3 Becomes y 2 The color of the filter adopted by the filter module at the receiving end of the user is y 4 Becomes y 3 。
At the user side, a receiving end display module of the user A informs the user A that the following color is x in a screen display mode 2 Looking for the destination room 102; the receiving end display module of the user C informs the user that the C following color is x in a screen display mode 1 The indicator lamp of (1), find the destination room 101; the receiving end display module of the user D informs the user D that the following color is x in a screen display mode 5 Looking for the destination room 105.
Furthermore, at t 2 After the moment is finished, the journey of the user B and the journey of the user C are finished completely, the registration module is used, the database module is informed to check the identity through the second visible light communication module and the first visible light communication module, and the users are cancelledAnd D, all the preset information of the ID is received, and the receiving end returns to the initial state. At this time, the rooms 103 and 104 are not predetermined by any user, and the database module notifies the coordination module to retrieve the color x corresponding to the two rooms 3 、x 4 That is, the coordination module notifies the indicating end to delete color x in the color cycle sequence of its LED indication module 3 、x 4 And simultaneously informing all receiving ends by the coordination module that the color x is not displayed any more 3 、x 4 。
After the time t4, the users A, C and D log out in the above-mentioned note mode. The color information assigned to the rooms 101, 102, 105 is also retrieved as described above.
To evaluate the proposed visible light guiding system and method, we also explored the process of spot change in an actual scene where users are present and away, as shown in fig. 4.
When a sensing module of the central control end detects that a user exists in a system coverage area, the sensing module sends information to a coordination module, the coordination module sends working information to a second Wifi module through a first Wifi module, and an indication control module controls an LED indication module to be turned on; meanwhile, the coordination module sends information to the lens module, the distance from the lens module to the first visible light communication module is shortened, so that the coverage range of light spots sent by the first visible light communication module is enlarged, the duration of a light spot enlargement state is equal to the diameter of the light spots divided by the preset user moving speed, and after the duration is over, the distance from the lens module to the first visible light communication module is increased, and the original light spot size is recovered;
when a sensing module of the central control end detects that no user exists in a system coverage area, the sensing module sends information to the coordination module, the coordination module sends working information to the second Wifi module through the first Wifi module, and the indication control module controls the LED indication module to be turned off.
The specific distance adjustment method is as follows:
assuming that the preset user moving speed is v, the distance from the lens module to the first visible light communication module in the initial state is d 1 The first visible light communication module has an emitting diameter D 1 The coverage of the spot. The existing user A and the user B enter the system coverage area in sequence. When the sensing module of the central control end detects that a user A exists in the system coverage area (namely, the coverage area of a light spot with the diameter of D1 emitted by the first visible light communication module), the coordination module sends information to the lens module, and the distance between the lens module and the first visible light communication module is shortened to D 2 Thereby enlarging the emitting diameter of the first visible light communication module to D 2 The duration t of the spot-enlarging state is D 2 And v, after the duration of n time, increasing the distance from the lens module to the first visible light communication module to be d 1 Recovering the original light spot size;
in the duration, the user A leaves the system coverage area and enters the coverage area of the adjacent system, and the adjacent system carries out the steps;
when the light spot is in an expanded state, the system coverage area and the adjacent system coverage area have a part of overlapping part;
if the user B enters the system coverage area within the light spot expansion state n time range, namely the sensing module of the central control end detects that the user B exists in the system coverage area within the n time range, the coordination module sends information to the lens module, and the distance between the lens module and the first visible light communication module is kept as d 2 So as to keep the emitting diameter of the first visible light communication module at D 2 The duration t of the spot-enlarging state is D 2 After t time, increasing the distance d from the lens module to the first visible light communication module 1 Recovering the original light spot size;
if the user B enters the system coverage area after the light spot expansion state for n time, namely the sensing module of the central control end detects that the user B exists in the system coverage area after t time, the coordination module sends information to the lens module, and the steps are carried out according to the step of the lens module when the user A enters the system coverage area;
when the sensing module of the central control end detects that no user exists in the system coverage area, namely the user A and the user B leave the system coverage area, the central control end controls the LED indicating module to be turned off.
For example: presetting a user moving speed v as 1m/s, and a distance d from the lens module to the first visible light communication module in an initial state 1 Is 3cm, the coverage area of the signal sent by the first visible light communication module is the diameter D 1 A 3m light spot, and the sensing module at the central control end detects the system coverage area (i.e. the first visible light communication module emits light with a diameter D) 1 Within the coverage of the light spot) of the user a, the coordination module sends information to the lens module, and the distance d from the lens module to the first visible light communication module is shortened 2 Is 1cm, thereby expanding the signal range emitted by the first visible light communication module to have a diameter D 2 For a spot of 6m, the duration t of the spot enlargement state is D 2 After 6 seconds, increasing the distance from the lens module to the first visible light communication module to be 3cm, and recovering the original light spot size;
in 6 seconds, the system continues to guide according to the steps whether the user A leaves the coverage area of the system or not;
if the user B enters the system coverage area within 6 seconds in the light spot expansion state, the coordination module sends information to the lens module, the distance from the lens module to the first visible light communication module is kept to be 1cm, and therefore the signal range sent by the first visible light communication module is kept to be D in diameter 2 The light spot is 6m, the duration time n of the light spot expansion state is 6s, after 6 seconds, the distance from the lens module to the first visible light communication module is increased to be 3cm, and the original light spot size is recovered;
if the user B enters the system coverage area after 6 seconds, the coordination module sends information to the lens module, and the steps of the lens module are repeated when the user A enters the system coverage area;
when the sensing module of the central control end detects that no user exists in the system coverage area, namely the user A and the user B leave the system coverage area, the central control end controls the LED indicating module to be turned off.
The embodiment specifically describes the connection relationship among specific structures of the visible light guide system and the functions of each structure, the invention uses indoor places with a plurality of rooms such as offline large conferences, hospitals, hotels, cinemas and the like, guides users to accurate rooms through the LED lamps, and implements accurate and precise guidance.
The indoor guidance method and system provided by the invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, it is possible to make various improvements and modifications to the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims (10)

1. An indoor guiding method, which is applied to a visible light transmission central control end installed in a lighting system, comprises the following steps:
receiving user information sent by a plurality of user terminals, and judging whether each user information is successfully matched;
calling the room color corresponding to the successfully matched user information according to the number of the successfully matched user sides and the user information;
based on the number of the user sides which are successfully matched, selecting different transmission modes to distribute and transmit the room colors corresponding to the user information which is successfully matched to the user sides which are successfully matched, wherein the different transmission modes comprise a wavelength division multiplexing technology, a multiplexing technology combining wavelength division multiplexing and time division multiplexing, a multiplexing technology combining wavelength division multiplexing and frequency division multiplexing, and a multiplexing technology combining wavelength division multiplexing and code division multiplexing;
sending the room color corresponding to all successfully matched user information to an LED indicating end, and controlling the LED indicating end to guide;
and if the user information is not successfully matched, prompting that the user side is not successfully registered.
2. The indoor guiding method of claim 1, wherein the selecting different delivery methods to deliver the room color allocation corresponding to the successfully matched user information to the successfully matched user terminal based on the number of successfully matched user terminals comprises:
judging whether the number of the successfully matched user sides is less than or equal to the number of the LED chips in the visible light transmission lamp group of the visible light transmission central control end;
when the number of the successfully matched user terminals is less than or equal to the number of the LED chips in the visible light transmission lamp group, transmitting the room color corresponding to the successfully matched user information to the successfully matched user terminals by using a wavelength division multiplexing technology;
when the number of the successfully matched user terminals is larger than that of the LED chips in the visible light transmission lamp group, any one of a multiplexing technology combining wavelength division multiplexing and time division multiplexing, a multiplexing technology combining wavelength division multiplexing and frequency division multiplexing, and a multiplexing technology combining wavelength division multiplexing and code division multiplexing is used for transmitting the room color corresponding to the successfully matched user information to the successfully matched user terminals;
the number of the LED chips in the visible light transmission lamp group is more than or equal to 3.
3. The indoor guiding method as claimed in claim 2, wherein the transmitting the room color corresponding to the successfully matched user information to the successfully matched user terminal by using a multiplexing technique combining wavelength division multiplexing and time division multiplexing comprises:
calculating the number of time slots according to the number of the successfully matched user sides and the number of the LED chips in the visible light transmission lamp group, wherein the number of the time slots is (the number of the user sides/the number of the LED chips in the visible light transmission lamp group) + 1;
dividing all successfully matched user terminals into a plurality of time slots and wavelength groups according to the number of the LED chips in the visible light transmission lamp group and the number of the time slots;
and transmitting the room color corresponding to each successfully matched user information to the corresponding successfully matched user terminal according to the time slot and the wavelength grouping of the user terminal.
4. The indoor guiding method of claim 2, wherein the multiplexing technique of wavelength division multiplexing and frequency division multiplexing to transmit the room color corresponding to the successfully matched user information to the successfully matched user terminal comprises:
calculating to obtain the number of frequencies according to the number of the successfully matched user sides and the number of the LED chips in the visible light transmission lamp group, wherein the number of the frequencies is (the number of the user sides/the number of the LED chips in the visible light transmission lamp group) + 1;
dividing all the successfully matched user terminals into a plurality of frequency and wavelength groups according to the number of the LED chips in the visible light transmission lamp group and the number of the frequencies;
and transmitting the room color corresponding to each successfully matched user information to the corresponding successfully matched user terminal according to the frequency and wavelength groups of the user terminal.
5. The indoor guiding method of claim 2, wherein the transmitting the room color corresponding to the successfully matched user information to the successfully matched user terminal by using a multiplexing technique combining wavelength division multiplexing and code division multiplexing comprises:
calculating according to the successfully matched user side number and the number of LED chips in the visible light transmission lamp group to obtain a code word number, wherein the code word number is (the user side number/the number of LED chips in the visible light transmission lamp group) + 1;
dividing all the successfully matched user terminals into a plurality of code words and wavelength groups according to the number of the LED chips and the number of the code words in the visible light transmission lamp group;
and transmitting the room color corresponding to each successfully matched user information to the corresponding successfully matched user terminal according to the code word and the wavelength group of the user terminal.
6. The indoor guiding method of claim 1, wherein the sending the room color corresponding to all the successfully matched user information to an LED indicating terminal and controlling the LED indicating terminal to direct comprises:
wirelessly transmitting the room colors corresponding to all successfully matched user information to the LED indicating end;
and controlling the LED indicating end to light the LED light with the same color as the room for guidance according to the successfully matched user information.
7. The indoor guiding method of claim 1, wherein the sending room colors corresponding to all successfully matched user information to an LED indication terminal and controlling the LED indication terminal to direct comprises:
judging whether each user information successfully matched contains other preset information, wherein the preset information comprises: the user identity, the preset starting time, the preset ending time, the preset room number and the color corresponding to the preset room;
if the user information which is successfully matched currently does not contain the other preset information, the user information which is successfully matched currently is cancelled;
if the current user information contains other preset information, sequencing the preset information according to the preset starting time, and recalling the color of a new room corresponding to the current user information;
and transmitting the new room color corresponding to the current user information to the user side corresponding to the current user information.
8. An indoor guidance system, comprising:
the central control end is installed in the lighting system and comprises: the system comprises a database module, a coordination module, a first Wifi module and a first visible light communication module, wherein the coordination module is respectively connected with the database module, the first visible light communication module and the first Wifi module, the central control end is used for receiving and matching user information sent by a plurality of user ends, the coordination module is used for calling room colors corresponding to the user information which is successfully matched, the room colors corresponding to the user information which is successfully matched are distributed and transmitted to the user ends which are successfully matched by adopting the technology of combining wavelength division multiplexing, time division multiplexing, frequency division multiplexing and code division multiplexing, and the room colors corresponding to all the user information which is successfully matched are wirelessly sent to an LED indicating end;
the user side is located the user side, includes: the second visible light communication module is respectively connected with the filter module, the display module and the registration module, and the user side is used for collecting user ID, switching the filter to filter components with other wavelengths and displaying the registration state of the user and the color of a room matched with the user; the filter module at least comprises a red filter, a green filter and a blue filter, and the filters are switched in a rotating mode according to the wavelength distributed by the central control end, so that the second visible light communication module is shielded by the filters with specific colors, and the wavelength division multiplexing signals and signals generated by other multiplexing modes are filtered and demodulated;
LED pilot end is located indoor corridor wall limit, includes: the second Wifi module is connected with the indication control module, the indication control module is connected with the LED indication module, and the LED indication terminal is used for receiving room colors corresponding to all successfully matched user information sent by the central control terminal and controlling the LED indication module to guide; the LED indicating module is composed of a plurality of strip-shaped LED arrays, displayed light is presented by any one of an arrow, a dynamic walking picture or English characters, and the colors of rooms corresponding to successfully matched users are circularly lightened;
the central control terminal and the LED indicating terminal are communicated through the first Wifi module and the second Wifi module, and a bidirectional communication link is established between the first Wifi module and the second Wifi module through a Wifi technology;
the central control end and the user end communicate through the first visible light communication module and the second visible light communication module, and a bidirectional communication link is established between the first visible light communication module and the second visible light communication module through a visible light communication technology.
9. The indoor guidance system of claim 8, wherein the central control end further comprises: the sensing module and the lens module are respectively connected with the coordination module;
the sensing module is used for detecting whether a user exists in the coverage range of the system;
the lens module is used for magnifying or reducing light spots irradiated by the first visible light communication module and increasing or reducing the coverage area of the system;
when the sensing module detects that a user exists in a system coverage area, the LED indicating module is controlled to be on, and the distance from the lens module to the first visible light communication module is shortened, so that the coverage range of a light spot emitted by the first visible light communication module is enlarged, the duration of a light spot enlargement state is equal to the diameter of the light spot divided by the preset user moving speed, and after the duration is over, the distance from the lens module to the first visible light communication module is increased, and the original light spot size is recovered;
and when the sensing module detects that no user exists in the system coverage area, the LED indicating module is controlled to be turned off.
10. The indoor guidance system of claim 8, wherein the first visible light communication module is composed of a visible light transmitting lamp group and a photodetector, wherein the visible light transmitting lamp group is composed of at least three LED chips of red, green, and blue;
the visible light transmission lamp set respectively emits red, green and blue wavelengths, and the three wavelengths are synthesized into white light, so that wavelength division multiplexing is realized and transmitted to the filter module.
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