CN103869284A - Visible light communication-based indoor positioning system and method - Google Patents

Visible light communication-based indoor positioning system and method Download PDF

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Publication number
CN103869284A
CN103869284A CN201410073770.9A CN201410073770A CN103869284A CN 103869284 A CN103869284 A CN 103869284A CN 201410073770 A CN201410073770 A CN 201410073770A CN 103869284 A CN103869284 A CN 103869284A
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CN
China
Prior art keywords
signal
visible light
electric signal
indoor
light communication
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Application number
CN201410073770.9A
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Chinese (zh)
Inventor
张民
韩大海
罗鹏飞
张翔
李青
李壮
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北京邮电大学
北京广厦网络技术股份公司
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Priority to CN201410073770.9A priority Critical patent/CN103869284A/en
Publication of CN103869284A publication Critical patent/CN103869284A/en

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S5/00Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/16Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using electromagnetic waves other than radio waves

Abstract

The invention discloses a visible light communication-based indoor positioning system and method which are designed for solving the problems of high hardware cost, more system maintenance expense and the like of the existing indoor positioning system and method. The visible light communication-based indoor positioning system comprises a transmitting terminal and a mobile receiving terminal; the transmitting terminal consists of a plurality of transmitters distributed at various places indoors; each transmitter comprises an LED (light-emitting diode) light source for using a photosignal to output the position information of the transmitter; the mobile receiving terminal is used for receiving the photosignal, transforming the photosignal into an electric signal and extracting the corresponding position information from the electric signal. The visible light communication-based indoor positioning method is used in the visible light communication-based indoor positioning system and comprises the steps that one LED light source uses one photosignal to output the position information of the LED light source; the mobile receiving terminal receives the photosignal, transforms the photosignal into the electric signal and extracts the corresponding position information from the electric signal. The visible light communication-based indoor positioning system and method have the advantages of low hardware cost, less system maintenance expense, high accuracy and the like.

Description

Indoor locating system based on visible light communication and method

Technical field

Visible light communication of the present invention field, relates in particular to a kind of indoor locating system and method based on visible light communication.

Background technology

GPS GPS has solved outdoor location, but the indoor positioning in the leisure office places such as market, Business Building is but due to the blocking of buildings, and not can solve.Existing indoor positioning system comprises:

Active Badge positioning system, based on indoor mark sensing prototype system, comes the position of estimating user according to method of approximation, only can be accurate to room therefore degree of accuracy is low;

Active Bat positioning system, Cricket and SpotON positioning system, a large amount of specialized equipment of indoor use that conventionally need to locate at needs, thus system cost is high, system maintenance expense is large.

Summary of the invention

(1) goal of the invention

The present invention aims to provide a kind of indoor locating system based on visible light communication and the method that degree of accuracy is high, system cost is low.

(2) technical scheme

For reaching above-mentioned purpose, the present invention is based on the indoor locating system of visible light communication, comprise transmitting terminal and mobile reception end;

Described transmitting terminal is distributed in indoor transmitter everywhere by several and forms;

Described transmitter comprises the LED light source in order to the positional information at transmitter place is outwards exported with light signal;

Described mobile reception end, in order to receive described light signal, to convert electric signal to and extract location information from electric signal.

Preferably,

Described transmitter also comprises the first signal processing unit in order to described positional information is converted to the modulation signal that can drive described LED light source.

Preferably,

Described mobile reception end comprises:

Photoelectric commutator, in order to receive described light signal and to convert electric signal to;

Secondary signal processing unit, in order to receive and demodulation described in electric signal to obtain positional information.

Preferably,

Described photoelectric commutator is solar cell;

Described solar cell, in order to receive described light signal, absorbs the luminous energy that described light signal carries and converts electric energy to and outwards export with voltage; The voltage of described solar cell output changes formation and modification voltage with the variation of described light signal and generates described electric signal;

Described secondary signal processing unit is the detuner being connected with described solar cell electricity, in order to the variation voltage of solar cell output described in reception demodulation.

Preferably,

Described first signal processing unit comprises DTMF dual-tone multifrequency modulator;

Described secondary signal processing unit comprises DTMF dual-tone multifrequency detuner.

Preferably, described LED light source is white LED light source.

For reaching above-mentioned purpose, the present invention is based on the indoor orientation method of visible light communication, it is characterized in that, the described indoor orientation method based on visible light communication, comprises the following steps:

Step M:LED light source is outwards exported the positional information at its place with light signal;

Step N: mobile reception end receiving optical signals also converts electric signal to, extract location information from electric signal.

Further, the described indoor orientation method based on visible light communication, further comprising the steps of:

Step M-1: described positional information is generated to the modulation signal of energy driving LED and outputs to described LED light source according to default modulator approach;

Described step N comprises the following steps:

Step N1: receiving optical signals, convert electric signal to and export described electric signal;

Step N2: receive described electric signal, according to electric signal described in the suitable default demodulation method demodulation of described default modulator approach to obtain positional information.

Further,

Described default modulator approach is DTMF dual-tone multifrequency modulator approach;

Described default demodulation method is DTMF dual-tone multifrequency demodulation method.

Further, described step N1 comprises following concrete steps:

Step N1.1: receive described light signal and absorb the entrained luminous energy of described light signal and outwards export with voltage;

Step N1.2: according to the variation output transform voltage of described light signal, generate described electric signal.

(3) the present invention is based on the indoor locating system of visible light communication and the beneficial effect of method

First: the indoor locating system and the method that the present invention is based on visible light communication, adopt visible light communication, LED light source is outwards broadcasted the position at himself place with light signal, mobile reception end is receiving the position that has obtained mobile reception end after processing by signal after visible ray, and positioning precision is up to 1m.

Second: the indoor locating system and the method that the present invention is based on visible light communication, adopt the building block of LED light source as the transmitting terminal for locating, described LED light source both can be for illumination or for local decorations such as markets, again for the communication of indoor positioning, need extra laying specialized equipment with respect to traditional Active Bat positioning system, Cricket and SpotON positioning system, saved the hardware cost of system, saved expense, safeguard that simply maintenance cost is low simultaneously.

Brief description of the drawings

Fig. 1 is the structural representation of the indoor locating system based on visible light communication described in the embodiment of the present invention two;

Fig. 2 is the structural representation of the indoor locating system based on visible light communication described in the embodiment of the present invention three;

Fig. 3 is the process flow diagram of the indoor orientation method based on visible light communication described in second embodiment of the invention.

Embodiment

Below in conjunction with Figure of description and embodiment, the indoor locating system that the present invention is based on visible light communication is described further.

Embodiment mono-:

Visible light communication be utilize visual inspection that white light or colored light light emitting diode etc. send less than the light signal of high speed light and shade flicker carry out transmission information, be one for the technology of indoor communications.

The indoor locating system of the present embodiment based on visible light communication, comprises transmitting terminal and mobile reception end;

Described transmitting terminal is distributed in indoor transmitter everywhere by several and forms;

Described transmitter comprises the LED light source in order to the positional information at transmitter place is outwards exported with light signal;

Described mobile reception end, in order to receive described light signal and to convert electric signal to and extract location information from electric signal.

In concrete use procedure, the positional information that LED light source transmits is as required with the outside output optical signal of flash signal.Described positional information can be to be stored in by coded modulation the information that is directly read and exported to LED light source by controller or control circuit in the middle of storer, also can be that input voltage or the electric current of directly directly controlling LED light source by logical circuit realized, implementation has multiple, and it is low to realize cost, and LED light source is widely used in the place of office and life.And mobile reception end can be the common mobile device such as mobile phone or panel computer or personal digital assistant, therefore the indoor locating system based on visible light communication described in the present embodiment has, enforcement is simple, implementation cost is low and degree of accuracy advantages of higher.

Embodiment bis-:

As shown in Figure 1, the present embodiment is the indoor locating system based on visible light communication, comprises transmitting terminal and mobile reception end;

Described transmitting terminal comprises that several are distributed in indoor transmitter everywhere; The number of transmitter and position as required and default positioning precision arrange;

Described transmitter comprises:

First signal processing unit, in order to generate the positional information at its place modulation signal the output of energy driving LED light source; As transmitting terminal is positioned at position A, first signal processing unit is by its position signalling---and position A is modulated into the discernible modulation signal of LED light source and outputs to connected LED light source according to default modulator approach;

LED light source, outwards exports in order to receive described modulation signal and to convert light signal to; LED light source is connected with described first signal processing unit, receives modulation signal and converts light signal to and outwards export, and is generally broadcast output; In diagram, dotted arrow representative is light signal;

Described mobile reception end comprises:

Photoelectric commutator, in order to receive described light signal and to convert electric signal to; Photoelectric commutator receiving optical signals also converts the electric signal such as voltage, electric current to and outwards exports.Mobile reception end is positioned at different position correspondences and different transmitting terminals, and photoelectric commutator is the positional information that receives the LED light source of this position and send with light signal, thus easy realization tracking and the location to mobile reception end position;

Secondary signal processing unit, in order to receive and demodulation described in electric signal to obtain positional information, adopt the default demodulation method suitable with default modulator approach, convert the electrical signal to positional information and outwards export, thereby user can obtain the positional information at its place.

The indoor locating system based on visible light communication described in the present embodiment, is a kind of brand-new positioning system with respect to traditional positioning system, and this system adopts visible ray information to position.Transmitting terminal is made up of first signal processing unit and LED light source, have simple in structure, the feature that equipment cost is low, in addition this LED light source is visible light source, can be used for room lighting and interior decoration, without the specialized equipment in the middle of traditional system, therefore further reduced the hardware cost of system.In addition checking repeatedly by experiment, the degree of accuracy of the indoor locating system based on visible light communication described in the present embodiment can be up to 1m, therefore have the advantages that degree of accuracy is high.

Embodiment tri-:

The indoor locating system of the present embodiment based on visible light communication, comprises transmitting terminal and mobile reception end;

Described transmitting terminal is distributed in indoor transmitter everywhere by several and forms;

Described transmitter comprises:

First signal processing unit, in order to generate the positional information at its place modulation signal the output of energy driving LED light source;

LED light source, outwards exports in order to receive described modulation signal and to convert light signal to;

Described mobile reception end comprises:

Photoelectric commutator, in order to receive described light signal and to convert electric signal to;

Secondary signal processing unit, in order to receive and demodulation described in electric signal to obtain positional information;

Described photoelectric commutator is solar cell; Described solar cell receives described light signal, absorbs the luminous energy that described light signal carries and converts electric energy to and outwards export with voltage, forms described electric signal according to the external exporting change voltage of the variation of described light signal;

Described secondary signal processing unit is the detuner being connected with described solar cell, in order to the variation voltage of solar cell output described in reception demodulation.

In the present embodiment further described photoelectric commutator tool is changed into solar cell, solar cell can receiving optical signals, and absorb the entrained luminous energy of light signal, the voltage amplitude of solar cell output changes with absorbed luminous energy Strength Changes,, the easy reception that has completed photosignal and conversion.In concrete implementation process, can also adopt other photoelectric conversion device, but adopt in the present embodiment solar cell, have that volume is little, conversion is accurately connected the advantages such as easy with other circuit,

Embodiment tetra-:

As shown in Figure 2, embodiment on the basis of above-mentioned arbitrary embodiment, the indoor locating system based on visible light communication described in the present embodiment, described first signal processing unit is DTMF dual-tone multifrequency modulator; Described secondary signal processing unit is DTMF dual-tone multifrequency detuner.In the process of visible light communication, the modulation system of signal has multiplely as OOK scale-of-two on off keying modulator approach and OFDM orthogonal frequency-division complex modulation method etc., and corresponding different modulator approach has different modulators and detuner; And preferred technology maturation in the present embodiment, modulator simple in structure, to modulate simple DTMF dual-tone multifrequency modulator and DTMF dual-tone multifrequency detuner.And DTMF is many because multifrequency modulator is widely used in electronic equipment, in the mobile devices such as mobile phone, panel computer, personal digital assistant, thereby the equipment that the mobile reception end described in native system is contained is many, and system forms simple.What wherein the waveform between LED light source and solar cell represented is light signal.

As further improvement of this embodiment, mobile reception end described in the present embodiment is mobile phone or panel computer, all built-in DTMF dual-tone multifrequency detuner in existing mobile phone and panel computer, again with described photoelectric commutator---solar cell is connected light signal the output position information that can receive LED light source transmitting, because solar cell is small and exquisite, be installed in mobile phone or panel computer easy, and mobile phone and panel computer are all the equipment generally using, therefore further simplified system, reduced the hardware cost of system.

Embodiment five:

The indoor locating system of the present embodiment based on visible light communication, comprises transmitting terminal and mobile reception end;

Described transmitting terminal comprises that several are distributed in indoor transmitter everywhere;

Described transmitter comprises:

First signal processing unit, in order to generate the positional information at its place modulation signal the output of energy driving LED light source;

LED light source, outwards exports in order to receive described modulation signal and to convert light signal to;

Described mobile reception end comprises:

Photoelectric commutator, in order to receive described light signal and to convert electric signal to;

Secondary signal processing unit, in order to receive and demodulation described in electric signal to obtain positional information; Described LED light source is white LED light source.

In concrete use procedure, the visible light source that described LED light source is random color, but the preferred white LED light source of the present embodiment, white LED light source good communication quality, and generally for illumination, in system laying and use cost, be all preferred version.

Below in conjunction with Figure of description and embodiment, the indoor orientation method that the present invention is based on visible light communication is described further.

The first embodiment:

The indoor orientation method of the present embodiment based on visible light communication, comprises the following steps:

Step M:LED light source is outwards exported the positional information at its place with light signal;

Step N: mobile reception end receiving optical signals also converts electric signal to, extract location information from electric signal.

The indoor orientation method of the present embodiment based on visible light communication, adopts visible light communication to carry out indoor location, and first a kind of method of brand-new indoor positioning is provided; Secondly, because the communication facilities in communication means is to have adopted the mobile reception end such as LED light source and widely used mobile phone and panel computer, it is low that historical facts or anecdotes is executed the method hardware cost, again, based on visible ray, therefore the indoor orientation method of the visible light communication described in the present embodiment, location granularity is less than room; In the process of experimental verification repeatedly, the precision of location will be up to 1m.

The second embodiment:

As shown in Figure 3, the indoor orientation method of the present embodiment based on visible light communication, for several transmitters that formed by first signal processing unit and LED light source with by between photoelectric commutator and the mobile reception end of secondary signal processing unit about the communicating by letter of indoor positioning, specifically comprise the following steps:

Step S1: the positional information at its place is generated to modulation signal the output of energy driving LED light source according to default modulator approach;

Step S2:LED light source receives described modulation signal, convert light signal to outwards exports;

Step S3: receiving optical signals, convert electric signal to and export described electric signal;

Step S4: receive described electric signal, according to electric signal described in the suitable default demodulation method demodulation of described default modulator approach to obtain positional information.

In concrete implementation process, described transmitting terminal is outside transmitting site information repeatedly, as LED light source is launched the light signal that carries positional information for 10 times within 1 second, with facilitate through mobile reception termination receive the positional information of this position, thereby realization that can be easy location.

The indoor orientation method based on visible light communication described in the present embodiment, the transmission and the location that are different from traditional localization method and realize positional information taking visible light communication as communication means, have and realize easyly, realizes cost low, positioning precision advantages of higher.

The 3rd embodiment:

The present embodiment, on the basis of a upper embodiment, is divided into two steps by described step S3 specific as follows:

Step S3.1: receive described light signal and absorb the entrained luminous energy of described light signal and outwards export with voltage;

Step S3.2: according to the variation output transform voltage of described light signal, generate described electric signal.In concrete implementation process, the conversion of photosignal has multiple, and in the present embodiment, employing method realizes easyly, realizes equipment cost low, and volume is little and compatible strong.

In addition, described light signal can make versicolor visible light signal, but preferred white light signal in the present embodiment, because white light signal is in the process of visible light communication, good communication quality, and white light is used for greatly illumination, use extensively, in concrete implementation process, facilities and equipments cost is low.

The 4th embodiment:

The indoor orientation method of the present embodiment based on visible light communication, for several transmitting terminals that formed by first signal processing unit and LED light source with by between photoelectric commutator and the mobile reception end of secondary signal processing unit about the communicating by letter of indoor positioning, specifically comprise the following steps:

Step S1: first signal processing unit generates the positional information at its place modulation signal the output of energy driving LED light source according to DTMF dual-tone multifrequency modulator approach; If first signal processing unit is by address information, the text messages such as No. 13 5th floors A districts, No. 11 street convert signal to through Signal coding, then convert corresponding frequency output to by DTMF dual-tone multifrequency modulator approach;

Step S2:LED light source receives described modulation signal, convert light signal to outwards exports; The frequency that LED light source is exported according to first signal processing unit, converts the blinking light output of different frequency to;

Step S3: photoelectric commutator receiving optical signals, convert electric signal to and export described electric signal; The light signal that photoelectric commutator receives according to it converts corresponding electric signal to, can be that voltage signal can be also current signal output;

Step S4: secondary signal processing unit receive described electric signal, according to electric signal described in the suitable DTMF dual-tone multifrequency demodulation method demodulation of described default modulator approach to obtain positional information.Secondary signal processing unit receives described electric signal, and by electric signal described in the demodulation of DTMF dual-tone multifrequency demodulation method, obtain the positional information after encoded, then obtain the readable positional information of final user by decoding, thereby can accurately locate the position at mobile reception end subscriber place.DTMF modulation, demodulation method technology maturation, realize easyly, in a large amount of mobile electronic devices that use, all can complete, thereby the localization method based on visible light communication described in the present embodiment is had advantages of promote convenient and use cost is low.

Above embodiment is only for illustrating the present invention; and be not limitation of the present invention; the those of ordinary skill in relevant technologies field; without departing from the spirit and scope of the present invention; can also make a variety of changes and modification; therefore all technical schemes that are equal to also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.

Claims (10)

1. the indoor locating system based on visible light communication, comprises transmitting terminal and mobile reception end; It is characterized in that,
Described transmitting terminal is distributed in indoor transmitter everywhere by several and forms;
Described transmitter comprises the LED light source in order to the positional information at transmitter place is outwards exported with light signal;
Described mobile reception end, in order to receive described light signal, to convert electric signal to and extract location information from electric signal.
2. the indoor locating system based on visible light communication according to claim 1, is characterized in that,
Described transmitter also comprises the first signal processing unit in order to described positional information is converted to the modulation signal that can drive described LED light source.
3. the indoor locating system based on visible light communication according to claim 2, is characterized in that,
Described mobile reception end comprises:
Photoelectric commutator, in order to receive described light signal and to convert electric signal to;
Secondary signal processing unit, in order to receive and demodulation described in electric signal to obtain positional information.
4. the indoor locating system based on visible light communication according to claim 3, is characterized in that,
Described photoelectric commutator is solar cell;
Described solar cell, in order to receive described light signal, absorbs the luminous energy that described light signal carries and converts electric energy to and outwards export with voltage; The voltage of described solar cell output changes formation and modification voltage with the variation of described light signal and generates described electric signal;
Described secondary signal processing unit is the detuner being connected with described solar cell electricity, in order to the variation voltage of solar cell output described in reception demodulation.
5. according to the system of the indoor positioning based on visible light communication described in claim 3 or 4, it is characterized in that,
Described first signal processing unit comprises DTMF dual-tone multifrequency modulator;
Described secondary signal processing unit comprises DTMF dual-tone multifrequency detuner.
6. according to the indoor status system based on visible light communication described in claim 1,2,3 or 4, it is characterized in that, described LED light source is white LED light source.
7. the indoor orientation method based on visible light communication, is characterized in that, the described indoor orientation method based on visible light communication comprises the following steps:
Step M:LED light source is outwards exported the positional information at its place with light signal;
Step N: mobile reception end receiving optical signals also converts electric signal to, extract location information from electric signal.
8. the indoor orientation method based on visible light communication according to claim 7, is characterized in that, the described indoor orientation method based on visible light communication is further comprising the steps of:
Step M-1: described positional information is generated to the modulation signal of energy driving LED light source and outputs to described LED light source according to default modulator approach;
Described step N comprises the following steps:
Step N1: receiving optical signals, convert electric signal to and export described electric signal;
Step N2: receive described electric signal, according to electric signal described in the suitable default demodulation method demodulation of described default modulator approach to obtain positional information.
9. the indoor orientation method based on visible light communication according to claim 8, is characterized in that,
Described default modulator approach is DTMF dual-tone multifrequency modulator approach;
Described default demodulation method is DTMF dual-tone multifrequency demodulation method.
10. according to the indoor orientation method based on visible light communication described in claim 7 or 8, it is characterized in that, described step N1 comprises following concrete steps:
Step N1.1: receive described light signal and absorb the entrained luminous energy of described light signal and outwards export with voltage;
Step N1.2: according to the variation output transform voltage of light signal, generate described electric signal.
CN201410073770.9A 2014-02-28 2014-02-28 Visible light communication-based indoor positioning system and method CN103869284A (en)

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Application publication date: 20140618