CN102215068A - Wireless automatic navigation system based on visible light communication - Google Patents
Wireless automatic navigation system based on visible light communication Download PDFInfo
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Abstract
The invention relates to an automatic navigation system, in particular to an automatic navigation system based on visible light communication, belonging to the technical field of multimedia information transmission and playing. According to the technical scheme provided by the invention, the wireless automatic navigation system based on visible light communication comprises a visible light transmitter and a mobile terminal with a photodiode, wherein the mobile terminal and the visible light transmitter can be connected in a visible light communication mode; the visible light transmitter transmits a visible light signal with identity identification information to the mobile terminal; the mobile terminal receives the visible light signal by the photodiode; and the mobile terminal outputs navigation information which is stored in the mobile terminal and corresponds to the identity identification information after the visible light signal is identified, conformed and matched. The wireless automatic navigation system has the functions of wirelessly positioning and automatically navigating, is convenient to install and use, lowers navigating and positioning cost, has the advantages of high positioning precision, strong antijamming capability, wide applicable range, and is energy-saving and environmentally-friendly, scientific, reasonable, safe and reliable.
Description
Technical field
The present invention relates to a kind of automatic guide system, especially a kind of automatic guide system, the technical field that belongs to the multimedia messages transmission and play based on visible light communication.
Background technology
Wireless automatic guide system can provide high-quality personalized information and service easily for the user, has very high practical value, especially is fit to be applied to the high occasion of large stadium, complex environment or information density.Wireless automatic guide system relates to technology such as computer, radio communication, location, multimedia and information database, how to develop the quality services resource, and high-quality information and service are sent to the key that user terminal is this type of system development easily and accurately.In the process that realizes guide to visitors, at first to position, obtain the environmental information of user position the user.Usually this need install a wireless identification tag near being identified thing, and difference is identified the different identifying information of label emission of thing; Each wireless identification tag is promptly outwards launched primary information at regular intervals automatically, and the receiver module of user terminal is in accepting state all the time.The terminal of carrying as the user will receive being identified the recognition coding of thing during through a label that is identified thing, and terminal is loaded into this coding in the user terminal program automatically, need not any manual operations.
Traditional wireless automatic guide system is generally in conjunction with embedded technology and radio-frequency (RF) tag identification (RFID), bluetooth wireless communication technologys such as (Bluetooth), set up the information database of literal about the guide to visitors scene, picture, voice, introductory video at user terminal, user oriented access services is provided.But, there is following shortcoming in traditional wireless automatic guide system: at first, no matter adopt and combine or directly make battery-powered scheme with power line, radio-frequency (RF) tag etc. all need extra power wiring or battery maintenance, more change jobs, and can greatly increase the difficulty and the cost of system power supply layout, management; Secondly, the location of radio-frequency (RF) tag mainly based on the wireless location algorithm of complexity, is being identified the higher occasion of thing density such as museum, exhibition center etc., and the positioning accuracy of current many location algorithms still is difficult to guarantee; At last, radio-frequency (RF) tag can't be used in the occasion that electromagnetic interference is had strict restriction.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of wireless automatic guide system based on visible light communication is provided, its compact conformation, easy to install, applied widely, the positioning accuracy height, antijamming capability is strong, and is safe and reliable.
According to technical scheme provided by the invention, the wireless automatic guide system of described visible light communication comprises the VISIBLE LIGHT EMISSION machine and has the portable terminal of photodiode that described portable terminal and VISIBLE LIGHT EMISSION machine are with the line-of-sight propagation wireless connections; Described VISIBLE LIGHT EMISSION machine is launched the visible light signal with identity identification information to portable terminal, and portable terminal receives described visible light signal by photodiode; After portable terminal carries out the recognition and verification coupling to described visible light signal, output portable terminal stored and the corresponding guide to visitors information of identity identification information.
Described portable terminal comprises optoelectronic receiver, and described optoelectronic receiver comprises photodiode; The output of optoelectronic receiver links to each other with player by decoder, after the visible light signal that described decoder receives optoelectronic receiver is discerned, and the corresponding guide to visitors information of player plays portable terminal stored.
Described optoelectronic receiver comprises the photoelectricity receiving circuit, described photoelectricity receiving circuit comprises photodiode, the output of photoelectricity receiving circuit links to each other with the self adaptation amplifying circuit, the self adaptation amplifying circuit links to each other with received data circuit by filter circuit, and described received data circuit is input in the decoder after visible light signal is changed.
Described VISIBLE LIGHT EMISSION machine sends visible light signal by serial communication or usb communication mode to portable terminal.
Described VISIBLE LIGHT EMISSION machine is by the coded system visible emitting signal of Manchester code or NRZ.
Described VISIBLE LIGHT EMISSION machine comprises power management module, and described power management module links to each other with the power end of identifying information generation module, brilliance control module and LED radiating circuit respectively; The visible light signal that described identifying information generation module will have identity identification information outwards sends output by brilliance control module and LED radiating circuit.
Described photodiode adopts P-I-N type photodiode or avalanche-type photodiode.
The guide to visitors information of described portable terminal output comprises extra exit, Visitor Route, peripheral exhibition section distribution situation, rest service area, position, toilet and current position; Portable terminal is exported corresponding guide to visitors information by literal, form, picture, voice or video.
Described power management module is converted to the alternating current of 220V the direct current of 12V or 16V.
Described identifying information generation module comprises microprocessor, and described microprocessor adopts single-chip microcomputer, ARM, DSP or FPGA.
Advantage of the present invention: the identifying information generation module in the VISIBLE LIGHT EMISSION machine is outwards launched the visible light signal with identity identification information by brilliance control module and LED radiating circuit, when portable terminal is positioned at corresponding VISIBLE LIGHT EMISSION machine and sends the scope of visible light signal, portable terminal is by the photodiode received signal, and by the respective decoder affirmation of decoding, when corresponding in visible light signal and the decoder is complementary, guide to visitors information in the portable terminal is exported by player, reached the function of wireless location and automatic guide to visitors, easy to install, reduce guide to visitors location cost, the positioning accuracy height, antijamming capability is strong, and is applied widely, energy-conserving and environment-protective, scientific and reasonable, safe and reliable.
Description of drawings
Fig. 1 is the structured flowchart of user mode of the present invention.
Fig. 2 is the syndeton block diagram of VISIBLE LIGHT EMISSION machine of the present invention and optoelectronic receiver.
Fig. 3 is the signal processing flow figure of portable terminal of the present invention.
Fig. 4 is the pulse width modulation output signal schematic diagram of coupled identification information.
Fig. 5 is optical sender and optical receiver modulation signal measurement result schematic diagram.
Fig. 6 is transmission of visible light distance and bandwidth test result schematic diagram.
Embodiment
The invention will be further described below in conjunction with concrete drawings and Examples.
As Fig. 1 ~ shown in Figure 3: in order to realize wireless more easily automatic guide to visitors, the present invention includes the VISIBLE LIGHT EMISSION machine, the wireless outside emission of described VISIBLE LIGHT EMISSION machine has the visible light signal of respective identity identifying information, the corresponding cooperation with portable terminal of VISIBLE LIGHT EMISSION machine.Portable terminal has photodiode, portable terminal receives the visible light signal with identity identification information by photodiode, after portable terminal is decoded to the visible light signal that receives and is discerned, the corresponding guide to visitors information of output portable terminal stored, guide to visitors information comprises extra exit, Visitor Route, peripheral exhibition section distribution situation, rest service area, position, toilet and current position; Portable terminal is exported corresponding guide to visitors information by literal, form, picture, voice or video.
In order to realize above-mentioned guide to visitors function, the VISIBLE LIGHT EMISSION machine comprises power management module, and the power output end of described power management module links to each other with the power end of identifying information generation module, brilliance control module and LED radiating circuit respectively.Wherein, power management module utilizes the power line of original illuminator, according to different led array arrangement mode and lighting powers, 220V AC is converted to corresponding 12V or 16V DC, for VISIBLE LIGHT EMISSION machine inside provides stable driving power.Be aided with protective circuits such as filter circuit and surge suppressor simultaneously, reduce the influence of network system, improve the reliability of LED radiating circuit optical sender.After power management module utilizes the power line of original illuminator, need not increase new power supply connected mode in the corresponding again guide to visitors place, easy to install, can reduce the guide to visitors cost simultaneously.
Described identifying information generation module sends the different specific identifying informations of thing that are identified by microprocessor; Microprocessor is provided with corresponding identifying information with corresponding position in the guide to visitors place, thereby after portable terminal enters this position, can discern corresponding information.Microprocessor can be a single-chip microcomputer, also can be DSP(Digital Signal Processor), ARM (Advanced RISC Machine), FPGA embedded arithmetic elements such as (Field Programmable Gate Array).The identifying information of identifying information generation module output comprises identification code and redundant code, also can comprise other digital coding.Identification code has relation one to one with being identified thing, has uniqueness in identification code table and redundant code table, and redundant code provides the ability of error checking for system.In data, occur connecting ' 0 ' situation, can adopt coded systems such as Manchester code or NRZ.
Described brilliance control module is by receiving microprocessor coupled identification information and pulse width modulation parameter, and output signal is attached to LED radiating circuit signal input part, reaches and takes into account the function of regulating the LED luminosity and sending identifying information simultaneously.For example the employing cycle be the pulse width modulating signal of 1ms as carrier wave, pulse width modulation sends identifying information when being empty.Three kinds of different pulse width modulation output signal values are as shown in Figure 4: wherein (a) pulse width modulation output duty cycle of showing is 80%.That is to say that there is output 80% time of signal in 1 unit period, other 20% time is for closing; Figure (b) and show respectively that (c) pulse width modulation of 50% and 20% duty ratio exports analog signal values.The cycle time of pulse width modulating signal is long more, mean that then the packet number that sends in the unit interval is few more, but be conditional this cycle time, and it must guarantee sufficiently long time transmission packet, should control the flicker frequency of LED simultaneously in human eye is accepted scope.
Described LED radiating circuit uses visible light as carrier, and modulation intelligence is launched, and takes into account the dual-use function of illumination and broadcast communication.LED is a current driving apparatus, and its brightness and forward current are directly proportional, the therefore general driving function that adopts devices realizations such as triode, trsanscondutance amplifier or special LED (Light Emitting Diode) constant current chip for driving to LED.With the triode common emitter circuit is example, and modulation signal is connected to the base stage of triode, and LED is connected on the emitter-base bandgap grading of triode, makes the flow through electric current of LED have modulation signal, and so just simply driving LED is launched the visible light that has modulation signal.What led light source sent is incoherent light, stabilized carrier can't be provided, thereby present VLC(Visible Light Communication) link mainly adopts intensity modulation (IM) and directly detects the method for (DD), and communication link selects the direct-injection type data to connect.
The VISIBLE LIGHT EMISSION machine is by serial communication or USB(Universal Serial BUS) communication mode is the wireless outside emission of visible light signal, so that portable terminal can wireless receiving when entering in the corresponding emitting area.
Described portable terminal comprises optoelectronic receiver; comprise the photodiode that is used to receive visible light signal in the described optoelectronic receiver; after described optoelectronic receiver receives visible light signal; by being input in the decoder after the preliminary treatment to visible light signal; the identity information of described decoder to comprising in the visible light signal; that is to say that identification code and redundant code discern contrast; when the identity information of protecting in the visible light signal that receives and decoder memory store up corresponding identification code corresponding after; decoder outputs to player with corresponding identification signal; the guide to visitors information of storing in advance in the player plays portable terminal, the visitor realizes automatic guide to visitors by watching the guide to visitors information that plays out in the player.The form of player plays guide to visitors information can be exported by corresponding the selection, satisfies different output requirements.
As shown in Figure 2: the optoelectronic receiver that has a photodiode receives by photodiode and has the visible light of modulation intelligence and be converted into the signal of telecommunication, through processing such as the amplification of the signal of telecommunication, filtering, demodulation are generated digital signal corresponding afterwards.Optoelectronic receiver mainly comprises photoelectricity receiving circuit, self adaptation amplifying circuit, filter circuit and received data circuit.Wherein, the photoelectricity receiving circuit uses P-I-N(P type doping-intrinsic-N type to mix) the type photodiode, also can use the avalanche-type photodiode, connect trans-impedance amplifier and transfer light signal to voltage signal; Self adaptation amplifying circuit: the output signal of trans-impedance amplifier is further amplified; Filter circuit: reduce the noise jamming in the circuit; Received data circuit: with analog signal conversion is digital signal, and its output coupled is to the signal input part of decoder.
As shown in Figure 3: decoder is decoded to the digital signal that receives by corresponding decoding microprocessor.The decoding process of decoder is: at first the digital signal that received data circuit is sent is reduced into true form according to coded system, true form is contrasted contrast identification code table default in the decoder again, compares corresponding true form whether in contrast identification code table; If true form is not in contrast identification code table, then direct decoding finishes, if true form is in contrast identification code table the time, once more to redundant code table, judge whether identification code is complementary with redundant code, when with redundant code table in when being complementary, corresponding identifying information is outputed in the player, export corresponding guide to visitors information by player; When not matching with redundant code table, directly finish decode procedure, wait for the process of decoding next time.
Player is a multimedia player, be provided with in the player and intercept communication interface, detect the decoding affirmation identity identification information that decoder sends in real time by intercepting communication interface, after intercepting communication interface and finding to have the identity identification information input, player is searched corresponding database, and databases contains corresponding guide to visitors information, find corresponding guide to visitors information after, by outputs such as display screens, realize automatic guide to visitors.
To carrying out hardware testing, verify whether its transmitting-receiving path is normally realized in order to VISIBLE LIGHT EMISSION machine and the portable terminal of realizing visible light communication.Adopting harmonic frequency is the input signal of the sine wave of 1 MHz as the VISIBLE LIGHT EMISSION machine, measurement result as shown in Figure 5, passage 1(CH1 wherein) be the transmitter input signal, passage 2(CH2) be the receiver output end signal.As seen from Figure 5, use visible light can correctly be modulated and receive as the light signal of carrier, but the designing requirement of compliance with system.
The sine wave signal of different frequency is tested its attenuation characteristic with distance, the effective propagation path and the bandwidth of checking native system.Under the certain situation of radiating circuit power (3 watts), change the spacing of portable terminal and VISIBLE LIGHT EMISSION machine, the amplitude of measuring-signal output, the result is as shown in Figure 6.As can be seen, effective propagation path is greater than 70 centimetres down for this little transmitting power (3 watts), and about 3 MHz of system bandwidth can satisfy the designing requirement of system.In the practical application scene, can be by the pulse width modulation parameter in flexible change transmitting power and the brightness regulation parts to reach the dual-use function of regulating effective propagation path and brightness of illumination.
As Fig. 1 ~ shown in Figure 3: during use, carry out the position, place of automatic guide to visitors at needs the VISIBLE LIGHT EMISSION machine is installed, the power-supply wiring of VISIBLE LIGHT EMISSION machine utilizes original wire structures of position, place, LED radiating circuit in the VISIBLE LIGHT EMISSION machine can be used as the lighting device in the place, thereby can reduce guide to visitors and the needed cost of illumination.Power management module in the VISIBLE LIGHT EMISSION machine is converted to the 220V alternating current direct current of 12V or 16V, identifying information generation module is carried out corresponding encoded according to the position of required guide to visitors, and corresponding coding information is outwards launched by brilliance control module and LED radiating circuit.Set in advance corresponding decoding table in the portable terminal and reached and the corresponding guide to visitors information of described decoding table, guide to visitors information is stored in the portable terminal with the form of literal, chart, video or audio frequency.During guide to visitors, the related personnel holds portable terminal in the place, when portable terminal moves to the relevant position in the place and be positioned at the visible light signal scope that corresponding VISIBLE LIGHT EMISSION machine sends, portable terminal receives corresponding signal by photodiode, optoelectronic receiver carries out corresponding visible light signal respective handling and is converted to digital signal, and digital signal is input in the decoder.By decoder digital signal is decoded, after the respective identity identifying information that obtains was identified after the decoding, the guide to visitors information that the player plays in the portable terminal is stored in advance was embodied as related personnel's wireless automatic guide to visitors.
(Visible Light Communication, VLC) technology is the short distance high-speed radiocommunication mode of a kind of novel use visible light as information carrier to visible light communication.Than the traditional lighting light source, advantages such as that semiconductor light-emitting-diode (LED) not only has is energy-conservation, efficient, the life-span is long, and having the luminescence response characteristic that the high speed point goes out, the feasibility that led light source high-power, high brightness is used as the wireless light communication link is verified.
With traditional, also be to use more wireless automatic guide system at present to compare based on technology for radio frequency, have following many advantages based on the wireless automatic guide system of visible light communication technology:
1, visible light communication can combine with the existing power for illumination line of force in the actual environment, and electric wiring is convenient and swift.The led light source that is used to communicate by letter can be installed in the place of any needs, and illumination both is provided, and can be used for realizing wireless data transmission easily again; Therefore, increase extra supply of electric power circuit in the system layout hardly, can set up transmitter, reached the purpose that makes full use of existing resource, environmental protection low-carbon (LC) based on the wireless automatic guide system of visible light communication by the existing illuminator of easy transformation.
2, visible light communication belongs to the green communications technology, and the radiation spectrum of its signal optical source is positioned at the visible light wave range all harmless to human eye, human body, does not have extra electromagnetic radiation, as safe as a house, environmental protection.
3, LED signal optical source transmitting power height, for the normal optical radio communication, signal optical source often uses semiconductor laser, and for avoiding injuring human eye, human body, the laser transmitting power must be very low, seriously limited systematic function; For radio communication, radiofrequency signal is potential harmful to human body, can not unrestrictedly increase transmitting power.And in visible light LED communication system, communication light source is and the on all four incoherent visible light of natural daylight therefore generally to need not limit transmit power.
4, need not the radio-frequency spectrum card.Be subjected to radio-frequency spectrum control, current frequency spectrum resource anxiety, available radio frequency are very limited, and there is not the frequency-assignment problem that may relate in other many wireless communication technologys in LED-based visible light communication.
5, no electromagnetic interference can be applicable to electromagnetic interference is had the occasion of strict requirement for restriction.
6, the wireless location principle is simple, adopt the wireless automatic guide system of visible light communication technology, because visible light that LED sends out has anisotropy on the angle of departure and spatial light intensity is uneven distribution, can avoid adjacent light signal to interfere with each other by rational deployment, therefore the direct identifying information of receiver/transmitter broadcast transmission of optical receiver, effectively simple, need not to adopt complicated wireless location algorithm.
In a word, can take into account illumination and just obtain increasing the concern and application with the visible light communication technology based on led light source of the two big functions of communicating by letter.
The present invention makes guide system have wireless locating function and has automatic guide to visitors function simultaneously concurrently by the corresponding cooperation with portable terminal of VISIBLE LIGHT EMISSION machine.Wireless locating function is to utilize the LED emission band visible light signal of identifying information to be arranged as the numbering that is identified thing, receive, decode by terminal, and the identifying information that contrast is arranged is in advance determined the residing physical location of holder terminal with the relation that is identified thing according to being identified the position of thing in venue; Make the user can understand Venues Environment information such as extra exit, Visitor Route, peripheral exhibition section distribution situation, rest service area, position, toilet rapidly, bring great convenience, also can make the design of Venues Environment more scientific and reasonable, more humane to the user.
Automatically the guide to visitors function is after realizing wireless location, just can comprise the multimedia navigation information that literal, form, picture, voice or video etc. are abundant automatically for the user plays the details that are identified thing in terminal.For example, indoor venues such as most exhibition center, museum are limited to factors such as place size and environmental requirement, often are difficult to display exhibition thing is comprehensively introduced.By this automatic guide to visitors scheme, be stored in all information materials that need introduce or present in the portable terminal in advance, in the guide to visitors process according to the visible light signal decoded results of terminal to different objects, trigger corresponding multimedia document, realize the function of automatic guide to visitors, thereby, comprise the personalization selection of Visitor Route, associated multimedia information etc. for the user provides personalized even interactively MMS (Multimedia Message Service).
Claims (10)
1. the wireless automatic guide system of a visible light communication comprises the VISIBLE LIGHT EMISSION machine and has the portable terminal of photodiode that described portable terminal and VISIBLE LIGHT EMISSION machine are with the line-of-sight propagation wireless connections; It is characterized in that: described VISIBLE LIGHT EMISSION machine is launched the visible light signal with identity identification information to portable terminal, and portable terminal receives described visible light signal by photodiode; After portable terminal carries out the recognition and verification coupling to described visible light signal, output portable terminal stored and the corresponding guide to visitors information of identity identification information.
2. the wireless automatic guide system of visible light communication according to claim 1, it is characterized in that: described portable terminal comprises optoelectronic receiver, described optoelectronic receiver comprises photodiode; The output of optoelectronic receiver links to each other with player by decoder, after the visible light signal that described decoder receives optoelectronic receiver is discerned, and the corresponding guide to visitors information of player plays portable terminal stored.
3. the wireless automatic guide system of visible light communication according to claim 2, it is characterized in that: described optoelectronic receiver comprises the photoelectricity receiving circuit, described photoelectricity receiving circuit comprises photodiode, the output of photoelectricity receiving circuit links to each other with the self adaptation amplifying circuit, the self adaptation amplifying circuit links to each other with received data circuit by filter circuit, and described received data circuit is input in the decoder after visible light signal is changed.
4. the wireless automatic guide system of visible light communication according to claim 1, it is characterized in that: described VISIBLE LIGHT EMISSION machine sends visible light signal by serial communication or usb communication mode to portable terminal.
5. the wireless automatic guide system of visible light communication according to claim 1 is characterized in that: described VISIBLE LIGHT EMISSION machine is by the coded system visible emitting signal of Manchester code or NRZ.
6. the wireless automatic guide system of visible light communication according to claim 1, it is characterized in that: described VISIBLE LIGHT EMISSION machine comprises power management module, and described power management module links to each other with the power end of identifying information generation module, brilliance control module and LED radiating circuit respectively; The visible light signal that described identifying information generation module will have identity identification information outwards sends output by brilliance control module and LED radiating circuit.
7. the wireless automatic guide system of visible light communication according to claim 1 is characterized in that: described photodiode employing P-I-N type photodiode or avalanche-type photodiode.
8. the wireless automatic guide system of visible light communication according to claim 1 is characterized in that: the guide to visitors information of described portable terminal output comprises extra exit, Visitor Route, peripheral exhibition section distribution situation, rest service area, position, toilet and current position; Portable terminal is exported corresponding guide to visitors information by literal, form, picture, voice or video.
9. the wireless automatic guide system of visible light communication according to claim 6, it is characterized in that: described power management module is converted to the alternating current of 220V the direct current of 12V or 16V.
10. the wireless automatic guide system of visible light communication according to claim 6, it is characterized in that: described identifying information generation module comprises microprocessor, described microprocessor adopts single-chip microcomputer, ARM, DSP or FPGA.
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