CN206223968U - A kind of visible light communication 3 D positioning system based on CDMA modulation - Google Patents
A kind of visible light communication 3 D positioning system based on CDMA modulation Download PDFInfo
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- CN206223968U CN206223968U CN201621241096.1U CN201621241096U CN206223968U CN 206223968 U CN206223968 U CN 206223968U CN 201621241096 U CN201621241096 U CN 201621241096U CN 206223968 U CN206223968 U CN 206223968U
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Abstract
The utility model discloses a kind of visible light communication 3 D positioning system based on CDMA modulation, including location information transmitting subsystem, location information transmission subsystem and positioning terminal receiving subsystem；The location information transmitting subsystem has OOK baseband-modem modules, CDMA band spectrum modulations module, LED drive circuit and LED lamp；The location information transmission subsystem is indoor positioning space；The positioning terminal receiving subsystem has photoelectricity testing part, amplifies filtering process module, CDMA despreading modules；The OOK baseband-modem modules, CDMA band spectrum modulations module, LED drive circuit and LED lamp are sequentially connected；The photoelectricity testing part, amplification filtering process module and CDMA despreadings module are sequentially connected.The utility model reasonable in design, compared with the precision that traditional visible light communication location technology not only substantially increases positioning, and simple system, stabilization and does not need synchronized transmissions, has broad application prospects.
Description
Technical field
The utility model is related to visible light communication location technology, more particularly to a kind of visible light communication based on CDMA modulation
3 D positioning system.
Background technology
In recent years, indoor locating system (Indoor Positioning Systems, IPS) turns into most popular topic,
The technology is conducive to the indoor service of the mankind and intelligent robot, can provide the user positional information and push corresponding
Information on services.Global positioning system (Global Positioning System, GPS) is good outdoor application navigation system,
Had a wide range of applications in fields such as cell phone map service, auto navigation, ship and aircrafts.Yet with multipath fading, electromagnetism
The interference of screen effect and other wireless devices cause traditional outdoor positioning technology signal coverage rates indoors such as GPS compared with
, there is larger position error for indoor positioning in difference.So, in recent years, many interiors based on radio magnetic wave of being born are determined
Position technology, such as：ZigBee, WiFi, RFID, bluetooth, infrared positioning etc., these methods provide several meters to tens centimetres of positioning
Precision.However, these alignment systems have the disadvantage that：I () needs to reconfigure more signal access point, it is indoor fixed to increased
The cost and the difficulty of control of position system；(ii) because the spatial distribution of wireless signal is uneven, and stability is not high, same
Fluctuation is stronger on some position location points, and then limits the precision of positioning；(iii) these wireless location technologies can be produced
Electromagnetic interference, on the one hand can be influenceed by other wireless services and then have impact on the quality of positioning, on the other hand for similar
In the electromagnetic susceptibilities such as hospital, airport occasion and do not apply to.
It is different from above-mentioned indoor positioning technologies, it is seen that light indoor positioning technologies are a kind of based on visible light communication technology
The indoor positioning technologies of (visible light communication, VLC), it is fixed to have compared with traditional indoor positioning technologies
Position high precision, without electromagnetic interference, few add-on module, good confidentiality, take into account communication with illumination the advantages of, caused many in the world
The concern of experts and scholars.Existing VLC location algorithms can substantially be divided three classes：Scene analysis method (scene analysis),
Neighbouring method (proximity), triangulation location (triangulation algorithm).Scene analysis method refers to by that will survey
A kind of location algorithm that amount information is matched with precalibrated database, eliminates the process of calculating.But need to carry out
Accurate pre-calibration, can not immediately apply to a new environmental facility the inside.Neighbouring rule has multiple reference by one
The grid of point, each lattice point has a known position, thus resolution ratio of the precision for positioning not over grid in itself.
Triangulation location is the algorithm that location estimation is carried out using the geometric properties of triangle, and it is broadly divided into two kinds：
Preset angle configuration and Multi lateration.Preset angle configuration refers to angle of arrival (angle of of the measurement receiving terminal relative to several location reference points
Arrival, AOA), the estimation of position is realized by the intersection point of investigation line.Preset angle configuration is essentially imaging location technology, leads to
Camera is crossed to capture field of view of receiver angle (field of view, FOV).And polygon rule be by measure receiving terminal from it is different
Floor projection distance between location reference point LED light source and then estimate the specific coordinate value of receiving terminal.The distance inspection of positioning
Survey typically can be by arrival time (time-of-arrival, TOA), reaching time-difference (time-difference-of-
Arrival, TDOA) or the mode such as received signal strength (Received signal strength, RSS).Wherein RSS algorithms lead to
The distance that decay factor of the measurement visible light signal in the transmittance process of space can detect positioning is crossed, TOA or TDOA is not as
Require that transmitting terminal and receiving terminal have the strict synchronised clock cycle in algorithm, control is simple and with positioning precision higher.
Further, triangle polyester fibre algorithm is generally used by based on intensity modulated and Direct Inspection Technology (Intensity
Modulationand Direct Detection, IM/DD) received signal strength come computed position apart from when, at least need
It is to be understood that three position coordinateses of different reference points, and the ID positional informations that different reference point information sources are sent are in time domain and frequency domain
Upper is usually what is overlapped, and intersymbol interference can be produced due to multipath effect, and then greatly limit the precision of VLC positioning.For
Overcome intersymbol interference, further improve the precision of positioning, Kim Hyun-Seung etc. and use carrier allocation techniques, but due to hair
Penetrate end and receiving terminal not change with frequency stabilization, so that extra backoff algorithm；When Yang Se-Hoon etc. are respectively adopted
Gap distribution technique and Wavelength Assignment technology overcome the influence of intersymbol interference, but need transmitting terminal and receiving terminal to have strict synchronization
And need optical filter or multiple receiver diversities to receive；These methods all considerably increase the complexity of system.
Utility model content
In order to overcome the disadvantages mentioned above and deficiency of prior art, the purpose of this utility model is to propose one kind to be based on
The visible light communication 3 D positioning system of CDMA modulation, the system architecture is simple, easily realizes, positioning precision is high.
A kind of visible light communication 3 D positioning system based on CDMA modulation, including location information transmitting subsystem, positioning
Message transmission subsystem and positioning terminal receiving subsystem；Location information transmitting subsystem have OOK baseband-modem modules,
CDMA band spectrum modulations module, LED drive circuit and LED lamp；The location information transmission subsystem is indoor positioning space；Institute
Stating positioning terminal receiving subsystem has photoelectricity testing part, amplifies filtering process module, CDMA despreading modules；The OOK bases
Band modulation module, CDMA band spectrum modulations module, LED drive circuit and LED lamp are sequentially connected；The photoelectricity testing part, put
Big filtering process module and CDMA despreadings module are sequentially connected.
Further, the ID positional informations of the LED lamp related to three dimensional physical coordinate are by the OOK baseband modulations mould
Baseband modulation signal is formed after block；The baseband modulation signal forms spread spectrum after carrying out spread processing through CDMA band spectrum modulations module
Signal；The spread-spectrum signal drives LED lamp transmitting visible light signal by LED drive circuit；The visible light signal passes through
Indoor positioning is captured behind space by photoelectricity testing part；The photoelectricity testing part will be seen that optical signal is converted to electric signal
Afterwards, the signal before despreading is formed after amplifying filtering process；Signal before the despreading is passed through by CDMA despreadings module
Cross the ID positional informations of transmission；According to the content to ID positional informations, it is determined that the band of position for positioning and the light intensity attenuation factor,
The distance between receiving terminal and each LED reference points in the region of position location are obtained by the decay factor of light intensity, it is fixed according to triangle
Position method and then realize the determination of positioning terminal position coordinates.
Compared with prior art, the utility model has advantages below and beneficial effect：
(1) innovatively be applied to CDMA modulation techniques in VLC systems by the utility model, the speed and matter of radio communication
The bandwidth that amount can be significantly improved without increasing device.
(2) multipath effect brought for multiple there is a problem of for reference point in alignment system, the utility model wound
Use light orthogonal code to new property, the signal that time-domain and frequency-domain is overlapped can be separated, and then realize code division multiplexing, can overcome by
In the position error that intersymbol interference is brought.
(3) innovatively with triangulation location be combined CDMA modulation techniques by the utility model, with traditional positioning system
System is compared, and can not only realize high-precision positioning, and due to not needing synchronized transmissions so as to considerably increase VLC positioning system
The stability of system.
Brief description of the drawings
Fig. 1 be example in realize indoor visible light communication positioning schematic diagram.
Fig. 2 is system block diagram of the present utility model.
Fig. 3 is that the utility model realizes the visible light communication indoor locating system theory diagram based on CDMA modulation.
Specific embodiment
With reference to embodiment and accompanying drawing, the utility model is described in further detail, but reality of the present utility model
Apply mode not limited to this.
Embodiment 1
As shown in figure 1, for a kind of RSS three-dimensional locations based on CDMA modulation realize indoor visible light communication positioning
System schematic.In the present embodiment, in this L*W*H (unit：Set at four end points of the ceiling of system space model m)
Four LED lamps are put as a position units for positioning, LED A, LED B, LED C, LED D as shown in Figure 1.In distance
On the horizontal plane of ground h, it is three drift angles of the equilateral triangle of 0.01m that three identical photodiodes are located at the length of side respectively
Composition photoelectricity testing part.
Such as Fig. 2, launch subsystem, determine based on the visible light communication 3 D positioning system of CDMA modulation, including location information
Position message transmission subsystem and positioning terminal receiving subsystem；The location information transmitting subsystem has OOK baseband modulation moulds
Block, CDMA band spectrum modulations module, LED drive circuit and LED lamp；The location information transmission subsystem is empty indoor positioning
Between；The positioning terminal receiving subsystem has photoelectricity testing part, amplifies filtering process module, CDMA despreading modules；It is described
OOK baseband-modem modules, CDMA band spectrum modulations module, LED drive circuit and LED lamp are sequentially connected；The photoelectric detector
Part, amplification filtering process module and CDMA despreadings module are sequentially connected；The ID positions of the LED lamp related to three dimensional physical coordinate
Information after OOK baseband-modem modules by forming baseband modulation signal；The baseband modulation signal is through CDMA band spectrum modulation modules
Spread-spectrum signal is formed after carrying out spread processing；The spread-spectrum signal drives LED lamp transmitting visible ray by LED drive circuit
Signal；The visible light signal is captured by behind indoor positioning space by photoelectricity testing part；The photoelectricity testing part will
After visible light signal is converted to electric signal, the signal before despreading is formed after amplifying filtering process；Signal before the despreading
The ID positional informations by transmission are obtained by CDMA despreading modules；According to the concrete analysis of the content to ID positional informations, really
The band of position of positioning and the light intensity attenuation factor, three of positioning terminal in positioning region are obtained with reference to the triangulation location
Dimension position coordinates, and then realize the determination of positioning terminal position coordinates.
As an example, triangulation location of the present utility model can use existing RSS triangulation locations, specific as follows：
The ID positional informations of three LED lamps itself therein are carried out into baseband modulation, shape by OOK baseband-modem modules
Into baseband modulation signal；The baseband modulation signal after the spread spectrum operation of CDMA spread spectrum modules by forming spread-spectrum signal.Spread spectrum
Operation be broadly divided into spread spectrum and scrambling two steps, data are spread using spreading code first, then by scrambler be loaded into spread spectrum after
Signal in.Use m-sequence as the coding of channel in the implementation case, Walsh yards used as geocoding.The length be 2n,
Can be by hadamard matrix (Hadamard matrix) with 2n the Walsh of element yardsProduce
It is raw.
By after DS-CDMA codings, it is visible that the spread-spectrum signal drives LED lamp to launch respectively by LED drive circuit
Light ID signals, include the ID positional informations of respective LED lamp in these visible rays ID signals；The visible ray ID signals pass through
Free space reaches photoelectricity testing part；The photoelectricity testing part will be seen that light ID signals are converted to electric signal.
The electric signal sequentially passes through amplifying circuit, auto-adaptive filter circuit and is amplified filtering process again.Due to Walsh
The complete orthogonality of code, after being adjudicated through oversampling, the information of each LED lamp by after corresponding matching sef-adapting filter,
The light intensity attenuation factor of signal when corresponding ID position signallings and spatial is finally obtained by the treatment of CDMA despreading modules.
Further, described RSS triangle polyester fibre iterative algorithms are recycled to be processed, it generally includes following two
Step：The compensation part of height and height is assumed by using the ID positional informations of LED lamp transmission, two-dimensional localization is reused
Algorithm realizes the positioning in X/Y plane, and then realizes the receiving terminal i.e. three-dimensional location coordinates of photoelectricity testing part by iterative algorithm
Determination.Wherein RSS triangle polyester fibres iterative algorithm detailed description is as follows：For indoor VLC alignment systems, direct projection is mainly considered
Line of sight link, because the channel gain of photoelectricity testing part of the optical signal from LED lamp to positioning terminal is represented by：
Wherein θ is the angle of departure of LED；It is the incidence angle of photoelectricity testing part；A is the significant surface of photoelectricity testing part
Product, d is LED lamp to the distance between positioning terminal, θcIt is the angle of visual field of positioning terminal, Ts(θ) is the gain of optical filter, G
(θ) is the gain of optical lens, mtAnd mrIt is lambert's exponent number.
Can obtain in positioning unit that distance is between i-th LED and positioning terminal by formula (1)：
Wherein,
When positioning terminal horizontal positioned is considered, haveWherein, (H-h) is LED and positioning terminal
Between vertical range, H for positioning unit height, so formula (2) can be expressed as：
H (0) can be obtained by the detection of the light intensity attenuation factori, h can be obtained by the decision algorithm of positioning height
The as z-axis coordinate z of positioning terminale.And then can obtain in positioning unit between i-th LED and positioning terminal apart from di.According to
Pythagorean theorem, can obtain the floor projection in positioning unit between i-th LED and positioning terminal apart from di,x,y
According to tri- LED lamps of LEDA, LEDB, LEDC in positioning region, with triangulation location, positioning can be obtained eventually
Position coordinates (the x at ende,ye)
Wherein, [xA, xB, xC] and [yA, yB, yC] it is respectively x the and y physics seat of tri- LED lamps of LEDA, LEDB, LEDC
Mark.Three-dimensional coordinate (the x of positioning terminal can finally be obtainede,ye,ze)
RSS triangles iterative algorithm and the ID position signallings, can tentatively judge photoelectricity testing part position
Region, i.e. positioning unit；According to the size of the light intensity attenuation factor for receiving signal, photodiode and each LED can be obtained
The distance between light fixture, and then realize being accurately positioned for position.
Above-described embodiment is only a kind of implementation method of the present utility model, but implementation method of the present utility model is not by upper
State the limitation of embodiment, other it is any without departing from the change made under Spirit Essence of the present utility model and principle, modify, replace
Generation, combination, simplification should be equivalent substitute mode, be included in protection domain of the present utility model it.
Claims (2)
1. a kind of visible light communication 3 D positioning system based on CDMA modulation, including location information transmitting subsystem, positioning letter
Breath transmission subsystem and positioning terminal receiving subsystem；Characterized in that, the location information transmitting subsystem has OOK base band
Modulation module, CDMA band spectrum modulations module, LED drive circuit and LED lamp；The location information transmission subsystem is indoor fixed
Bit space；The positioning terminal receiving subsystem has photoelectricity testing part, amplifies filtering process module, CDMA despreading modules；
The OOK baseband-modem modules, CDMA band spectrum modulations module, LED drive circuit and LED lamp are sequentially connected；The smooth electric-examination
Device, amplification filtering process module and CDMA despreadings module is surveyed to be sequentially connected.
2. it is according to claim 1 it is a kind of based on CDMA modulation visible light communication 3 D positioning system, it is characterised in that
The ID positional informations of the LED lamp related to three dimensional physical coordinate after the OOK baseband-modem modules by forming baseband modulation
Signal；The baseband modulation signal forms spread-spectrum signal after carrying out spread processing through CDMA band spectrum modulations module；The spread spectrum letter
Number by LED drive circuit, LED lamp transmitting visible light signal is driven；The visible light signal is by behind indoor positioning space
Captured by photoelectricity testing part；After the photoelectricity testing part will be seen that optical signal is converted to electric signal, filtered by amplifying
The signal before despreading is formed after treatment；Signal before the despreading is obtained by CDMA despreading modules to be believed by the ID positions of transmission
Breath；According to the content to ID positional informations, it is determined that the band of position of positioning and the light intensity attenuation factor, by the decay of light intensity because
Son obtains the distance between receiving terminal and each LED reference points in the region of position location, and then realizes positioning terminal position coordinates
It is determined that.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107421506A (en) * | 2017-08-11 | 2017-12-01 | 华南理工大学 | A kind of visual pursuit alignment system and method based on indoor visible light communication |
| CN107942288A (en) * | 2017-10-19 | 2018-04-20 | 中国地质大学（武汉） | The LED localization methods and system of a kind of combination OFDM |
| CN108363040A (en) * | 2018-01-18 | 2018-08-03 | 华南理工大学 | A kind of visible light indoor orientation method based on OFDMA technologies |
| CN109884589A (en) * | 2019-01-31 | 2019-06-14 | 华南理工大学 | A kind of degree of precision visible light Indoor Robot positioning device |
-
2016
- 2016-11-17 CN CN201621241096.1U patent/CN206223968U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107421506A (en) * | 2017-08-11 | 2017-12-01 | 华南理工大学 | A kind of visual pursuit alignment system and method based on indoor visible light communication |
| CN107421506B (en) * | 2017-08-11 | 2023-03-28 | 华南理工大学 | Visual tracking and positioning system and method based on indoor visible light communication |
| CN107942288A (en) * | 2017-10-19 | 2018-04-20 | 中国地质大学（武汉） | The LED localization methods and system of a kind of combination OFDM |
| CN108363040A (en) * | 2018-01-18 | 2018-08-03 | 华南理工大学 | A kind of visible light indoor orientation method based on OFDMA technologies |
| CN109884589A (en) * | 2019-01-31 | 2019-06-14 | 华南理工大学 | A kind of degree of precision visible light Indoor Robot positioning device |
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