CN111413673B - Multi-LED transmitting end positioning method and system based on LiFi technology - Google Patents
Multi-LED transmitting end positioning method and system based on LiFi technology Download PDFInfo
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- CN111413673B CN111413673B CN202010349320.3A CN202010349320A CN111413673B CN 111413673 B CN111413673 B CN 111413673B CN 202010349320 A CN202010349320 A CN 202010349320A CN 111413673 B CN111413673 B CN 111413673B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO 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
- G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S5/16—Position-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
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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
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- 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
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Computer Networks & Wireless Communication (AREA)
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Abstract
The invention relates to a multi-LED transmitting end positioning method and system based on LiFi technology, which provides a light reflection path according to a laser pulse ranging principle, wherein a LiFi AP end is introduced with a ranging module, the ranging module carries out coherent detection according to known transmitting signals and received signals so as to obtain the distance between a PD and a terminal, then the accurate spatial position relation between the terminal and the AP is obtained according to a spatial triangle calculation method, and the AP obtains final accurate position information of the terminal according to the position information of the AP and the accurate spatial position relation between the terminal and the AP. The multi-LED transmitting end positioning method and system based on the LiFi technology are simple, economical and good in instantaneity, fully utilize the interval between the downlink signal and the uplink signal, have no influence on the LiFi protocol, ensure high-speed communication and realize the positioning function.
Description
Technical Field
The invention belongs to the technical field of communication, and particularly relates to a method and a system for positioning a multi-LED transmitting end based on a LiFi technology.
Background
There is an increasing trend to implement location-based services and applications, such as indoor navigation or opportunistic marketing, which requires more accurate Indoor Positioning Systems (IPS), and currently common indoor positioning technologies include wireless fidelity (WiFi), bluetooth, radio Frequency (RF), ultra Wideband (UWB), infrared and Visible Light Communications (VLC), etc.
The VLC has very high Positioning Accuracy (PA) and energy efficiency, is low in positioning cost, has the capability of resisting the interference of the traditional radio frequency signals, and becomes a research hot spot of indoor positioning technology in recent years. The positioning of visible light wireless communication (LiFi) mainly comprises two modes of direct positioning and two-step positioning: direct positioning techniques are often very complex, but do not require prior parameter estimation to obtain an optimal solution; the two-step positioning method performs data extraction in the first stage and estimates the position in the second stage, thereby giving a suboptimal result. The existing LiFi positioning technology mainly comprises five methods of proximity, fingerprint, triangulation, visual analysis and a hybrid algorithm.
Proximity, fingerprint and triangulation methods use a Photodiode (PD) as the receiver, requiring a multiplexing process; the visual analysis technology takes a camera as a receiver without multiplexing; the hybrid algorithm uses a photodiode or camera as the receiver, multiplexing being optional.
However, the communication mode of the camera as a receiver cannot be compatible with the LiFi protocol, so that the speed of an image sensor of the camera is slow, and high-speed data transmission cannot be realized; the communication method using the photodiode as the receiver requires accurate time synchronization between the receiving end and the transmitting end, and has high time precision requirement.
Disclosure of Invention
The invention aims to provide a multi-LED transmitting end positioning method and system based on LiFi technology, which realize high-precision positioning and quick positioning according to an accurate positioning method of a light reflection loop and can be applied to multi-LED transmitting ends.
The invention solves the problems by adopting the following technical scheme: a multi-LED transmitting end positioning method based on LiFi technology comprises the following steps:
(1) The LiFi terminal sends a positioning request to the LiFi AP receiving end, and simultaneously sends a terminal modulation-demodulation time interval delta t and a terminal ID to the AP.
(2) The AP allocates the appointed downlink measurement time slot SL according to the reporting terminal ID i 。
(3) The AP measures and transmits the known S in the appointed measurement time slot t Signal, S t The signals are sent to the AP ranging module while being sent to the terminal receiver PD through a plurality of visible light LEDs.
(4) The terminal opens the switch K to demodulate S in the appointed measurement time slot r The signal is sent to the modulator, and is sent to the AP receiving end through the infrared LED, and the infrared LED signal is amplified by the amplifier and then is sent to the AP ranging module.
(5) The AP ranging module is according to the known S t The signal and the received amplified infrared LED signal are subjected to coherent operation and the time delta t of terminal modulation and demodulation is subtracted, so that the transmitted signal is obtainedThe corresponding distance d is calculated by the time difference Deltatx between the reflection and the Deltatx X-AP ，d X-AP = ((Δtrx- Δt)/2) speed of light.
(6) AP end-to-multiple distances d X-AP And carrying out space trigonometric operation to obtain the space position, namely the distance and azimuth relation, of the terminal.
Preferably, the Sr signal transmission time of step (4) is determined by a ranging process.
Preferably, the coherent operation in step (5) is a deconvolution calculation.
Preferably, the time difference Δtr in step (5) may also be used to synchronize the AP clock T AP And clock T of terminal TE ，T TE =T AP -[(Δtrx-Δt)/2]。
The invention further aims to provide a multi-LED transmitting end positioning system based on LiFi technology, which comprises a LiFi AP end and a LiFi terminal, wherein the LiFi AP end and the LiFi terminal both comprise a transmitting device and a receiving device, the LiFi AP end transmitting device is 3 groups and more, and the LiFi AP end receiving device is 1 group; the LiFi AP end transmitting device comprises a first coding memory, wherein the output end of the first coding memory is respectively connected with the input end of a first analog-to-digital converter and the input end of a ranging module, the output end of the first analog-to-digital converter is connected with the input end of a first signal modulator, the output end of the first signal modulator is connected with the input end of a first LED driving controller, and the output end of the first LED driving controller is connected with an LED lamp; the LiFi AP end receiving device comprises a first PD receiver, the output end of the first PD receiver is connected with the input end of a first amplifier, the output end of the first amplifier is respectively connected with the input end of a first signal demodulator and the input end of a ranging module, and the output end of the first signal demodulator is connected with a first coding processor through a first digital-to-analog converter.
Preferably, the LiFi terminal transmitting device comprises a second coding memory, a second analog-to-digital converter, a second signal modulator, a second LED driving controller and an infrared LED lamp; the LiFi terminal receiving device comprises a second PD receiver, a second amplifier, a second signal demodulator, a second digital-to-analog converter and a second coding processor.
Compared with the prior art, the invention has the advantages that:
(1) According to the invention, a light reflection path is provided according to a laser pulse ranging principle, liFi signals are sent to a terminal through a multi-LED transmitting terminal at an AP end, and then uplink light is subjected to coherent detection to obtain accurate distance information, wherein the coherent detection method is to deconvolute or perform coherent peak detection through known pulse signals and received known pulse signals, so that the multi-LED transmitting terminal positioning method based on the LiFi technology is simple, economical and good in real-time performance.
(2) The optical pulse detection method utilizes the existing mature detection algorithm through the optimized structure, reduces the complexity of the system and improves the efficiency.
(3) The method based on the LiFi protocol fully utilizes the time division multiplexing characteristic of the LiFi protocol, fully utilizes the interval between the downlink signal and the uplink signal, has no influence on the LiFi protocol, can realize high-speed data transmission, and simultaneously realizes the positioning function.
(4) The positioning system and the positioning method can accurately synchronize the AP clock and the clock of the terminal.
Drawings
Fig. 1 is a flowchart of a method for positioning a multi-LED emitting end based on LiFi technology in an embodiment of the present invention.
Fig. 2 is a schematic diagram of a multi-LED emitter positioning system based on LiFi technology in an embodiment of the present invention.
Fig. 3 is an enlarged view of a LiFi AP end in the multi-LED emitter location system based on LiFi technology of fig. 2.
Fig. 4 is an enlarged view of a lif terminal in the multi-LED emitter positioning system based on lif technology of fig. 2.
Detailed Description
The invention is described in further detail below with reference to the embodiments of the drawings.
As shown in fig. 1, a flowchart of a multi-LED emitter positioning method based on LiFi technology in this embodiment is shown.
A multi-LED transmitting end positioning method based on LiFi technology comprises the following steps:
(1) The LiFi terminal sends a positioning request to the LiFi AP receiving end, and simultaneously sends a terminal modulation-demodulation time interval delta t and a terminal ID to the AP.
(2) The AP allocates the appointed downlink measurement time slot SL according to the reporting terminal ID i 。
(3) The AP measures and transmits the known S in the appointed measurement time slot t Signal, S t The signals are sent to the AP ranging module while being sent to the terminal receiver PD through a plurality of visible light LEDs.
(4) The terminal opens the switch K to demodulate S in the appointed measurement time slot r The signal is sent to the modulator, and is sent to the AP receiving end through the infrared LED, and the infrared LED signal is sent to the AP ranging module after being amplified by the amplifier, wherein the Sr signal sending time is determined by the ranging process.
(5) The AP ranging module is according to the known S t The signal and the received amplified infrared LED signal are subjected to deconvolution calculation and the time delta t of terminal modulation and demodulation is subtracted to obtain the time difference delta trx between transmission and reflection, and the corresponding distance d is calculated through delta trx X-AP ，d X-AP = ((Δtrx- Δt)/2) speed of light, the time difference Δtrx may also be used to synchronize the AP clock T AP And clock T of terminal TE ，T TE =T AP -[(Δtrx-Δt)/2]。
(6) AP end-to-multiple distances d X-AP And carrying out space trigonometric operation to obtain the space position, namely the distance and azimuth relation, of the terminal.
As shown in fig. 2, fig. 3 is a schematic diagram of a multi-LED transmitting end positioning system based on the LiFi technology, fig. 3 is an enlarged view of a LiFi AP end in the multi-LED transmitting end positioning system based on the LiFi technology, and fig. 4 is an enlarged view of a LiFi terminal in the multi-LED transmitting end positioning system based on the LiFi technology.
The multi-LED transmitting end positioning system comprises a LiFi AP end and a LiFi terminal, wherein the LiFi AP end and the LiFi terminal both comprise a transmitting device and a receiving device, the common LED visible light of a transmitting signal of the LiFi AP end transmitting device is connected with the receiving end of the LiFi terminal receiving device, and the infrared LED signal of the transmitting end of the LiFi terminal transmitting device is connected with the receiving end of the LiFi AP end receiving device.
The LiFi AP end transmitting devices are provided with 3 groups, and each group of transmitting devices are independent and specifically comprise: the output end of the first coding memory is respectively connected with the first analog-to-digital converter A, the first analog-to-digital converter B, the first analog-to-digital converter C and the ranging module of the AP end; the output end of the first analog-to-digital converter A is connected with the input end of the first signal modulator A, the output end of the first signal modulator A is connected with the input end of the first LED driving controller A, and the output end of the first LED driving controller A is connected with the LED lamp A; the output end of the first analog-to-digital converter B is connected with the input end of the first signal modulator B, the output end of the first signal modulator B is connected with the input end of the first LED driving controller B, and the output end of the first LED driving controller B is connected with the LED lamp B; the output end of the first analog-to-digital converter C is connected with the input end of the first signal modulator C, the output end of the first signal modulator C is connected with the input end of the first LED driving controller C, and the output end of the first LED driving controller C is connected with the LED lamp C.
The LiFi AP end receiving device comprises a first PD receiver, the output end of the first PD receiver is connected with the input end of a first amplifier, the output end of the first amplifier is respectively connected with the input end of a first signal demodulator and the input end of a ranging module, and the output end of the first signal demodulator is connected with a first coding processor through a first digital-to-analog converter.
The LiFi terminal sending device comprises a second coding memory, the output end of the second coding memory is connected with the input end of a second analog-to-digital converter, the output end of the second analog-to-digital converter is connected with the input end of a second signal modulator, the output end of the second signal modulator is connected with the input end of a second LED driving controller, and the output end of the second LED driving controller is connected with an infrared LED lamp.
The LiFi terminal receiving device comprises a second PD receiver, the second PD receiver is connected with the input end of a second signal demodulator through a second amplifier, the input end of the second signal demodulator is respectively connected with the input end of a second digital-to-analog converter and the input end of a second signal modulator, and the output end of the second digital-to-analog converter is connected with a second coding processor.
In addition to the above embodiments, the present invention also includes other embodiments, and all technical solutions that are formed by equivalent transformation or equivalent substitution should fall within the protection scope of the claims of the present invention.
Claims (6)
1. A multi-LED transmitting end positioning method based on LiFi technology is characterized in that: the method comprises the following steps:
(1) The LiFi terminal transmits a positioning request to the LiFi AP receiving end, and simultaneously transmits a time interval delta t of terminal modulation and demodulation and a terminal ID to the AP;
(2) The AP allocates the appointed downlink measurement time slot SL according to the reporting terminal ID i ；
(3) The AP transmits the known S in the designated measurement slot t Signal, S t The signal is sent to the terminal receiver PD through a plurality of visible light LEDs and is simultaneously sent to the AP ranging module;
(4) The terminal opens the switch K to demodulate S in the appointed measurement time slot r The signal is sent to the modulator, and is sent to the AP receiving end through the infrared LED, and the infrared LED signal is amplified by the amplifier and then is sent to the AP ranging module;
(5) The AP ranging module is according to the known S t The signal and the received amplified infrared LED signal are subjected to coherent operation and the time delta t of terminal modulation and demodulation is subtracted to obtain the time difference delta trx between transmission and reflection, and the corresponding distance d is calculated through delta trx X-AP ，d X-AP = ((Δtrx- Δt)/2) speed of light;
(6) AP end-to-multiple distances d X-AP And carrying out space trigonometric operation to obtain the space position, namely the distance and azimuth relation, of the terminal.
2. The method for positioning the multi-LED emitter based on the lif technology according to claim 1, wherein: step (4) the step S r The signal transmission time is determined by the ranging procedure.
3. The method for positioning the multi-LED emitter based on the lif technology according to claim 1, wherein: the coherent operation in step (5) is deconvolution calculation.
4. The method for positioning the emitting ends of the multiple LEDs based on LiFi technology according to claim 1, wherein the method is characterized in thatIn the following steps: step (5) the time difference Deltatrx is used to synchronize the AP clock T AP And clock T of terminal TE ，T TE =T AP -[(Δtrx-Δt)/2]。
5. A multi-LED emitter positioning system based on LiFi technology, employing the positioning method according to any one of claims 1 to 4, characterized in that: the LiFi AP terminal comprises a transmitting device and a receiving device, wherein the transmitting device of the LiFi AP terminal is 3 groups or more, and the receiving device of the LiFi AP terminal is 1 group; the LiFi AP end transmitting device comprises a first coding memory, wherein the output end of the first coding memory is respectively connected with the input end of a first analog-to-digital converter and the input end of a ranging module, the output end of the first analog-to-digital converter is connected with the input end of a first signal modulator, the output end of the first signal modulator is connected with the input end of a first LED driving controller, and the output end of the first LED driving controller is connected with an LED lamp; the LiFi AP end receiving device comprises a first PD receiver, the output end of the first PD receiver is connected with the input end of a first amplifier, the output end of the first amplifier is respectively connected with the input end of a first signal demodulator and the input end of a ranging module, and the output end of the first signal demodulator is connected with a first coding processor through a first digital-to-analog converter.
6. The LiFi technology-based multi-LED emitter location system of claim 5, wherein: the LiFi terminal sending device comprises a second coding memory, a second analog-to-digital converter, a second signal modulator, a second LED driving controller and an infrared LED lamp; the LiFi terminal receiving device comprises a second PD receiver, a second amplifier, a second signal demodulator, a second digital-to-analog converter and a second coding processor.
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| US9335415B2 (en) * | 2012-10-31 | 2016-05-10 | The Boeing Company | Modulated laser range finder and method |
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| CN103959091A (en) * | 2012-08-30 | 2014-07-30 | 索弗特凯耐提克传感器股份有限公司 | TOF illumination system and TOF camera and operation method, with control means for driving electronic devices located in the scene |
| CN207339855U (en) * | 2016-10-26 | 2018-05-08 | 意法半导体(R&D)有限公司 | Device and communication system based on single-photon avalanche diode |
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