CN105827314A - Visible light communication positioning system and method - Google Patents

Abstract

The present application provides a visible light communication positioning system and method. The visible light communication positioning system includes: each visible light signal source is used to transmit the visible light signal with its own ID; the visible light signal source, transmit the visible light signal, convert the received visible light signal into a first electrical signal, and send the first electrical signal to the terminal server; the terminal server is used to parse the ID from the first electrical signal, and will The coverage area of the visible light signal source corresponding to the ID analyzed in the first electrical signal is used as the location area of the mobile terminal, and the location area of the mobile terminal is displayed. In this application, no matter indoors or outdoors, as long as there is a visible light signal source (such as an electric light), positioning can be realized. And in the positioning process, the visible light signal will not be interfered by other radio signals, and the positioning accuracy is high.

Description

A positioning system and method for visible light communication

technical field

The present application relates to the field of mobile positioning, and in particular to a visible light communication positioning system and method.

Background technique

In recent years, with the increase of user demands, the application of mobile positioning technology has become more and more extensive. Among them, mobile positioning technology can be used to locate people, events, and objects to meet the positioning needs of industries such as emergency rescue and help, mobile law enforcement, mobile office, transportation, logistics, tourism, and land and resources investigation.

Current mobile positioning methods mainly include: GPS positioning and Wi-Fi (Wireless-Fidelity, wireless network) positioning. However, GPS positioning cannot be applied to indoor positioning. Although Wi-Fi positioning can be applied to indoor and outdoor positioning, it is susceptible to interference from other radio signals and affects positioning accuracy.

Contents of the invention

In order to solve the above technical problems, the embodiments of the present application provide a visible light communication positioning system and method, so as to achieve positioning as long as there is a visible light signal source (such as a lamp) no matter indoors or outdoors, and during the positioning process, The visible light signal will not be interfered by other radio signals, and the positioning accuracy is high. The technical solution is as follows:

A positioning system for visible light communication, comprising: a terminal server, at least one mobile terminal, and multiple visible light signal sources, each of which has a different ID number ID;

The terminal server is respectively connected to each of the visible light signal sources;

Each of the visible light signal sources is respectively used to emit a visible light signal carrying its own ID;

The mobile terminal is configured to receive the visible light signal emitted by the visible light signal source corresponding to the visible light coverage area where it is located, convert the received visible light signal into a first electrical signal, and send the first electrical signal to the terminal server;

The terminal server is configured to assign different IDs to each visible light signal source, and receive the first electrical signal sent by the mobile terminal, parse out the ID from the first electrical signal, and determine the ID from the first electrical signal. The visible light signal source corresponding to the ID parsed from the signal, using the coverage area of the visible light signal source corresponding to the ID parsed from the first electrical signal as the location area of the mobile terminal, and displaying the location area of the mobile terminal location area.

Preferably, any one of the multiple visible light signal sources includes: a driving circuit and a visible light emitting device;

The drive circuit is configured to encode and modulate the ID of the visible light signal source to obtain a first modulated signal, and convert the first modulated signal into a visible light signal;

The visible light emitting device is used to emit the visible light signal;

The mobile terminal includes: a visible light receiving device, a receiving circuit and a sending module;

The visible light receiving device is used to receive the visible light signal emitted by the visible light signal source corresponding to the visible light coverage area where it is located;

The receiving circuit is configured to convert the received visible light signal into a second electrical signal, and demodulate and modulate the second electrical signal to obtain a first electrical signal;

The sending module is configured to send the first electrical signal to the terminal server.

Preferably, the drive circuit includes:

A sub-drive circuit, configured to perform Manchester encoding and binary on-off keying OOK modulation on the ID of the visible light signal source to obtain a first modulation signal, and convert the first modulation signal into a visible light signal;

The receiving circuit includes: a sub-receiving circuit, configured to convert the received visible light signal into a second electrical signal, and perform Manchester decoding and OOK demodulation on the second electrical signal to obtain the first electrical signal.

Preferably, the visible light emitting device is an LED lamp;

The visible light receiving device is a photodetector.

Preferably, the mobile terminal is a mobile phone.

Preferably, the mobile terminal is a tablet computer.

Preferably, the mobile terminal is a notebook computer.

A visible light communication positioning method, based on a visible light communication positioning system, the visible light communication positioning system includes: a terminal server, a mobile terminal, and a plurality of visible light signal sources, each of the visible light signal sources has a different ID, and the terminal servers are respectively Connected to each of the visible light signal sources, the terminal server is configured to assign different IDs to each visible light signal source;

Each of the visible light signal sources emits a visible light signal with its own ID;

The mobile terminal receives the visible light signal emitted by the visible light signal source corresponding to the visible light coverage area where it is located;

The mobile terminal converts the received visible light signal into a first electrical signal;

The mobile terminal sends the first electrical signal to the terminal server;

The terminal server receives the first electrical signal sent by the mobile terminal;

The terminal server parses the ID from the first electrical signal, and determines a visible light signal source corresponding to the ID parsed from the first electrical signal;

The terminal server uses the coverage area of the visible light signal source corresponding to the ID parsed from the first electrical signal as the location area of the mobile terminal, and displays the location area of the mobile terminal.

Preferably, the process for each of the visible light signal sources to respectively transmit visible light signals carrying their respective IDs includes:

Each of the visible light signal sources encodes and modulates their respective IDs to obtain a first modulated signal, and converts the first modulated signal into a visible light signal;

Each of the visible light signal sources respectively emits a visible light signal;

The process of converting the received visible light signal into the first electrical signal by the mobile terminal includes:

The mobile terminal converts the received visible light signal into a second electrical signal, and demodulates and modulates the second electrical signal to obtain the first electrical signal.

Preferably, each of the visible light signal sources encodes and modulates their respective IDs to obtain a first modulated signal, and the process of converting the first modulated signal into a visible light signal includes:

Each of the visible light signal sources performs Manchester encoding and OOK modulation on their respective IDs to obtain a first modulation signal, and converts the first modulation signal into a visible light signal;

The mobile terminal converts the received visible light signal into a second electrical signal, and demodulates and modulates the second electrical signal to obtain the first electrical signal, including:

The mobile terminal converts the received visible light signal into a second electrical signal, and performs Manchester decoding and OOK demodulation on the second electrical signal to obtain the first electrical signal.

Compared with the prior art, the beneficial effects of the present application are:

In this application, the mobile terminal receives the visible light signal carrying the ID, converts the visible light signal carrying the ID into a first electric signal, sends the first electric signal to the terminal server, and the terminal server extracts the first electric signal from the first electric signal. The ID is parsed, so as to determine the coverage area of the visible light signal source corresponding to the ID parsed from the first electrical signal, and use it as the location area of the mobile terminal to realize positioning through visible light communication. Among them, whether it is indoor or outdoor, as long as there is a visible light signal source (such as a lamp), positioning can be realized. And during the positioning process, the visible light signal will not be interfered by other radio signals, and the positioning accuracy is high.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, other drawings can also be obtained based on these drawings without any creative effort.

Fig. 1 is a schematic diagram of a logical structure of the visible light communication positioning system provided by the present application;

Fig. 2 is a schematic diagram of a logical structure of the visible light signal source provided by the present application;

FIG. 3 is a schematic diagram of a logical structure of a mobile terminal provided by the present application;

Fig. 4 is a schematic diagram of a physical structure of the visible light communication positioning system provided by the present application;

Fig. 5 is a flow chart of the VLC positioning method provided by the present application.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

Embodiment one

Please refer to FIG. 1 , which shows a schematic diagram of a logical structure of a visible light communication positioning system provided by the present application. The visible light positioning system includes: a terminal server, at least one mobile terminal, and multiple visible light signal sources. In FIG. 1 , a plurality of visible light signal sources are denoted as L1, L2, . . . , Ln, respectively.

In this embodiment, the ID (identification number) addresses of the visible light signal sources are different.

The terminal server is respectively connected to each of the visible light signal sources.

Each visible light signal source is used to transmit the visible light signal carrying its own ID.

The mobile terminal is configured to receive the visible light signal emitted by the visible light signal source corresponding to the visible light coverage area where it is located, convert the received visible light signal into a first electrical signal, and send the first electrical signal to the terminal server.

In this embodiment, the mobile terminal performs visible light communication by receiving the visible light signal transmitted by the visible light signal source corresponding to the visible light coverage area where it is located, and the visible light signal source corresponding to the visible light coverage area where it is located.

In this embodiment, the mobile terminal uses its built-in antenna to send the first electrical signal to the terminal server.

The terminal server is configured to assign different IDs to each visible light signal source, and receive the first electrical signal sent by the mobile terminal, parse out the ID from the first electrical signal, and determine the ID from the first electrical signal. The visible light signal source corresponding to the ID parsed from the signal, using the coverage area of the visible light signal source corresponding to the ID parsed from the first electrical signal as the location area of the mobile terminal, and displaying the location area of the mobile terminal location area.

In this application, the mobile terminal receives the visible light signal carrying the ID, converts the visible light signal carrying the ID into a first electric signal, sends the first electric signal to the terminal server, and the terminal server extracts the first electric signal from the first electric signal. The ID is parsed, so as to determine the coverage area of the visible light signal source corresponding to the ID parsed from the first electrical signal, and use it as the location area of the mobile terminal to realize positioning through visible light communication. Among them, whether it is indoor or outdoor, as long as there is a visible light signal source (such as a lamp), positioning can be realized. And during the positioning process, the visible light signal will not be interfered by other radio signals, and the positioning accuracy is high.

Furthermore, since the visible light signal propagates in a straight line in the air, and the intensity attenuates uniformly with the propagation distance, if a person to be located can be irradiated by a beam of light overhead, then the person to be located must be under this beam of light, and the visible light signal The beam irradiation range of the source can be controlled within 1 meter, so the positioning accuracy can be achieved within 1 meter.

It should be noted that if more precise positioning is required, it can be achieved by increasing the number of visible light signal sources.

In this embodiment, since the specific structure of each of the visible light signal sources is the same, only the specific structure of any one of the multiple visible light signal sources will be described. Referring to FIG. 2 , any one of the multiple visible light signal sources includes: a driving circuit and a visible light emitting device.

The driving circuit is used to encode and modulate the ID of the visible light signal source to obtain a first modulated signal, and convert the first modulated signal into a visible light signal.

In this embodiment, the purpose of encoding and modulating the ID of the visible light signal source is to prevent the occurrence of long data strings of continuous "0" or "1" from affecting the normal illumination of the visible light emitting device.

The visible light emitting device is used for emitting visible light signals.

In this embodiment, the driving circuit may specifically include: a sub-driving circuit, configured to perform Manchester encoding and OOK (binary on-off keying, On-OffKeying) modulation on the ID of the visible light signal source to obtain a first modulation signal, and converting the first modulation signal into a visible light signal.

In this embodiment, the digital control of the ID of the visible light signal source is realized by using OOK modulation, and the combination of Manchester encoding and OOK modulation is to improve the accuracy rate of the OOK modulation mode.

In this embodiment, please refer to FIG. 3 for the specific structure of the mobile terminal. The mobile terminal includes: a visible light receiving device, a receiving circuit, and a sending module.

The visible light receiving device is used to receive the visible light signal emitted by the visible light signal source corresponding to the visible light coverage area where it is located;

The receiving circuit is used to convert the received visible light signal into a second electrical signal, and demodulate and modulate the second electrical signal to obtain the first electrical signal.

A sending module, configured to send the first electrical signal to the terminal server.

In this embodiment, the receiving circuit specifically includes: a sub-receiving circuit, configured to convert the received visible light signal into a second electrical signal, and perform Manchester decoding and OOK demodulation on the second electrical signal to obtain the first electrical signal Signal.

In the above visible light communication positioning system, the visible light emitting device is specifically an LED lamp. And, the visible light receiving device is specifically a photodetector.

In this embodiment, an example is now used to describe the positioning process of the visible light communication positioning system. Please refer to FIG. 4, which shows a schematic diagram of an entity structure of the visible light communication positioning system provided by this application. Connected to LED light 1, LED light 2, LED light 3 and LED light 4 respectively, the mobile terminal is in the visible light coverage area of LED light 1, and the mobile terminal can receive the visible light signal emitted by LED light 1, and transmit the received visible light signal The signal is converted into a first electrical signal, and the first electrical signal is sent to the terminal server. The terminal server receives the first electrical signal sent by the mobile terminal, parses out the ID from the first electrical signal, and determines the The LED lamp 1 corresponding to the ID is obtained, and the coverage area of the LED lamp 1 corresponding to the ID analyzed from the first electrical signal is used as the location area of the mobile terminal, and the location area of the mobile terminal is displayed.

In the above visible light communication positioning system, the mobile terminal may specifically be, but not limited to: a mobile phone, a tablet computer or a notebook computer.

In this application, the visible light communication positioning system can be applied in places such as communities, hospitals, and shopping malls. When people are in danger, precise positioning can be carried out, so that the rescuers can quickly rescue the rescuers and track the criminals.

Among them, LED lights are used as visible light signal sources to provide lighting services while positioning, and the power consumption of LED lights is low, so that the overall power consumption of the visible light communication positioning system is low.

Since the visible light communication positioning system does not generate any radio frequency interference, has no radiation damage to the human body, and is healthy and safe, it can be deployed in environments where radio frequency radiation is strictly limited (such as hospitals).

Since the visible light signal is less affected by the environment, and the visible light signal is transmitted one-to-one along a straight line, the confidentiality of the visible light signal is strong during transmission.

Of course, the visible light communication positioning system can be closely integrated with the fire protection system, which can greatly reduce the blindness of on-site command; in the government and military industry departments, the system transmits information in a straight line, and when making an emergency call, LED lights can be used for information transmission. Accurately locate the victim's location for timely rescue. Provide services for personnel tracking in the security department, location monitoring in the fire department, etc.

In the shopping mall, because the items are more expensive, criminals are malicious. In case of robbery, the visible light communication positioning system can be used to locate directly without dialogue, which saves unnecessary trouble and reduces the risk of victimization.

The visible light communication positioning system can be closely integrated with the emergency medical system, so that the ambulance system can use visible light to locate the location of the emergency patient through a telephone call, so that the doctor can quickly find the patient's location, treat it, and avoid serious medical accidents.

Embodiment two

In an embodiment, a visible light communication positioning method is provided, based on a visible light communication positioning system, the visible light communication positioning system includes: a terminal server, a mobile terminal, and multiple visible light signal sources, each of which has a different ID Similarly, the terminal server is respectively connected to each of the visible light signal sources, and the terminal server is configured to assign different IDs to each visible light signal source.

Please refer to Fig. 5, which shows a flow chart of the VLC positioning method provided by this application, which may include the following steps:

Step S51: Each of the visible light signal sources transmits a visible light signal carrying its own ID.

In this embodiment, each of the visible light signal sources transmits a visible light signal carrying its own ID, specifically: each of the visible light signal sources codes and modulates their respective IDs to obtain a first modulated signal, and converting the first modulated signal into a visible light signal;

Each of the visible light signal sources respectively emits visible light signals.

Wherein, each of the visible light signal sources encodes and modulates their respective IDs to obtain a first modulated signal, and converts the first modulated signal into a visible light signal. The ID is Manchester encoded and OOK modulated to obtain a first modulated signal, and the first modulated signal is converted into a visible light signal.

Step S52: The mobile terminal receives the visible light signal emitted by the visible light signal source corresponding to the visible light coverage area where it is located.

Step S53: the mobile terminal converts the received visible light signal into a first electrical signal.

In this embodiment, the process of converting the received visible light signal into the first electrical signal by the mobile terminal is specifically:

The mobile terminal converts the received visible light signal into a second electrical signal, and demodulates and modulates the second electrical signal to obtain the first electrical signal.

Wherein, the mobile terminal converts the received visible light signal into a second electrical signal, and demodulates and modulates the second electrical signal to obtain the first electrical signal, specifically:

The mobile terminal converts the received visible light signal into a second electrical signal, and performs Manchester decoding and OOK demodulation on the second electrical signal to obtain the first electrical signal.

Step S54: the mobile terminal sends a first electrical signal to the terminal server.

Step S55: The terminal server receives the first electrical signal sent by the mobile terminal.

Step S56: The terminal server parses out the ID from the first electrical signal, and determines a visible light signal source corresponding to the ID parsed from the first electrical signal.

Step S57: The terminal server uses the coverage area of the visible light signal source corresponding to the ID parsed from the first electrical signal as the location area of the mobile terminal, and displays the location area of the mobile terminal.

It should be noted that each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. For the same and similar parts in each embodiment, refer to each other, that is, Can. For the device-type embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and for related parts, please refer to part of the description of the method embodiments.

Finally, it should also be noted that in this text, relational terms such as first and second etc. are only used to distinguish one entity or operation from another, and do not necessarily require or imply that these entities or operations, any such actual relationship or order exists. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or device. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

The above is a detailed introduction of a visible light communication positioning system and method provided by this application. In this paper, specific examples are used to illustrate the principle and implementation of this application. The description of the above embodiment is only used to help understand the application. method and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of this application, there will be changes in the specific implementation and application scope. Application Restrictions.

Claims (10)

1. a visible light communication alignment system, it is characterised in that including: terminal server, at least one mobile terminal and multiple visible light signal source, the identity ID in each described visible light signal source is different；

Described terminal server is connected with visible light signal source each described respectively；

Each described visible light signal source, is respectively used to launch the visible light signal carrying respective ID；

Described mobile terminal, for receiving the visible light signal source that visible ray overlay area residing for it is corresponding, the visible light signal of transmitting, and is converted to first signal of telecommunication by the visible light signal received, and sends described first signal of telecommunication to described terminal server；

Described terminal server, for the ID different to the distribution of each visible light signal source, and receive first signal of telecommunication that described mobile terminal sends, ID is parsed from described first signal of telecommunication, and determine the visible light signal source corresponding for ID parsed from described first signal of telecommunication, the overlay area in visible light signal source corresponding for ID that will parse from described first signal of telecommunication, as the band of position of described mobile terminal, and shows the band of position of described mobile terminal.

System the most according to claim 1, it is characterised in that any one the visible light signal source in multiple described visible light signal sources includes: drive circuit and VISIBLE LIGHT EMISSION device；

Described drive circuit, for the ID in visible light signal source is carried out coded modulation, obtains the first modulated signal, and described first modulated signal is converted to visible light signal；

Described VISIBLE LIGHT EMISSION device, is used for launching described visible light signal；

Described mobile terminal includes: visible optical pickup apparatus, reception circuit and sending module；

Described visible optical pickup apparatus, for receiving the visible light signal source that visible ray overlay area residing for it is corresponding, the visible light signal of transmitting；

Described reception circuit, for the visible light signal received is converted to second signal of telecommunication, and is demodulated modulation, obtains first signal of telecommunication described second signal of telecommunication；

Described sending module, is used for sending described first signal of telecommunication to described terminal server.

System the most according to claim 2, it is characterised in that described drive circuit includes:

Sub-drive circuit, for the ID in described visible light signal source carries out Manchester's code and binary system on off keying OOK modulation, obtains the first modulated signal, and described first modulated signal is converted to visible light signal；

Described reception circuit includes: sub-reception circuit, for the visible light signal received is converted to second signal of telecommunication, and described second signal of telecommunication carries out manchester decoder and OOK demodulation, obtains first signal of telecommunication.

System the most according to claim 2, it is characterised in that described VISIBLE LIGHT EMISSION device is LED；

Described visible optical pickup apparatus is photodetector.

5. according to the system described in claim 1-4 any one, it is characterised in that described mobile terminal is mobile phone.

6. according to the system described in claim 1-4 any one, it is characterised in that described mobile terminal is panel computer.

7. according to the system described in claim 1-4 any one, it is characterised in that described mobile terminal is notebook computer.

8. a visible light communication localization method, it is characterized in that, based on visible light communication alignment system, described visible light communication alignment system includes: terminal server, mobile terminal and multiple visible light signal source, the ID in each described visible light signal source is different, described terminal server is connected with visible light signal source each described respectively, described terminal server, for the ID different to the distribution of each visible light signal source；

Each described visible light signal source, launches the visible light signal carrying respective ID respectively；

Described mobile terminal receives the visible light signal source that visible ray overlay area residing for it is corresponding, the visible light signal of transmitting；

The visible light signal received is converted to first signal of telecommunication by described mobile terminal；

Described mobile terminal sends described first signal of telecommunication to described terminal server；

Described terminal server receives first signal of telecommunication that described mobile terminal sends；

Described terminal server parses ID from described first signal of telecommunication, and determines the visible light signal source corresponding for ID parsed from described first signal of telecommunication；

The overlay area in visible light signal source corresponding for ID that described terminal server will parse from described first signal of telecommunication, as the band of position of described mobile terminal, and shows the band of position of described mobile terminal.

Method the most according to claim 8, it is characterised in that each described visible light signal source described, launches the process of the visible light signal carrying respective ID respectively, including:

Each described visible light signal source carries out coded modulation to respective ID respectively, obtains the first modulated signal, and described first modulated signal is converted to visible light signal；

Visible light signal is launched in each described visible light signal source respectively；

The visible light signal received is converted to the process of first signal of telecommunication by described mobile terminal, including:

The visible light signal received is converted to second signal of telecommunication by described mobile terminal, and described second signal of telecommunication is demodulated modulation, obtains first signal of telecommunication.

Method the most according to claim 9, it is characterised in that each described visible light signal source carries out coded modulation to respective ID respectively, obtains the first modulated signal, and described first modulated signal is converted to the process of visible light signal, including:

Each described visible light signal source carries out Manchester's code and OOK modulation respectively to respective ID, obtains the first modulated signal, and described first modulated signal is converted to visible light signal；

The visible light signal received is converted to second signal of telecommunication by described mobile terminal, and described second signal of telecommunication is demodulated modulation, obtains the process of first signal of telecommunication, including:

The visible light signal received is converted to second signal of telecommunication by described mobile terminal, and described second signal of telecommunication carries out manchester decoder and OOK demodulation, obtains first signal of telecommunication.