CN110133685B - OCC-based detailed positioning communication system for mobile phones assisted by street lamps - Google Patents

Abstract

The present invention relates to an OCC-based street lamp assisted mobile phone detailed positioning communication system. The background operation center of the system uploads the detailed positioning web page information corresponding to the position of each LED street lamp, the web page URL address generated by registration and its web page code to the server , and send the URL address of each web page to the corresponding LED street lamp; the LED street lamp encodes according to the URL address of the web page to generate a modulation signal, and drives the LED light to flash at high speed according to the modulation signal; the browser App of the mobile terminal calls the mobile phone camera to obtain a video and Decipher the URL address of the webpage, and receive detailed positioning webpage information of the URL address of the webpage from the server through the 4G and 5G interfaces. The present invention can use street lamps to assist the mobile phone to carry out detailed positioning, and the mobile phone camera is called to receive the URL address of the webpage through the browser App to display the specific house number information of the houses near the street.

Description

OCC-based detailed positioning communication system for mobile phones assisted by street lamps

technical field

The invention belongs to the technical field of visible light imaging communication, and relates to an OCC-based street lamp-assisted detailed positioning communication system for mobile phones.

Background technique

With the rapid development of LED lights and the popularization of mobile phone cameras, visible light imaging communication technology (Optical camera communication) has developed rapidly in recent years. The sending end uses the existing LED light, and the receiving end uses the mobile phone camera. Compared with the high price of visible light communication (VLC) equipment and infrared equipment, the cost of OCC technology is only some virtual software, there is no equipment cost, only development cost, and it is easier to popularize. In addition, as a branch of VLC technology, OCC technology also has the advantages of VLC technology: 1. The visible light band is not regulated by the Radio Regulation Act, and no application is required for the use of its band. 2. Visible light radiation as a lighting source will not cause harm to the human body. 3. Modem does not require complex calculations, which is suitable for Internet of Things (IoT) devices.

With the continuous maturity of mobile phone GPS positioning technology, specific street positioning can already be realized. However, a more accurate house number location is still not possible.

Contents of the invention

The technical problem to be solved by the present invention is to provide an OCC-based street lamp-assisted detailed positioning communication system for mobile phones. This system uses the existing LED street lamps and mobile phone terminals to give full play to the advantages of OCC technology, and can more accurately locate house numbers. position.

In order to solve the above-mentioned technical problems, the OCC-based street lamp auxiliary mobile phone detailed positioning communication system of the present invention includes a background operation center, a plurality of LED street lamps, a mobile phone terminal with a camera function, and a server; the background operation center will correspond to the positions of each LED street lamp The detailed positioning web page information, the web page URL address generated by registration and the web page code are uploaded to the server, and the URL address of each web page is sent to the corresponding LED street lamp through wireless communication; the LED street lamp includes a street lamp side wireless communication module, which stores Unit, control unit, LED driver module and LED lights; the URL address of the webpage sent by the background operation center is stored in the storage unit; the control unit generates a modulation signal according to the encoding of the URL address of the webpage in the storage unit, and controls the LED driver module according to the modulation signal Drive the LED light to flash at high speed; the browser App of the mobile terminal calls the mobile phone camera to obtain a video and extract the URL address of the webpage, and receives the detailed positioning webpage information of the URL address of the webpage from the server through the 4G or 5G interface.

The background operation center can also send simple text information corresponding to the position of the LED street lamp to the corresponding LED street lamp through wireless communication.

The mobile phone terminal decodes the simple text information corresponding to the position of the LED street lamp according to the acquired video.

The detailed positioning webpage information includes specific house number information of buildings near the street.

The detailed positioning web page information also includes the street culture information of each LED street lamp, nearby characteristic tourist information and advertisement information.

The method that the mobile phone terminal obtains the web page URL address according to the LED street lamp video information taken is as follows:

First, the browser App calls the mobile phone camera to obtain a video; then, divides the video into frames and converts each frame into a grayscale image; compares the average grayscale value of the light source area of each frame image with the set threshold, Determine the light and dark state of the light source as the 01 sequence code; use a pilot in the video to determine the position of the LED light in the image; judge whether the positioning of the LED light is successful, if it fails, re-acquire the video, and continue processing if it succeeds; according to the pilot The 01 serial code is decoded from the light and dark state of the subsequent LED light; the URL address of the webpage is decoded according to the 01 serial code.

Beneficial effects of the present invention:

When an individual is looking for a designated destination, the GPS map positioning of the mobile phone can only locate the designated street. The present invention can use the street lamp to assist the mobile phone to carry out detailed positioning, call the mobile phone camera through the browser App to receive the URL address of the webpage, to display the specific house number information of the houses near the street, compare the scenery around the LED street lamp, realize detailed positioning, and then find the destination without having to Worried about not being able to find a specific destination, and wasting time walking up and down the streets. In addition, the webpage is not limited to detailed positioning information, but may also include block cultural information, nearby characteristic tourist information and advertisement information, and release more characteristic information near the block while realizing detailed positioning.

Description of drawings

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

Fig. 1 is a block diagram of an OCC-based detailed positioning communication system for a mobile phone based on OCC.

Reference numerals in Figure 1 include:

1-background operation center 2-LED street lamp 3-mobile terminal 4-server.

Figure 2 is a flow chart of the mobile terminal program.

Detailed ways

Preferred embodiments of the present invention are described in detail as follows:

As shown in FIG. 1 , the OCC-based street lamp-assisted mobile phone detailed positioning communication system of the present invention includes a background operation center 1 , LED street lamps 2 , a mobile phone terminal 3 with a camera function, and a server 4 .

The background operation center 1 includes a webpage content storage module and a background side wireless communication module; the webpage content corresponding to each LED street lamp 2 position written by the operator, including detailed positioning webpage information, webpage URL address and webpage code generated by registration, are stored in Web page content storage module; wherein the detailed positioning web page information includes the specific house number information of buildings near the street where the LED street lamp 2 is located, block culture information, nearby characteristic tourism information and advertising information, etc.; the detailed positioning web page corresponding to each LED street lamp 2, registration generated The URL address of the webpage and the webpage code thereof are uploaded to the server 4 . The webpage URL address stored in the webpage content storage module is sent to the corresponding LED street lamp 2 through the background side wireless communication module.

The information sent to the LED street lamp 2 through the background side wireless communication module is not limited to the URL address of the web page, but can also include simple text information (such as the street location of the LED street lamp 2, house number, text description and the like).

The LED street lamp 2 includes a street lamp side wireless communication module, a storage unit, a control unit, an LED driver module and an LED lamp. The wireless communication module on the street lamp side receives the URL address of the web page sent from the background operation center 1, and stores it in the storage unit; the control unit encodes the URL address of the web page in the storage unit to generate a modulation signal, and controls the LED driver module to drive the LED according to the modulation signal The light flashes at high speed without flickering.

The high-speed flashing of the LED light transmits the URL address of the webpage carried to the mobile phone terminal 3 through the optical channel, and the OCC technology is used to transmit information by controlling the high-speed flashing of the LED light. The light and dark state of the high-speed flashing can be captured by the mobile phone camera. The mobile phone parses out the URL address of the web page transmitted by the LED light through the browser App. Compared with the high price of visible light communication equipment and infrared equipment, the cost of OCC technology is only some virtual software, there is no equipment cost, only development cost, and it is easier to popularize.

The mobile phone terminal 3 needs to include a camera function. By extending the OCC function of the browser App, calling the mobile phone camera function, receiving the URL address of the webpage from the LED street lamp, and returning to the browser App to display the detailed positioning page, the mobile terminal 3 is based on The URL address of the webpage, through the 4G or 5G interface, receives the webpage content of the detailed positioning webpage from the server, the specific house number information of the buildings near the street where the LED street light 2 is located, the cultural information of the block, nearby characteristic tourist information and advertising information, etc.

Smart phones have been widely popularized, and what users need to spend is only the short time required to download an App processing software. Therefore, the present invention is easy to be popularized and applied on the user side due to its characteristics of low cost, convenience and quickness.

The mobile terminal 3 uses the URL address of the webpage in combination with the 4G or 5G interface to receive complex webpage content information from the server for locating the webpage in detail. The content of the webpage is not limited to detailed positioning information, but can also include block cultural information, nearby characteristic tourist information, and advertising information. While achieving detailed positioning, more characteristic information near the block can be released. At present, the publicity methods of nearby characteristic information are limited to distributing leaflets and posting sticker advertisements, which not only affects the city appearance, but also wastes timber resources. The present invention utilizes the existing LED street lamp 2 and mobile phone terminal 3 to give full play to the advantages of OCC technology, send some additional information about the location to mobile phone users, and virtualize the publicity method, which can not only promote the economic development of nearby characteristic industries, but also Beautify the city appearance without causing some waste in physical publicity.

As shown in Figure 2, the flow chart of the mobile terminal program is as follows:

First, the browser App calls the mobile phone camera to obtain a video; then, divides the video into frames; then converts each frame into a grayscale image, and the brightness value of each pixel is from 0 to 255; A pilot frequency, use it to determine the position of the LED light in the image; judge whether the positioning of the LED light is successful, if not successful, re-acquire the video, if successful, continue processing; compare the average gray value of the light source area of each frame image with the set threshold In comparison, the light and dark state of the light source is determined as the 01 sequence code; the 01 sequence code is solved according to the light and dark state of the LED light following the pilot; finally, the URL address of the web page is solved according to the 01 sequence code.

Light source positioning problem: At present, there are many solutions to the light source positioning problem. The present invention takes the image difference method as an example and uses two pilot symbol signals for positioning. The two pilot symbol signals are 1 and 0 respectively. One symbol signal is transmitted by one frame picture, then these two symbol signals will be presented in two pictures, one light source is bright and the other light source is dark. Furthermore, by making a difference between the two pictures, the difference between the two pictures will be found, that is, the position of the light source, so as to achieve positioning.

The problem of flickering of light sources: If the frequency of light flickering is very slow, flickering will occur. Therefore, in order to solve this problem, many undersampling schemes have been proposed, such as undersampling frequency shift keying, undersampling phase shift keying, undersampling amplitude modulation, and so on.

The present invention is explained by under-sampling phase-shift keying. In order to avoid the problem of stroboscopic flicker, we make the light source at the sending end flicker at high speed, that is, send a high-frequency square wave. Each symbol occupies several square wave signals, the initial waveform of codeword 1 is 1, and the initial waveform of codeword 0 is 0. The mobile phone camera samples at equal intervals in the way of global exposure, and you can get different sampling results of 0 and 1. It can not only solve the stroboscopic problem, but also transmit data correctly.

Visible light imaging communication has two main research directions. One is the OCC communication system based on global exposure, the communication distance can reach more than 10 meters, but the communication rate is relatively slow. The other is the OCC communication system based on rolling shutter exposure, the communication distance is within 2 meters, but the communication speed is relatively fast. At present, the height of street lamps is generally between 4 meters and 10 meters, so the present invention can be implemented in the way of global exposure.

At present, LED street lights, building door lights and lighting decorations on buildings are all over the corners of the city. It is completely possible to use the existing LED lights to realize the detailed positioning of mobile phones assisted by LED lights. In addition, the OCC technology is used to communicate between the LED light and the mobile phone, and the user only spends the short time required to download the App processing software. Therefore, the street lamp-assisted mobile phone detailed positioning communication system is more likely to be popularized and applied on the user side due to its low cost, convenience and quickness. Furthermore, the GPS positioning of radio frequency communication mobile phones can obtain street information near the destination in a wide range, but OCC technology must be within the light range to communicate. Only under LED lights can the specific information of houses near the LED lights be obtained. House number information, compared with the surrounding scenery of LED lights, so as to achieve more specific positioning. Through the combination of LED lights and OCC technology, greater benefits can be brought into play, but such an OCC communication system has not been reported yet. The invention is suitable for covering all major streets, and the cost is relatively low. The detailed implementation process of the present invention has been described above in conjunction with the accompanying drawings, but the present invention is not only used for assisting detailed positioning of mobile phones. It can also display street culture, nearby characteristic tourist information and advertising information according to the URL address of the web page. As long as it conforms to the idea of using LED street lamps to send information to mobile phones in the present invention, as long as it does not deviate from the principle of the visible light imaging street lamp communication system, it all belongs to the scope of protection of the present invention. .

Claims (5)

1. a mobile phone detailed positioning communication system based on OCC street lamp is characterized in that comprising background operation center (1), a plurality of LED street lamps (2), mobile phone terminal (3) and server (4) with camera function; The background operation center (1) uploads the detailed positioning webpage information corresponding to each LED street lamp (2) position, the webpage URL address and webpage code generated by registration to the server (4), and uploads each webpage URL to the server (4) through wireless communication. The address is sent to the corresponding LED street lamp (2); the LED street lamp (2) includes a street lamp side wireless communication module, a storage unit, a control unit, an LED driver module and an LED lamp; the URL address of the webpage sent by the background operation center (1) is stored into the storage unit; the control unit encodes the URL address of the webpage in the storage unit to generate a modulation signal, and controls the LED driver module to drive the LED light to flash at a high speed according to the modulation signal; the browser App of the mobile terminal (3) calls the mobile phone camera to obtain a section of video And solve the webpage URL address, receive the detailed positioning webpage information of the webpage URL address from the server (4) through the 4G or 5G interface; The method that the mobile phone terminal (3) obtains the webpage URL address according to the LED street lamp video information taken is as follows: First, the browser App calls the mobile phone camera to obtain a video; then, divides the video into frames and converts each frame into a grayscale image; compares the average grayscale value of the light source area of each frame image with the set threshold, Determine the light and dark state of the light source as the 01 sequence code; use a pilot in the video to determine the position of the LED light in the image; judge whether the positioning of the LED light is successful, if it fails, re-acquire the video, and continue processing if it succeeds; according to the pilot The 01 serial code is decoded from the light and dark state of the subsequent LED light; the URL address of the webpage is decoded according to the 01 serial code. 2. The OCC-based street lamp assisted mobile phone detailed positioning communication system according to claim 1, characterized in that the background operation center (1) can also send simple text information corresponding to the position of the LED street lamp (2) through wireless communication The mode is sent to the corresponding LED street lamp (2). 3. The OCC-based street lamp assisted mobile phone detailed positioning communication system according to claim 2, characterized in that the simple text information corresponding to the position of the LED street lamp (2) is solved according to a section of video obtained by the mobile phone terminal (3) . 4. The OCC-based street lamp-assisted detailed positioning communication system for mobile phones according to claim 1, wherein the detailed positioning web page information includes specific house number information of buildings near the street. 5. according to claim 4 based on the OCC-based street lamp auxiliary mobile phone detailed positioning communication system, it is characterized in that described detailed positioning webpage information also includes the block culture information of each LED street lamp (2) position, nearby characteristic tourist information and advertising information.

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