CN110133685A - OCC-based street light-assisted mobile phone detailed positioning communication system - Google Patents

Abstract

The invention relates to an OCC-based street lamp auxiliary mobile phone detailed positioning communication system. The background operation center of the system uploads the detailed positioning webpage information corresponding to the position of each LED street lamp, the webpage URL address generated by registration and the webpage code to the server. and send the URL address of each webpage to the corresponding LED street light; the LED street light is encoded according to the URL address of the webpage 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 The URL address of the webpage is solved, and the detailed positioning webpage information of the URL address of the webpage is received from the server through the 4G and 5G interface. The present invention can use the street lamp to assist the mobile phone to perform detailed positioning, and use the browser App to call the mobile phone camera to receive the URL address of the web page, so as to display the specific house number information of the houses near the street.

Description

OCC-based street light-assisted mobile phone detailed positioning communication system

technical field

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

Background technique

With the rapid development of LED lamps and the popularization of mobile phone cameras, in recent years, optical camera communication has developed rapidly. The sender uses the existing LED lights, and the receiver uses the mobile phone camera. Compared with the high prices 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, OCC technology, as a branch of VLC technology, also has the advantages of VLC technology: 1. The visible light band is not regulated by the Radio Regulation Law, and the use of its band does not require an application. 2. The visible light radiation as the lighting source will not cause harm to the human body. 3. The feature that modulation and demodulation does not require complex calculations is suitable for Internet of Things (IoT) devices.

With the continuous maturity of mobile phone GPS positioning technology, specific street positioning can be achieved. However, more precise house number positioning is still not possible.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide an OCC-based street light-assisted mobile phone detailed positioning communication system. The system utilizes the existing LED street lights and mobile phone terminals to give full play to the advantages of the OCC technology, and can more accurately determine the house number. position.

In order to solve the above technical problems, the OCC-based street light-assisted mobile phone detailed positioning communication system of the present invention includes a background operation center, a plurality of LED street lights, a mobile phone terminal with a camera function, and a server; the background operation center will correspond to the position of each LED street light. The detailed positioning webpage information, the webpage URL address and webpage code generated by registration are uploaded to the server, and each webpage URL address is sent to the corresponding LED street light through wireless communication; the LED street light includes a street light side wireless communication module, storage unit, control unit, LED drive module and LED lamp; the web page URL address sent by the background operation center is stored in the storage unit; the control unit encodes and generates a modulation signal according to the web page URL address in the storage unit, and controls the LED drive module according to the modulation signal Drive the LED lights to flash at high speed; the browser app of the mobile terminal calls the mobile phone camera to obtain a video and decodes the web page URL address, and receives the detailed location web page information of the web page URL address 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 light to the corresponding LED street light through wireless communication.

The simple text information corresponding to the position of the LED street lamp is decoded by the mobile phone terminal according to an 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 cultural information of the block where each LED street light is located, the nearby characteristic tourism information and the advertisement information.

The method that the mobile phone terminal obtains the URL address of the webpage according to the captured LED street light video information is as follows:

First, the browser app calls the mobile phone camera to obtain a video; then, the video is divided into frames of images and each frame is converted into a grayscale image; the average grayscale value of the light source area of each frame is compared with the set threshold, Determine the light and dark state of the light source as the 01 sequence code; use a pilot frequency in the video to determine the position of the LED light in the image; judge whether the LED light positioning is successful, if unsuccessful, re-acquire the video, if successful, continue processing; according to the pilot frequency The 01 serial code is decoded by the subsequent LED light and dark states; the web page URL address 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 light to assist the mobile phone to perform detailed positioning, and use the browser App to call the mobile phone camera to receive the URL address of the web page, so as to display the specific house number information of the houses near the street, compare the scenery around the LED street light, realize the detailed positioning, and then find the destination. Worrying about not finding a specific destination and wasting time walking the streets. In addition, the webpage is not limited to the detailed positioning information, but can also include the cultural information of the block, nearby characteristic tourism information, and advertisement information. While realizing the detailed positioning, more characteristic information near the block is released.

Description of drawings

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

FIG. 1 is a block diagram of a detailed positioning communication system of an OCC-based street light-assisted mobile phone according to the present invention.

Reference numerals in Figure 1 include:

1-Background operation center 2-LED street light 3-Mobile terminal 4-Server

Figure 2 is a flow chart of a mobile phone 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 light-assisted mobile phone detailed positioning communication system of the present invention includes a background operation center 1 , an LED street light 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 wireless communication module on the background side; the webpage content corresponding to the position of each LED street light 2 written by the operator, including the detailed positioning webpage information, the webpage URL address generated by registration, and its webpage code are stored in the The webpage content storage module; the detailed positioning webpage information includes 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, the nearby characteristic tourism information and advertisement information, etc.; the detailed positioning webpage corresponding to each LED street light 2, the registration generated The web page URL address and its web page code are uploaded to the server 4 . The webpage URL address stored in the webpage content storage module is sent to the corresponding LED street light 2 through the wireless communication module on the background side.

The information sent to the LED street light 2 through the wireless communication module on the background side is not limited to the URL address of the web page, but can also include simple text information (for example, the street location where the LED street light 2 is located, house number, text description and other information).

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

The high-speed flashing of the LED light transmits the carried web page URL address to the mobile phone terminal 3 through an optical channel. The OCC technology is used to transmit information by controlling the high-speed flashing of the LED light, and the light and dark state of the high-speed flashing can be captured by the mobile phone camera. The mobile phone parses the URL address of the webpage transmitted by the LED light through the browser App. Compared with the high prices 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, the mobile phone camera function is called, and the webpage URL address from the LED street light is received, and returned to the browser App to display the detailed positioning page. The URL address of the webpage, the webpage content of the detailed positioning webpage is received from the server through the 4G or 5G interface, the specific house number information of the building near the street where the LED street light 2 is located, the cultural information of the block, the nearby characteristic tourism information and advertising information, etc.

Smartphones have gained widespread popularity, and all users need to spend is a short time to download an app to process software. Therefore, the present invention is easy to be popularized and applied on the user side due to its low cost, convenience and quickness, and the like.

The mobile terminal 3 uses the URL address of the webpage in combination with the 4G or 5G interface to receive from the server the complex webpage content information for locating the webpage in detail. The content of the web page is not limited to the detailed positioning information, but can also be the cultural information of the block, the nearby characteristic tourism information and the advertisement information. While realizing the detailed positioning, more characteristic information near the block is released. At present, the publicity methods of nearby characteristic information are limited to handing out flyers and posting quality advertisements, which not only affects the appearance of the city, but also wastes wood resources. The present invention utilizes the existing LED street light 2 and the mobile phone terminal 3 to give full play to the advantages of the OCC technology, sends some additional information of the location to the mobile phone user, and virtualizes the publicity method, which can not only promote the economic development of nearby characteristic industries, but also can Beautify the city without causing some waste in physical propaganda.

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, the video is divided into frame images; then each frame image is converted into a grayscale image, and the brightness value level of each pixel is 0 to 255; there are in the video 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, re-acquire the video, if successful, continue processing; the average gray value of the light source area of each frame of the image and the set threshold value In contrast, the light and dark state of the light source is determined as the 01 serial code; the 01 serial code is decoded according to the light and dark states of the LED lights following the pilot; finally, the web page URL address is decoded according to the 01 serial 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. A symbol signal is transmitted by a frame picture, then the two symbol signals will be presented in two pictures, one light source is bright, and one light source is dark. Further, if the difference between the two pictures is made, the difference between the two pictures will be found, that is, the position of the light source, so as to realize the positioning.

The problem of light source stroboscopic: If the frequency of light and dark flickering of the light source is very slow, stroboscopic 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, we make the light source at the transmitting end flicker at a 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 is sampled at equal intervals in the global exposure method, and different sampling results of 0 and 1 can be obtained. It can not only solve the strobe problem, but also transmit data correctly.

There are two main research directions in visible light imaging communication. 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 rate is faster. At present, the height of the street lamp is generally between 4 meters and 10 meters, so the present invention can be implemented by means of global exposure.

At present, LED street lights, building door lights and lighting on buildings are all over the city. It is completely possible to use the existing LED lights to realize the detailed positioning of the mobile phone by the 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 light-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 speed. Further, the GPS positioning of the radio frequency communication mobile phone can obtain the street information near the destination in a wide range, but the OCC technology can only communicate within the illumination range, and only under the LED light, can the specific information of the house near the LED light be obtained. The house number information can be compared with the scenery around the LED lights to achieve more specific positioning. Through the combination of LED lights and OCC technology, greater benefits can be exerted, but such an OCC communication system has not been reported yet. The present invention is suitable for the coverage of major streets, and the cost is low. The detailed implementation process of the present invention is described above with reference to the accompanying drawings, but the present invention is not only used to assist the detailed positioning of the mobile phone. It can also display block culture, nearby characteristic tourism information and advertising information according to the URL address of the webpage. As long as it conforms to the idea of using LED street lights to send information to mobile phones, as long as it does not deviate from the principle of the visible light imaging street light communication system, it belongs to the protection scope of the present invention. .

Claims (6)

1. a kind of street lamp based on OCC assists the detailed location of communication system of mobile phone, it is characterised in that including consistency operation center (1), multiple LED street lamps (2), mobile phone terminal (3) and server (4) with camera function；The consistency operation center (1) It will detailed locating web-pages information corresponding with each LED street lamp (2) position, the address webpage URL of registration generation and its web page code It uploads onto the server in (4), and the address each webpage URL is sent corresponding LED street lamp (2) by mode by wireless communication；Institute Stating LED street lamp (2) includes street lamp side wireless communication module, storage unit, control unit, LED drive module and LED light；Afterwards The address webpage URL that platform operation center (1) sends is stored into storage unit；Control unit is according to the webpage in storage unit The address URL carries out coding and generates modulated signal, and controls LED drive module and drive LED light high speed scintillation according to modulated signal；Hand The browser App calling mobile phone camera of machine terminal (3) obtains one section of video and solves the address webpage URL, passes through 4G or 5G interface The detailed locating web-pages information of the address webpage URL is received from server (4).

2. the street lamp according to claim 1 based on OCC assists the detailed location of communication system of mobile phone, it is characterised in that described Consistency operation center (1) can also will simple text information corresponding with LED street lamp (2) position mode is sent out by wireless communication It is sent to corresponding LED street lamp (2).

3. the street lamp according to claim 2 based on OCC assists the detailed location of communication system of mobile phone, it is characterised in that described One section of video according to acquisition of mobile phone terminal (3) solve the corresponding simple text information in LED street lamp (2) position.

4. the street lamp according to claim 1 based on OCC assists the detailed location of communication system of mobile phone, it is characterised in that described Detailed locating web-pages information include near streets building specific number information.

5. the street lamp according to claim 4 based on OCC assists the detailed location of communication system of mobile phone, it is characterised in that described Detailed locating web-pages information also include the block cultural information of each LED street lamp (2) position, neighbouring distinctive tourism information with And advertising information.

6. the street lamp according to claim 1 based on OCC assists the detailed location of communication system of mobile phone, it is characterised in that described Mobile phone terminal (3) is as follows according to the method that the LED street lamp video information of shooting obtains the address webpage URL:

Firstly, browser App calling mobile phone camera obtains one section of video；Then, video is divided into a frame frame image and by each frame Image switchs to grayscale image；By the average gray value in every frame image light source region compared with given threshold, by the light and shade state of light source It is determined as 01 sequence code；Using in video, there are one section of pilot tones to determine the position of LED light in the picture；Judging LED light positioning is No success, it is unsuccessful, reacquire video, it is successful then continue to handle；According to the subsequent LED light light and shade state solution of pilot tone 01 sequence code out；The address webpage URL is solved according to 01 sequence code.