How to use PHP and Websocket to implement a real-time indoor positioning system

With the development of modern society, all areas of our lives are becoming increasingly intelligent, and intelligent building management has been widely used in many places. Indoor positioning technology plays an extremely important role in realizing intelligent management. . In this article, we will introduce how to implement a real-time indoor positioning system using PHP and Websocket.

1. What is an indoor positioning system

The indoor positioning system refers to a kind of intelligence that uses certain technical means to accurately locate the location of people and objects in a building. system, its core technology is the use of signal transmission technology for positioning.

2. System design

(1) Hardware design

The hardware equipment used in this system mainly includes:

• Wireless Tag: sends signals within the coverage of the WiFi network;
• Wireless receiver: receives the wireless signal from the tag and uploads it to the server;
• Server: used to receive and process the uploaded signal.

(2) Software design

The software design used in this system mainly includes:

• Back-end Web server: developed using PHP for Receive wireless signals and upload the signals to the front-end Websocket server;
• Front-end Websocket server: developed using Node.js to pass the received signal to the front-end real-time drawing tool (such as Canvas).

3. Technical Principle

The core technology used in this system is Websocket technology, which can realize two-way communication between the browser and the server through HTTP and TCP communication protocols communication. Specifically, when the user moves indoors and the tag sends a signal through the WiFi network, the wireless receiver will receive the wireless signal and upload this information and the tag's location data to the back-end web server. The back-end Web server transparently transmits the received data to the front-end Websocket server, and the front-end Websocket server then transmits the location data to the front-end real-time drawing tool for real-time positioning.

4. Implementation steps

(1)Build a back-end Web server

We can use PHP and MySQL database to build a back-end Web server, of which PHP uses To receive and process the uploaded signal data, the MySQL database stores user location information data.

(2) Integrating Websocket technology

Using Node.js, we can implement the front-end Websocket server through the WebSocket API. On this basis, real-time positioning can be achieved by using front-end Canvas technology to continuously update the data showing the location.

(3) Tag and receiver settings

Place wireless tags and wireless receivers in buildings that require precise positioning to achieve wireless signal acquisition and tag location determination. The data is transmitted through the network and server, and finally passed to the front end for real-time positioning.

5. Summary

This article introduces how to use PHP and Websocket technology to implement a real-time indoor positioning system. Through this system, users can know their location in real time and can easily reach exactly where they want to go. At the same time, it also brings solutions for the intelligent management of buildings and provides an important reference for future large-scale smart city management.

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