The communication big data travel card analyzes the signaling data of the mobile phone, obtains the location of the base station where the user's mobile phone is located, and accurately locates the travel track. Through this service, mobile phone users can query all the city information they have been to in the previous 14 days.
Health codes are based on actual data and can be generated by citizens or people who have returned to work through online declaration and background audit. As an individual entering and leaving electronic certificate locally, the QR code can be declared once, which is universal in the whole city. The introduction of the health code aims to make the work of returning to work more accurate, scientific and orderly.
The standard covers the functions closer to real life applications such as relatives binding, and solves the problems of reporting and traveling epidemic prevention information for the elderly and children.
Travel tracking of health code pays more attention to the reliability and stability of data. In addition, for the sake of data integrity, the data source of health code comes from our mobile phones to a great extent.
When we use the mobile phone, the mobile phone will constantly send out radio signals, which will be captured by the operator base station and Internet companies, and operators and Internet companies will track our journey by filtering these signals.
Under normal circumstances, the mobile phone will communicate with the nearest base station every few seconds, and the operator will know the location after communication. Naturally, I know which cities I went to.
Wechat's health code is mainly to judge whether there is a cross-city WeChat sends the user number to the operator, and the operator tells the WeChat user whether he has left the current city, thus completing the whole judgment process.