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.
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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.