During the epidemic, is the trajectory located by mobile phone card or mobile phone?

It is the location of the mobile phone card.

Global Positioning System (GPS) is a high-precision positioning system based on radio navigation of artificial earth satellites, which can provide accurate geographical position, vehicle speed and accurate time information anywhere in the world and near-earth space. Since the advent of GPS, it has attracted many users with its high precision, all-weather, global coverage, convenience and flexibility. GPS is not only the patron saint of automobiles, but also the intellectual star of logistics industry management.

With the rapid development of logistics industry, GPS plays an important role and becomes the second largest consumer group after the automobile market. GPS is a new generation of satellite navigation and positioning system, which was developed by the United States in 1970s. It took 20 years and cost 20 billion dollars. 1994 is fully built, and it has all-round real-time three-dimensional navigation and positioning functions by land, sea and air.

GPS is a new generation of satellite navigation and positioning system, which was developed by the United States in 1970s. It took 20 years and cost 20 billion dollars. 1994 is fully built, and it has all-round real-time three-dimensional navigation and positioning functions by land, sea and air. After nearly 10 years of application in China's surveying and mapping departments, GPS has the characteristics of all-weather, high precision, automation and high efficiency.

It has won the trust of surveying and mapping workers, and has been successfully applied to geodesy, engineering survey, aerial photogrammetry, vehicle navigation and control, crustal movement monitoring, engineering deformation monitoring, resource exploration, geodynamics and other disciplines, bringing a profound technological revolution to the field of surveying and mapping.