GPS can provide navigation and positioning services for road, railway, air and sea transportation vehicles. It can be used for both military and civilian purposes, with both strategic role and commercial interests.

　　GPS includes multiple satellites orbiting the earth, which can continuously transmit radio signals of a certain frequency. As long as you have a portable signal receiver, you can receive specific signals from satellites whether you are on land, at sea or in the air. The computer in the receiver can determine the position of the receiver holder by analyzing the signals from several satellites.

　　GPS has many other uses, for example, scientists can use it to monitor small movements of the earth's crust to help predict earthquakes; Surveyors use it to determine the ground boundary; Car drivers can find directions through it when they get lost; The army relies on it to ensure the correct line of advance.

　　At present, the GPS global positioning system owned by the United States is far ahead in technology. GPS in the United States includes 24 satellites orbiting the earth, which are evenly distributed in six orbits. Each satellite is about 17000 kilometers from the ground.

　　At present, the global positioning system of the United States has created annual sales for its distribution companies of up to 8 billion euros. The Federal Aviation Administration of the United States predicted that, with the increasingly extensive application of satellite positioning and navigation, the sales scale of this industry would double again in the next two to three years.

　　"Galileo" satellite positioning system will enhance the strength of the EU in this field and bring huge economic benefits. A European Union study estimated that the development of Galileo satellite positioning and navigation technology could create about 140000 jobs in Europe alone, and the annual economic benefits would be as high as 9 billion euros. The sale of aviation and navigation terminal equipment alone will generate a revenue of 15 billion euros from 2008 to 2020. It is estimated that by 2020, the economic benefits of the Galileo plan will reach 74 billion euros.

　　The Galileo plan will also bring great social benefits to Europe. As the core part of the future traffic management and measurement system, Galileo satellite positioning system will be the key to reduce relevant costs and generate macroeconomic benefits. In the application of road navigation system, every 1% reduction in travel time, traffic congestion, air pollution and traffic accidents will save 200 billion euros; In civil aviation, the corresponding figure is about 500 million euros.

　　GPS has been used in civilian life for some time. In today's China, we civilians can also enjoy the contributions made by the United States government to the people of the world with peace of mind. Except that WAAS system is not available, others are satisfactory. WAAS is a GPS signal differential correction system based on ground stations covering only North America, which enables the accuracy of GPS signals to reach 0.5-3 meters. However, in China, I have received 10 stars in a relatively wide area, and the measurement accuracy has reached 4-5 meters, which is also quite satisfactory.

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