The GPS positioning system has the characteristics of good performance, all -weather, high accuracy, wide application, and automatic measurement. It is by far the best navigation positioning system. With the continuous improvement of the global positioning system and the continuous improvement of hard and software, the application field is continuously developing. Nowadays, various departments of the national economy have begun to gradually penetrate people's daily lives.

　　With the end of the Cold War and the vigorous development of the global economy, the US government canceled the SA policy on the premise that the national security is not threatened from 2000 to 2006, and the accuracy of GPS civilian signal accuracy was improved globally. The accuracy of single -point positioning is increased from 100 meters to 20 meters, which will further promote the application of GPS technology, improve productivity, operating efficiency, scientific level, and people's quality of life, and stimulate the growth of the GPS market. According to relevant experts, in the United States, the GPS navigation system alone is alone. After 2000, the market reaches US $ 3 billion, and in my country, the market for automobile navigation has reached 5 billion yuan. It can be seen that the application prospects of the GPS technology market are very considerable.

　　The main purpose of the global positioning system

　　(1) Land application mainly includes vehicle navigation, emergency response, atmospheric physical observation, earth physical resource exploration, engineering measurement, deformation monitoring, crustal motion monitoring, municipal planning control, etc.;

　　(2) Marine applications, including the best voyage route measurement of ocean ships, real -time shipments and navigation of ships, marine rescue, marine treasure, hydrogeological measurement, marine platform positioning, sea level lift monitoring, etc.;

　　(3) Aerospace applications, including aircraft navigation, aviation remote attitude control, low -orbit satellite rails, missile guidance, aviation rescue and manned spacecraft protection detection.

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