Due to the characteristics of all-weather, high-precision and automatic measurement of GPS technology, as an advanced measurement method and new productivity, it has been integrated into various application fields of national economic construction, national defense construction and social development.

　　With the end of the Cold War and the vigorous development of the global economy, the US government announced that from 2000 to 2006, under the premise that the US national security will not be threatened, the SA policy will be cancelled, and the accuracy of GPS civil signals will be improved on a global scale. The accuracy of single-point positioning with /A code is increased from 100 meters to 20 meters, which will further promote the application of GPS technology, improve productivity, operational efficiency, scientific level and people's quality of life, and stimulate the growth of the GPS market. According to the forecast of relevant experts, in the United States, the market of car GPS navigation system alone will reach 3 billion US dollars after 2000, and in my country, the market of car navigation will also reach 5 billion yuan. It can be seen that the application prospect of GPS technology market is very impressive.

　　GPS Features

　　The main features of GPS are: (1) all-weather; (2) global coverage; (3) high-precision three-dimensional fixed-speed timing; (4) fast, time-saving and high-efficiency; (5) wide application and multi-function.

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