没有SA政策的GPS单点定位的应用

全球定位系统(Global Position System)的应用最初仅限于军队和国防建设，现在已经广泛地应用于导航、定位、大地测量及科学研究等领域，GPS单机定位已是一种常见的应用方式。但是，GPS单机定位精度受到美国政府SA政策的直接影响。从2000年5月1日开始，美国政府取消了SA政策，所以GPS单点定位的精度将会有所提高。文中详细分析了取消SA政策后的GPS单点定位的精度及民用GPS的应用及前景。

Application of GPS single-point positioning without SA policy

Global Positioning System (GPS) initially is only used for army and national defence construction, but now is widely used for navigation, positioning, geodetic surveying and scientific research etc., and GPS single -point positioning has been a common application. But the precision of GPS single -point positioning is directly surfer from the SA policy of American government. From the beginning of May 1, 2000, the SA policy was cancelled by American government so that the precision of GPS single -point positioning can be greatly improved. The paper analyzed in detail the precision of GPS single -point positioning without SA policy and introduced the application and prospect of GPS user of civil industry.