GPS測位のSA解除における誤差の変動

概要

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GPS was initially developed for military purposes in America. The signals were then opened for civilian use in a variety of fields, for example automobile navigation, surveying and so on. As for the observation by C/A code, SA (Selective Availability) was created. SA, used by the United States Department of Defense, introduce errors into the Standard Positioning Service GPS signals to degrade the fixed accuracy. This was done to maintain optimum military effectiveness by the U.S. However, this was canceled in May of 2000 therefore improving the precision of point positioning. This study compared the precision before SA cancellation and after cancellation. The average errors after SA cancellation decreased from 25m to 4m.
神戸市立工業高等専門学校の論文