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差分全球定位系统.
差分全球定位系统
差分全球定位系统(Differential Global Positioning System,简称 DGPS 或差分GPS),是一种应用于全球定位系统中用以提高民用定位精度的一种技术。美国軍方基於國防安全的考量,避免敵對方使用衛星定位信號於武器用途,在广大用户所使用的标准定位服务(SPS)中人为地引入误差,即在所有的GPS工作卫星上实施选择可用性(SA)政策,使水平定位精度降低至100m(2dRMS),垂直定位精度为156m(2a),时间精度为175ns。尽管 SA 政策已于2000年5月1日停止使用,但是单点定位的精度也只有20-40m,这样的精度难以满足飞机导航、工程测量等方面的定位需求。差分全球定位系统技术解决了这种问题,提高了单点定位的精度。
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