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Improve positioning accuracy Decrease positioning accuracy Reduce operational cost I don't know"
GPS DGPS GLONASS HF radio"
GPS 卫星上 （A）+ C DGPS 卫星导航仪所在的船上 沿海岸边或岛屿海岸边缘处
传统GPS定位方法 相对定位/差分定位DGPS 网络辅助的GPS定位方法AGPS AFLT
much higher than that of GPS much poorer than that of GPS about the same as that of GPS either higher or poorer than that of GPS"
GPS DGPS GLONASS HF radio"
forward error correction aftward error correction DGPS GPS error-free and low error reception"
GPS and DGPS can be used at every corner of the world there are areas neither GPS nor DGPS is available there are areas that DGPS can be used but GPS is not available there are areas that GPS can be used but DGPS is not available
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