通过对基准站上空的格网内的电离层穿透点个数进行统计分析，讨论了我国广域增强系统基准站的布局与数量问题。
It analyses the quantity of ionosphere Pierce point in grid above the reference stations, and simply discusses the question of reference stations position and quantity in China WAAS.
在GPS的广域、局域增强导航系统和rtk的应用中，电离层延迟改正的准确度都是决定测量定位结果能否达到精度要求的重要因素。
The accuracy of ionospheric delay correction is an important factor that affects the positioning precision in the applications of GPS in wide area, local area navigation systems and RTK.
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