BARBARA WAAS used to be a book-keeper for a small brokerage firm.

BARBARA WAAS过去曾是一家小型经纪公司的薄记员。

The flowchart and characteristic of the grid-based algorithm fur Ionospheric delay correction in WAAS are discussed.

阐述了广域增强系统电离层延迟网格修正算法流程、思路及特点，希望能给相关研究者提供参考。

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.

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。