WAAS电离层网格改正算法在中国地区部分站点的试算精度

利用我国及周边地区18个GPS台站、2000年1月、2月的观测数据，考察了FAA WAAS电离层折射误差网格修正算法在中国地区部分站点的精度。结果表明，该算法对于中高纬度的用户站精度较高，误差较小；在地磁纬度较低的地区精度明显下降，误差较为显著。在电离层暴期间，部分用户站的修正精度大量降低，此外，白天、傍晚时段电离层网格改正算法的修正精度较低，而凌晨、夜间的精度相对较高。

The test of FAA WAAS ionospheric grid corrections algorithm

In this paper, FAA WAAS ionosphric grid corrections algorithm is tested by using the-data of 18 GPS observation stations over the time span of two months. Its accuracy is discussed. The results show that the algorithm prediction error is smaller in mid-high magnetic latitude than the one in low magnetic latitude , smaller in low solar activity period than in high solar activity period, and smaller in the morning and at night than in the day time.