摘要
地基GPS反演大气可降水量(precipitable water vapor,PWV)已经达到1~2 mm的精度,但其反演大气湿折射率廓线信息精度却有待提高。以中国香港GPS参考网为基础,分析测站空间分布对水汽反演结果的影响。采用仿真算法设置大气湿折射率廓线信息,进一步计算每条信号湿延迟(slant wet delay,SWD),再利用卡尔曼滤波反演湿折射率廓线。设计了4组不同的GPS测站空间分布方案进行对比实验,结果表明:地基GPS反演大气湿折射率的精度受测站空间的分布影响较大,在垂直方向分布较为合理的高-中-低型布站方案的反演结果的精度最优,而均分布在0.30 km高度以下的原始测站高度方案精度最差。
The accuracy of precipitable water vapor(PWV)inversion by ground-based GPS has reached 1—2 mm,but its tomographic atmospheric wet refractivity profile information accuracy needs to be improved. Based on GPS reference network in Hong Kong,China,we analyze the impact of the spatial distribution of stations on water vapor inversion results.And we set atmospheric wet refractivity profile information with simulation algorithm and calculate slant wet delay(SWD)of each signal. Then Kalman filter method is used to invert wet refractivity profiles. We design four schemes with different GPS stations’ spatial distribution for comparative experiments. The results show that the inversion accuracy of atmosphere wet refractivity by ground-based GPS is greatly affected by the spatial distribution of GPS stations. The high-medium-low distribution station scheme with reasonable vertical distribution has the best accuracy,while the scheme of the original stations below 0. 30 km with average distribution has the worst accuracy.
作者
李磊
李曦凌
李正品
张永林
孙嘉骏
LI Lei;LI Xiling;LI Zhengpin;ZHANG Yonglin;SUN Jiajun(Kunming Engineering Corporation Limited,Power China,Kunming 650051,China)
出处
《测绘地理信息》
CSCD
2022年第3期34-37,共4页
Journal of Geomatics
基金
国家自然科学基金(41721003)。
关键词
湿折射率
层析
GPS
测站空间分布
wet refractivity
tomography
GPS
spatial distribution of station
