摘要
根据上海和北京两站１９９２～１９９３两年的气象探空资料，分别计算了ＧＰＳ伪距测量中的干项和湿项订正值。在此资料样本上，用最小二乘回归拟合得到了干、湿项订正的算式。分析大气球面分层的计算结果可见，干、湿项订正值随卫星天项角（≤７５°）的变化可以很好地用Ｓｅｃａｎｔ律来表示。该算式的精度优于其他模型；
Two year(1992 and 1993) radiosonde data at Shanghai and Beijing are used to calculate the exact values of the atmospheric path delay in the microwave region.Based on these calculations and the meteorological parameters at the surface,the algorithms for dry and wet correction contributions at the zenith angle of 0 are established by the least squares fit. The analysis of spherically layering calculated results shows that the variation of atmospheric path delay (especially wet term) with zenith angle obeys well the secant law.Comparisons of different correction models indicate that our algorithms give better correction results with smaller rmsdeviations.
出处
《测绘学报》
EI
CSCD
北大核心
1996年第2期127-132,共6页
Acta Geodaetica et Cartographica Sinica
基金
国家教育委员会留学回国人员项目
航天技术有关项目
关键词
GPS
测量
大气
路径
GPS,Path delay,Atmospheric dry air correction,Wet term correction.
