【摘要】 为研究对流层延迟时空差异性引起的单点定位偏差的不确定性,首先利用IGS ZPD产品分析其最大值、最小值、均值和STD与测站空间分布的相关性,结果显示,ZPD均值约为2.4 m,其存在随纬度增加而减小的总体趋势,但沿赤道不完全对称,在北半球离散度较大;然后针对单点定位模型,推导对流层延迟对定位参数解算的影响公式,并评估其对单点定位的影响,结果表明,对流层延迟对U方向的影响最大(可达7～15 m),对N方向的影响居中(在±0.6 m以内),对E方向的影响最小(在±0.2 m以内)。更多还原

【Abstract】 In order to study the uncertainty of single point positioning deviation caused by the spatiotemporal difference of tropospheric delays, firstly, we use the IGS ZPD product to analyze the correlation between the maximum, minimum, mean, STD and spatial distribution of the station. The results show that the ZPD average is around 2.4 m. There is an overall tendency to decrease with increasing latitude. However, it is not completely symmetrical along with the equator, and the dispersion is slightly larger in the northern hemisphere. Then, based on single point positioning model, the influence formula of tropospheric delay on the calculation of positioning parameters is derived, and its influence on single point positioning is evaluated. The results show that the positioning deviations caused by tropospheric delay are the largest in the U direction, reaching 7 to 15 m; the most insignificant deviations are shown in the E direction, within ±0.2 m; and the deviations in the N direction are centered within ±0.6 m.更多还原