基于中尺度气象模式（MM5）计算GNSS对流层水汽延时

摘要

This paper established Bohai Bay area refractive index of the wet field.Based on three-dimensional data produced by MM5 meteorological model,the GNSS satellite signal propagation delay on the water vapor was calculated by Chebyshev polynomials.Compare with the result produced by Bernese GNSS software,The maximum total zenith delay difference is less than 2 cm,Deviation of the wet delay is 7 mm or so,The maximum difference is 10 mm.the result of MM5 model are credible and have the ideal precision.%基于中尺度气象模式MM5得到的三维气象场数据,建立了渤海湾地区的湿折射率场。采用切比雪夫多项式和微积分等数学方法计算了GNSS卫星信号传播方向上的水汽延时。通过与Bernese软件处理的GNSS结果比较分析来看,二者天顶总延时相差最大不超过2cm,在1cm附近波动。得到的湿延偏差在7mm左右,最大相差10mm.MM5模式积分计算的水汽延时结果可信,具有较理想的精度。