导航卫星信号湿延迟参数化模型和数值模式的比较

Abstract

对高精度导航卫星处理软件(GAMIT)确定的卫星信号湿延迟和香港天文台中尺度数值模式(ORSM)所计算的湿延迟进行了比较,发现二者相关系数为0.99,偏差为3mm,平均绝对偏差为26.7mm,基本不存在系统性的偏差。卫星在天顶时,两者偏差最小,随着卫星仰角的降低,偏差增大,在天顶角70-80°时,两者确定信号湿延迟平均绝对偏差可达30mm。 We examined the accuracy of wet slant delay extracted by double differenced method against ORSM –an operating numeric weather model in the Hong Kong observatory on the near real time basis.The accuracy of the DD method is primarily dominated by that of the estimate of wet zenith delay and multiplied by the wet mapping function.It determines the wet slant delay with 3 mm bias and 27 mm root mean square error against the ORSM model.At low elevation angle,the mean absolute difference can reach 30mm.