采用具有最佳频率组合的双通道微波辐射计测量大气湿延迟,由于是在测量路径上实时获得测量信息的,测量结果可反映大气时变特性和水平不均匀性,同时可消除云中液态水对湿延迟的“过量”估计。因此,用于电波折射误差修正和解算大气积分水汽(或可降水量PWV)可有很高的精度。由历史气象探空数据分析,得出权函数随高度变化小的频率对在不同气候区或地区不同,工作在最佳频率对时,在5km以下高度权函数相对变化可小于5%。 The atmospheric wet delay is measured using a dual-channel microwave radiometer with the best combination of frequencies. Due to the real-time measurement of the measured information in the measurement path, the measurements reflect the time-varying nature of the atmosphere and the horizontal inhomogeneities, while eliminating liquid cloud water “Excess ” estimation of wet delay. Therefore, there is a high degree of accuracy for correcting and resolving atmospheric refraction errors (or precipitable PWVs). From the analysis of the historical meteorological sounding data, it is concluded that the frequency of the weight function changing with height is different from that of the different climatic regions or regions. When working at the optimal frequency pair, the relative change of the height weight function under 5km may be less than 5%.