摘要
基于大气折射和辐射原理研究了用微波辐射计测量大气辐射亮度温度修正外弹道测量系统电波折射误差的原理。着重讨论了双频微波辐射计修正对流层折射的方法和最佳频率选择。这种修正方法的优点是:第一不受大气水平分层假设的限制;第二能消除云中液态水对修正效果的影响,从而使双频辐射计成为高精度全天候实时折射修正系统。文中还给出了数值结果。为了比对,分别用 S.C.Wu 的双频法和射线追迹法计算了距离折射误差。初步分析了修正方法的精度。结果表明:1.本文所述方法能完全消除云滴的残余影响,提高修正精度。2.该方法和射线追迹法符合程度好于S.C.Wu 的方法。
Based on the theory of atmospheric refraction and emission,the principle of refractive error correction in outer trajectory wave measuring systems is studied.Stress is laid on the method of dual—frequency radiometer.First,the assumption of atmospheric horizontal stratification is not required.Secondly,the influence of liquid water in clouds can be eliminated.Besides,the dual—frequency radiometer is a high accuracy,all weather,real—time refractive correcting system.Numerical results are shown.For comparison,range refractive errors are calculated separately using Wu's dual —frequency method and ray—tracking method.Better agreement exists between this method and the ray—tracking one.
出处
《电波科学学报》
EI
CSCD
1993年第3期18-23,共6页
Chinese Journal of Radio Science
关键词
对流层
电波折射
双频辐射计
Atmospheric refraction
Atmospheric emission
Atmospheric attenuation
Cloud attenuation
Range error
