全类型大气波导探测方法研究

Research on Detection Methods for All Types of the Atmospheric Duct

大气波导是对流层中一种异常大气折射结构,它改变了电磁波的正常传播特性,严重影响了电子设备使用。目前对于大气波导的探测手段还比较单一,无法实现全类型大气波导的探测。针对这一现状,本文基于转动拉曼大气温度探测和振动拉曼大气湿度探测的原理,结合蒸发、表面和悬空波导的诊断方法,构建了全类型大气波导诊断模型。利用拉曼激光雷达新技术,实现了全类型大气波导的监测诊断。通过对比拉曼激光雷达和无线电探空仪测量数据,得到:拉曼激光雷达测量的大气温度廓线平均误差为0.535℃,温度误差小于1℃的概率为82.5%;水汽混合比廓线平均误差为0.121 7 g/kg,水汽混合比误差小于1 g/kg的概率为90%,基于拉曼激光雷达的悬空波导高度、厚度、强度诊断准确率分别为94.8%、85.8%和60%;此外,基于拉曼激光雷达的连续探测数据,可以进一步分析大气波导特征量随时间的变化规律。

Atmospheric duct is an abnormal refraction structure in the troposphere atmosphere,which can change the normal propagation characteristics of the electromagnetic wave and seriously affect the use of the electronic equipment.At present,the detection method of the atmospheric duct is still relatively simple,which cannot achieve the monitoring of all types of the atmospheric duct.In view of this situation,based on the principle of the rotating Raman for the atmospheric temperature detection and the vibration Raman for the atmospheric humidity detection,combined with the diagnostic methods of the evaporation duct,the surface duct and the elevated duct,a diagnostic model of all types of atmospheric duct is constructed in this paper.Based on the new Raman laser radar technology,this paper solved the diagnosis of all types of the atmospheric duct.By comparing the data measured by the Raman Lidar and the radiosonde,the conclusion is as follows:the temperature and the humidity measured by the Raman Lidar are in good agreement with the data of the radiosonde,the average error of the temperature profile is 0.535℃,and the probability of the temperature error less than 1℃ is 82.5%.The average error of the water vapor mixing ratio profile is 0.1217 g/kg,and the probability of the water vapor mixing ratio error less than 1 g/kg is 90%.The diagnostic accuracy of the height and the thickness and the strength of the atmospheric duct based on Raman Lidar is 94.8%,85.8%and 60%respectively.In addition,based on the continuous detection data of the Raman Lidar,the variation of the atmospheric duct characteristics with time can be further analyzed.