多波长偏振激光雷达的大气温度探测

atmospheric temperature detection based on multi-wavelength polarization lidar

探测和监控大气温度的分布不仅能够准确地预测天气变化情况、大气环境状况,而且对于应对极端灾害性天气和遏制全球气候变暖也具有一定积极意义。传统微波雷达探测系统工作距离有限,易受到卷云和气溶胶颗粒的干扰,探测到的温度数据与实际结果吻合度低、误差高、可靠性不足。采用一种多波长偏振激光雷达对大气的温度变化情况进行监控,雷达系统接收大气中O_2和N_2向后散射的回波信号,依据数值模拟选择最优的探测波长并调整带宽范围;基于T矩阵算法获取不同相态下大气粒子的激光频谱特征,进而识别出激光雷达的反射率因子、比差分相移、发射率等偏振参量的变化情况,最终实现对大气温度的精准测量。实验分析表明,多波长偏振激光雷达得到的数据准确、可靠,能够用于对大气温度的探测和研究。

Distribution of the detection and monitoring of atmospheric temperature can not only accurately predict the weather changing,atmosphere environment conditions,but also has positive significance for responding disaster weather and curbing global warming. The traditional microwave radar detection system has a limited operating range,which is vulnerable to the interference of cirrus clouds and aerosol particles. And the detection results has lower accuracy,higher error rate and more insufficient reliability than actual results. Using multi-wavelength polarization lidar for atmospheric temperature monitoring,the radar system receives the scattering echo signal of O_2 and N_2,and on the basis of numerical simulation to select the optimum detection wavelength and adjust the bandwidth range. Obtain the laser spectrum characteristics of atmosphere particles in different phases based on T matrix algorithm and then identify the factor of reflective rate,differential phase shift,emission rate and more other polarization parameters of lidar. Finally realize the accurate measurement of the atmospheric temperature. The experimental results show that the data obtained by the multi-wavelength polarization lidar are accurate and reliable,and it can be used to detect and study the atmospheric temperature.