摘要
本文针对传统的体散射模型并未考虑大气不均匀性对信号传输的影响等问题,通过引入垂直非均匀的大气参数改进了模型,并利用其建立了体目标的双基地激光测风雷达方程,仿真了侧向散射回波信号,并与单基地雷达进行了对比分析。研究表明:水平方向上,双基地激光测风雷达的回波信号分布特征与单基地雷达差异较大,其回波信号等值线在近地面为卵形线,随着探测高度的增加,回波信号等值线逐渐变为以主、被动雷达为焦点的椭圆形,并最终趋近于圆形;垂直方向上,双基地激光测风雷达的回波信号随高度衰减剧烈,近地面的回波能量约为10^(-10) J,4 km高度的回波能量约为10^(-15) J,在中低层大气(0~10 km),回波信号中气溶胶散射占比大,在高层大气(10 km以上),分子散射占比大。
The influence of atmospheric uniform is not taken into account in the traditional non-line of sight single scatter model.By adding the uniform atmospheric parameters,the scatter model was improved,the equation of bistatic doppler wind lidar was established,and the echo signal of bistatic wind lidar was simulated,which is compared with the monostatic wind lidar.Results show that,the distribution of echo energy is different from that of monostatic lidar in the horizontal direction.The contours of signal intensity are oval lines close to the ground,with the increasing of detection height,the contours gradually become the ellipse lines,and eventually tend to be rounded.In the vertical direction,the intensity of echo signal of bistatic lidar decreases sharply with the altitude.The echo energy is about 10^(-10) J near the ground,and about 10^(-15) J at 4 km.In the middle and lower atmosphere(0-10 km),aerosol scattering occupies a large part of the echo signal,while in the upper atmosphere(above 10 km),molecular scattering occupies a large part of the echo signal.
作者
李绍辉
孙学金
邵连军
易欣
张传亮
LI Shaohui;SUN Xuejin;SHAO Lianjun;YI Xin;ZHANG Chuanliang(Unit 61741 of People’s Liberation Army,Beijing 100089,China;College of Meteorology and Oceanography,PLA University of Science and Technology,Changsha 410005,China)
出处
《气象科学》
北大核心
2023年第4期523-533,共11页
Journal of the Meteorological Sciences
基金
国家自然科学基金资助项目(41575020)。
关键词
体散射模型
大气参数
散射/消光系数
双基地雷达方程
回波信号
volume scattering model
atmospheric parameters
scattering/extinction coefficients
equation of bistatic lidar
echo signal
