摘要
应用沙尘粒子的尺寸分布和沙粒的等效介电常数模型,给出了微波在沙尘暴中的传输模型,表明沙尘的衰减和相移与沙粒的等效半径成正比关系,并对不同能见度、不同频率和不同高度下沙尘暴引起的衰减和相移进行了仿真计算。结果表明,对数正态分布和指数分布对微波的传输特性影响最大,瑞利分布和正态分布的预测结果比较接近且影响最小。
Based on the size distributions of sand particle and the equivalent permittivity method,the model of microwave transmission into sand/dust storms was obtained.The attenuation and phase shift caused by sandstorm of different visibility,frequency and height was calculated with the simulation model.It was shown that attenuation and phase shift is proportional to the value of equate radius of sand;the log-normal and exponential distributions have more effect on microwave,but the Rayleigh and normal distributions have little effect and the results are close.
出处
《装备环境工程》
CAS
2010年第5期1-3,19,共4页
Equipment Environmental Engineering
基金
国家自然科学基金项目(60801047
60971079)
陕西省教育厅(2010JK891)
关键词
尺寸分布
微波
衰减和相移
size distribution
microwave
attenuation and phase shift
