微波在带电沙粒中的衰减效应
Attenuation effects of microwave through charged sand particles
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摘要: 根据沙粒的等效介电常数模型和Rayleigh近似下带电球形粒子的前向散射振幅函数，给出了对数分布模型下的带电沙尘粒子引起微波的衰减计算模型，并进行了分析和仿真计算。结果表明:带电沙粒比不带电沙粒对微波信号衰减的影响明显增大，带电沙粒所带表面电荷越集中，对微波的衰减影响越大；微波衰减随能见度的增大而减小;对于相同含水量，频率小于35 GHz时，沙尘对电磁波衰减的影响较小,频率大于35 GHz时，沙尘对电磁波的衰减影响增大。Abstract: According to the log-normal size distribution of the sand particles, the calculation model of microwave attenuation induced by the charged sand is got based on the forward scattering amplitude function under the Rayleigh approximation and the effective permittivity method. The attenuation is simulated and analyzed. The attenuation evidently increases with the charged sand particles to microwave signal, the more charge collection on surface of the charged sand particles, the stronger influence to the attenuation of microwave. And the attenuation evidently decreases with the visibility of sand particles increasing. Generally for sand with the same water content, the change of attenuation is small while the electromagnetic wave frequency below 35 GHz, the influence is obvious while the freque
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Key words:
- microwave /
- dielectric constant /
- water percent /
- attenuation /
- charged sand particle
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