Comparative Analysis of Terahertz Propagation Under Dust Storm Conditions on Mars and Earth
Comparative Analysis of Terahertz Propagation Under Dust Storm Conditions on Mars and Earth
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DOI：
10.1109/jstsp.2023.3285450
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发表时间：
2022-12
影响因子：
7.5
通讯作者：
L. T. Wedage;Bernard Butler;S. Balasubramaniam;Y. Koucheryavy;M. Vuran
中科院分区：
文献类型：
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作者：
L. T. Wedage;Bernard Butler;S. Balasubramaniam;Y. Koucheryavy;M. Vuran
随着无线数据流量的指数增长，可靠的太赫兹（THz）链路对于户外点对点通信是必要的。本文提出了一种改进的Monte Carlo模拟方法，用于估算THz光束传输路径上带电尘埃粒子多次散射引起的THz链路衰减，并基于Mie和Rayleigh近似建立了地球（0.24 THz）和火星（0.24 & 1.64 THz）上相应频率的尘埃粒子散射模型。模拟结果进行了比较，考虑参数，如数量的蒙特-卡罗光子（MCP）包，能见度，尘埃粒子放置密度沿着光束，频率和发射机和接收机之间的距离。此外，信道容量模型，提出了考虑太赫兹链路衰减由于沙尘暴，传播损耗，分子吸收损耗为地球和火星的室外环境。对地球的仿真结果表明，链路衰减随尘埃粒子放置密度、距离和频率的增加而增加，随能见度和MCP数据包的增加而减小。在火星上，两种频率都得到了类似的结果，只是衰减随频率的增加而在一个恒定值附近变化。此外，在0.24太赫兹频率的衰减略高于1.64太赫兹时，更多的尘埃粒子存在于光束的传播路径上。信道容量估计地球和火星环境考虑时间和距离依赖的情况。显示出尘埃颗粒沿着光束突然下降的时间窗口提供了以高可靠性进行通信的机会。此外，增加发射器和接收器之间的距离严重降低了在两种环境中的强沙尘暴条件下的信道容量测量。我们的研究发现，弱沙尘暴对火星的影响相对较小，但对地球的影响要大得多。
Reliable Terahertz (THz) links are necessary for outdoor point-to-point communication with the exponential growth of wireless data traffic. This study presents a modified Monte Carlo simulation procedure for estimating THz link attenuation due to multiple scattering by charged dust particles on the THz beam propagation path. Scattering models are developed for beams through dust, based on Mie and Rayleigh approximations for corresponding frequencies on Earth (0.24 THz) and Mars (0.24 & 1.64 THz). The simulation results are compared, considering parameters such as the number of Monte-Carlo photon (MCP) packets, visibility, dust particle placement density along the beam, frequency, and distance between the transmitter and the receiver. Moreover, a channel capacity model was proposed, considering THz link attenuation due to dust storms, spreading loss, and molecular absorption loss for Earth and Mars outdoor environments. Simulation results for Earth show that the link attenuation increases with dust particle placement density, distance, and frequency, and attenuation decreases with visibility and MCP packets. On Mars, similar results are obtained for both frequencies, except that the attenuation varies around a constant value with the frequency increase. Moreover, attenuation is slightly higher at 0.24 THz frequency compared to 1.64 THz when more dust particles are present on the beam propagation path. Channel capacity is estimated for Earth and Mars environments considering time and distance-dependent scenarios. Time windows that show a sudden drop of dust particles along the beam provide opportunities to communicate with high reliability. Moreover, increasing the distance between the transmitter and receiver severely reduces the channel capacity measurement in strong dust storm conditions in both environments. Our study has found that weak dust storms have relatively little effect on Mars but much more significant effects on Earth.