Design of a 3D ray-tracing model based on digital elevation model for comprehension of large- and small-scale propagation phenomena over the Martian surface

IF 0.9 4区 计算机科学 Q3 ENGINEERING, AEROSPACE
Stefano Bonafini, Claudio Sacchi
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引用次数: 1

Abstract

The aim of the scientific community, towards the investigation of solutions able to favor a futuristic human settlement on Mars, also concerns ad hoc communication systems and wireless networks to be deployed over the “Red planet.” However, the state-of-the-art appears to be missing of realistic and replicable models for understanding the radio propagation over precise Martian locations. This means that performing solid simulations, rather than roughly approximated ones, is really a tough task. Thus, this paper describes the design of a 3D ray-tracing simulator based on high-resolution digital elevation models (DEMs) for the evaluation of Martian large-scale and small-scale phenomena in the S and EHF bands. First, by taking advantage of the Cole–Cole equations, we computed the complex permittivity of the JSC Mars-1 Martian regolith simulant. Then, we developed a 3D tile-based structure of the Gale crater, thanks to its DEM, and finally, we implemented a ray-tracing algorithm for outdoor environments able to trace the line of sight (LOS), the first and second reflections of a radio frequency (RF) signal between a transmitter (TX) and a receiver (RX) over the 3D structure. The results focus on estimating path losses, shadowing values, outage probability, and on the parametrization of multipath channels for selected areas and subareas, presenting heavily different morphological features, of the Gale crater. Moreover, some brief considerations about dust storms and atmosphere harmful effects on propagation will be drawn.

Abstract Image

设计了一种基于数字高程模型的三维光线追踪模型,用于理解火星表面大尺度和小尺度的传播现象
科学界的目标是研究未来人类在火星上定居的解决方案,这也涉及到在“红色星球”上部署的临时通信系统和无线网络。然而,最先进的技术似乎缺乏现实的和可复制的模型来理解精确的火星位置上的无线电传播。这意味着执行可靠的模拟,而不是粗略的近似模拟,确实是一项艰巨的任务。因此,本文设计了一种基于高分辨率数字高程模型(dem)的三维射线追踪模拟器,用于评估火星S和EHF波段的大尺度和小尺度现象。首先,利用Cole-Cole方程,我们计算了JSC Mars-1火星表土模拟物的复介电常数。然后,我们开发了盖尔陨石坑的三维瓦片结构,这要归功于它的DEM,最后,我们实现了一种户外环境的光线追踪算法,能够追踪视线(LOS),发射器(TX)和接收器(RX)之间的射频(RF)信号在3D结构上的第一次和第二次反射。结果集中在估计路径损失、阴影值、中断概率,以及对盖尔陨石坑的选择区域和子区域的多路径通道的参数化,这些区域呈现出截然不同的形态特征。此外,还对沙尘暴和大气对传播的有害影响作了简要的考虑。
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来源期刊
CiteScore
4.10
自引率
5.90%
发文量
31
审稿时长
>12 weeks
期刊介绍: The journal covers all aspects of the theory, practice and operation of satellite systems and networks. Papers must address some aspect of satellite systems or their applications. Topics covered include: -Satellite communication and broadcast systems- Satellite navigation and positioning systems- Satellite networks and networking- Hybrid systems- Equipment-earth stations/terminals, payloads, launchers and components- Description of new systems, operations and trials- Planning and operations- Performance analysis- Interoperability- Propagation and interference- Enabling technologies-coding/modulation/signal processing, etc.- Mobile/Broadcast/Navigation/fixed services- Service provision, marketing, economics and business aspects- Standards and regulation- Network protocols
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