火星翻滚漫游车群在全球沙尘暴条件下的概率轨迹与扩散研究
A Probabilistic Trajectory and Dispersion Study of Martian Tumbleweed Rover Swarms in Global Dust Storm Conditions
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中文总结 AI 辅助
本研究针对火星全球沙尘暴中漫游车群的扩散与通信问题，提出基于MCD风场和随机模型的概率轨迹方法，证明20车群体在合理阵风条件下可保持连通。
中文摘要 AI 辅助
全球沙尘暴（GDS）主导着火星气候，然而由于现场观测受限，沙尘的抬升、输送和沉积机制仍缺乏约束：着陆器是固定的，且其放射性同位素热电发电机（RTGs）会污染局部测量。我们的解决方案是采用一群轻量级、风驱动的球形漫游车——沙尘漫游车（DRs）——它们遵循自然风型，在风暴期间收集高空间分辨率的现场沙尘数据。在此，我们量化了该机器人架构的扩散和通信连通性。利用火星气候数据库（MCD）计算的“好奇号”着陆点MY34风暴的625个风状态，我们构建了近地表风速的双变量正态模型，并刻画了其昼夜结构。漫游车轨迹和群体扩散通过三种积分器进行传播：用于确定性动力学的欧拉和四阶龙格-库塔格式，以及模拟湍流阵风强迫的随机Ornstein-Uhlenbeck公式。扩散受未测量的阵风相关时间控制：在施加静态滚动阈值的情况下，白噪声阵风情形（tau_g = Delta t = 1秒）在一小时内使两辆漫游车的间距保持在1米以下（一个火星日内为0.44公里），而相关时间为10-60秒时，一小时内的间距为6-25米（一个火星日内为1.4-3.3公里）。我们证明，一个由20辆漫游车组成的群体，每辆漫游车仅需1.6-4.1公里的通信范围即可在一个火星日内保持连通，并且在合理包络内——即阵风幅度高达标称值的两倍且tau_g <= 60秒，以及标称幅度下tau_g约达150秒——群体仍能保持连通。
英文摘要
Global Dust Storms (GDSs) dominate the Martian climate, yet the mechanisms of dust lifting, transport, and deposition remain poorly constrained because in situ observations are limited: landers are stationary, and their Radioisotope Thermoelectric Generators (RTGs) contaminate local measurements. Our solution is a swarm of lightweight, wind-propelled spherical rovers -- Dust Rovers (DRs) -- that follow natural wind patterns to collect high-spatial-resolution in situ dust data during storms. Here, we quantify the dispersion and communication connectivity of this robotic architecture. Using 625 wind states calculated using the Mars Climate Database (MCD) for the MY34 storm at the Curiosity site, we build a bivariate-normal model of the near-surface wind velocity and characterise its diurnal structure. Rover trajectories and swarm dispersion are propagated with three integrators: the Euler and fourth-order Runge-Kutta schemes for the deterministic dynamics, and a stochastic Ornstein-Uhlenbeck formulation that simulates turbulent gust forcing. Dispersion is controlled by the unmeasured gust correlation time: with a static rolling threshold enforced, the white-gust case (tau_g = Delta t = 1 s) provides a two-rover separation below 1 m over an hour (0.44 km over a sol), whereas correlation times of 10-60 s yield 6-25 m over an hour (1.4-3.3 km over a sol). We demonstrate that a 20-rover swarm needs only a 1.6-4.1 km per-rover range to remain connected over a sol, and stays connected across the plausible envelope -- for gust amplitudes up to twice the nominal value with tau_g <= 60 s, and at the nominal amplitude up to tau_g ~ 150 s.
发表机构
- University of Oxford（牛津大学）
- University of Toronto（多伦多大学）
机构由 AI 辅助整理，请以论文原文为准。
