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arXiv 1111.1492cs.DCcs.DScs.RO
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具有不可靠罗盘的两个不经意机器人的集结问题

The Gathering Problem for Two Oblivious Robots with Unreliable Compasses

Nagoya Institute of Technology(名古屋工业大学);Japan Advanced Institute of Science and Technology(日本北陆先端科学技术大学院大学);Kyushu University(九州大学)

Taisuke Izumi, Samia Souissi, Yoshiaki Katayama, Nobuhiro Inuzuka, Xavier Défago, Koichi Wada, Masafumi Yamashita

摘要:

在讨论匿名移动机器人的模式形成问题时,通常将其分为同步、半同步和异步机器人。对于半同步机器人,所有可利用记忆形成的图案也可以在没有记忆的情况下形成,唯一的例外是形成点(即,两个机器人的集合。然而,收集两个半同步机器人没有记忆的问题是平凡的解决时,他们的局部坐标系是一致的,和不可能性证明本质上使用的不一致性,在他们的坐标系。受此启发,本文研究了局部坐标系之间的一致性的大小,必要和充分的解决半同步和异步模型下的两个不经意的机器人收集问题。为了讨论一致性的大小,我们假设每个机器人都配备了一个不可靠的指南针,其轴承可能会偏离绝对参考方向,每个机器人的局部坐标系由其指南针确定。我们考虑两类不可靠罗盘,即常方位的静态罗盘和方位可任意变化的动态罗盘。对于机器人和指南针模型的每种组合,我们建立了偏差θ的条件,该条件允许算法解决收集问题,其中偏差由指南针的x轴与全局坐标系的参考方向之间形成的最大角度测量:对于具有静态罗盘的半同步和异步机器人,θ < π/2,对于具有动态罗盘的半同步机器人,θ < π/4,对于具有动态罗盘的异步机器人,θ < π/6。除了具有动态罗盘的异步机器人外,这些充分条件也是必要的。

英文摘要:

Anonymous mobile robots are often classified into synchronous, semi-synchronous and asynchronous robots when discussing the pattern formation problem. For semi-synchronous robots, all patterns formable with memory are also formable without memory, with the single exception of forming a point (i.e., the gathering) by two robots. However, the gathering problem for two semi-synchronous robots without memory is trivially solvable when their local coordinate systems are consistent, and the impossibility proof essentially uses the inconsistencies in their coordinate systems. Motivated by this, this paper investigates the magnitude of consistency between the local coordinate systems necessary and sufficient to solve the gathering problem for two oblivious robots under semi-synchronous and asynchronous models. To discuss the magnitude of consistency, we assume that each robot is equipped with an unreliable compass, the bearings of which may deviate from an absolute reference direction, and that the local coordinate system of each robot is determined by its compass. We consider two families of unreliable compasses, namely,static compasses with constant bearings, and dynamic compasses the bearings of which can change arbitrarily. For each of the combinations of robot and compass models, we establish the condition on deviation ϕthat allows an algorithm to solve the gathering problem, where the deviation is measured by the largest angle formed between the x-axis of a compass and the reference direction of the global coordinate system: ϕ< π/2 for semi-synchronous and asynchronous robots with static compasses, ϕ< π/4 for semi-synchronous robots with dynamic compasses, and ϕ< π/6 for asynchronous robots with dynamic compasses. Except for asynchronous robots with dynamic compasses, these sufficient conditions are also necessary.

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