未知环境中扩散源的自主搜索
Autonomous search for a diffusive source in an unknown environment
摘要:
本文提出了一种方法,嗅觉搜索的扩散排放源的示踪剂(如气溶胶,气体)在环境中与未知地图的随机放置和形状的障碍。示踪剂浓度的测量是零星的,嘈杂的,没有方向信息。搜索域离散化和建模的有限的二维晶格。链接是晶格,表示发射粒子和粒子的可遍历路径。晶格中缺少的链接表示由于墙壁或障碍物而阻塞的路径。搜索器必须同时估计源参数、搜索域的地图以及它自己在地图中的位置。该解决方案在顺序贝叶斯框架中制定,并实现为具有信息驱动运动控制的Rao-Blackwellised粒子滤波器。数值结果验证了这一概念及其性能。
英文摘要:
The paper presents an approach to olfactory search for a diffusive emitting source of tracer (e.g. aerosol, gas) in an environment with unknown map of randomly placed and shaped obstacles. The measurements of tracer concentration are sporadic, noisy and without directional information. The search domain is discretised and modelled by a finite two-dimensional lattice. The links is the lattice represent the traversable paths for emitted particles and for the searcher. A missing link in the lattice indicates a blocked paths, due to the walls or obstacles. The searcher must simultaneously estimate the source parameters, the map of the search domain and its own location within the map. The solution is formulated in the sequential Bayesian framework and implemented as a Rao-Blackwellised particle filter with information-driven motion control. The numerical results demonstrate the concept and its performance.
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