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A Tutorial on Graph-Based SLAM
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DOI：10.1109/MITS.2010.939925.png)
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摘要
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Being able to build a map of the environment and to simultaneously localize within this map is an essential skill for mobile robots navigating in unknown environments in absence of external referencing systems such as GPS. This so-called simultaneous localization and mapping (SLAM) problem has been one of the most popular research topics in mobile robotics for the last two decades and efficient approaches for solving this task have been proposed. One intuitive way of formulating SLAM is to use a graph whose nodes correspond to the poses of the robot at different points in time and whose edges represent constraints between the poses. The latter are obtained from observations of the environment or from movement actions carried out by the robot. Once such a graph is constructed, the map can be computed by finding the spatial configuration of the nodes that is mostly consistent with the measurements modeled by the edges. In this paper, we provide an introductory description to the graph-based SLAM ;problem. Furthermore, we discuss a state-of-the- art solution that is based on least-squares error minimization and exploits the structure of the SLAM problems during optimization. The goal of this tutorial is to enable the reader to implement the proposed methods from scratch.
Keyword:
SIMULTANEOUS LOCALIZATION
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Square root SAM: Simultaneous localization and mapping via square root information smoothing平方根SAM: 通过平方根信息平滑同时定位和映射
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