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arXiv 2201.03163cs.RO
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复杂停车环境下路径规划的连续曲率目标树算法

Continuous-Curvature Target Tree Algorithm for Path Planning in Complex Parking Environments

Seoul National University(首尔大学);Advanced Institutes of Convergence Technology(融合技术高等研究院)

Minsoo Kim, Joonwoo Ahn, Jaeheung Park

摘要:

快速探索随机树(RRT)由于能够快速求解高维运动规划,且易于反映约束,已被应用于自主泊车。然而,规划时间增加了向狭窄的停车位延伸而不发生碰撞的可能性。为了减少规划时间,提出了目标树算法,用一组向后停车路径(目标树)代替RRT中的停车目标。然而,它由圆形和直线路径组成,由于曲率不连续,自动驾驶车辆无法准确停车。此外,在复杂的环境中,规划时间会增加;向后的路径可能会被障碍物阻挡。因此,本文提出了一种适用于复杂停车环境的连续曲率目标树算法。首先,目标树包括回旋曲线路径以解决这种曲率不连续性。其次,为了进一步减少规划时间,定义了一个成本函数来构建考虑障碍物的目标树。该算法结合最优变量RRT算法,在到达的反向路径中搜索最短路径,随着采样时间的增加,该算法可以获得一条接近最优的路径。真实环境下的实验结果表明,与其他基于采样的算法相比,车辆可以更准确地停车,并且更快、更高地获得连续曲率路径。

英文摘要:

Rapidly-exploring random tree (RRT) has been applied for autonomous parking due to quickly solving high-dimensional motion planning and easily reflecting constraints. However, planning time increases by the low probability of extending toward narrow parking spots without collisions. To reduce the planning time, the target tree algorithm was proposed, substituting a parking goal in RRT with a set (target tree) of backward parking paths. However, it consists of circular and straight paths, and an autonomous vehicle cannot park accurately because of curvature-discontinuity. Moreover, the planning time increases in complex environments; backward paths can be blocked by obstacles. Therefore, this paper introduces the continuous-curvature target tree algorithm for complex parking environments. First, a target tree includes clothoid paths to address such curvature-discontinuity. Second, to reduce the planning time further, a cost function is defined to construct a target tree that considers obstacles. Integrated with optimal-variant RRT and searching for the shortest path among the reached backward paths, the proposed algorithm obtains a near-optimal path as the sampling time increases. Experiment results in real environments show that the vehicle more accurately parks, and continuous-curvature paths are obtained more quickly and with higher success rates than those acquired with other sampling-based algorithms.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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