Article(id=1204385786192965790, tenantId=1146029695717560320, journalId=1189621681917173762, issueId=1204385783789625956, articleNumber=null, orderNo=null, doi=10.19620/j.cnki.1000-3703.20230268, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=research-article, receivedDate=null, receivedDateStr=null, revisedDate=1680537600000, revisedDateStr=2023-04-04, acceptedDate=null, acceptedDateStr=null, onlineDate=1765077547834, onlineDateStr=2025-12-07, pubDate=1687536000000, pubDateStr=2023-06-24, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1765077547834, onlineIssueDateStr=2025-12-07, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1765077547834, creator=13701087609, updateTime=1765077547834, updator=13701087609, issue=Issue{id=1204385783789625956, tenantId=1146029695717560320, journalId=1189621681917173762, year='2023', volume='', issue='6', pageStart='1', pageEnd='62', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1765077547261, creator=13701087609, updateTime=1765079172196, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1204392599332299329, tenantId=1146029695717560320, journalId=1189621681917173762, issueId=1204385783789625956, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1204392599332299330, tenantId=1146029695717560320, journalId=1189621681917173762, issueId=1204385783789625956, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=37, endPage=41, ext={EN=ArticleExt(id=1204385786507538592, articleId=1204385786192965790, tenantId=1146029695717560320, journalId=1189621681917173762, language=EN, title=A Method of Path Search for Automatic Parking System Based on Improved Hybrid A* Algorithm, columnId=1204385784703984231, journalTitle=Automobile Technology, columnName=Special Topic on the 25th International Conference on Automobile Safety Technology, runingTitle=null, highlight=null, articleAbstract=
For the situation that the hybrid A* algorithm is difficult to accelerate the search using collision-free Reeds-Shepp (RS) curves due to the complex environment near the destination in short distance parking scenarios, this paper proposed an improved hybrid A* algorithm that reversely searched the path from the target posture, combined with the cost map look up calculated by A* algorithm to obtain heuristic values. Collision detection was performed by judging whether the car body contour line intersecting with the simplified obstacle to save search time, and by setting suitable vehicle steering angle resolution to increase number of the node expansion direction to ensure the smoothness of the path. Finally, MATLAB was used to simulate and compare the improved algorithm with the original algorithm. The results showed the improved hybrid A * algorithm effectively shortened the path search time both in parallel and vertical parking scenario, resulting in shorter and smoother paths.
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针对混合A*算法在短距离泊车场景下由于终点附近环境复杂,难以用无碰撞的RS曲线加速搜索的情况,提出一种改进混合A*算法,从目标位姿开始反向搜索路径,结合通过A*算法计算得到的代价地图查表获得启发值,通过判断车身轮廓线与简化后的障碍物线是否相交进行碰撞检测以节省搜索时间,并通过设置合适的车辆转向角度分辨率增加节点扩展方向的数量,保证路径的平滑性。最后使用MATLAB对改进算法与原始算法进行仿真对比分析,结果表明,在平行和垂直车位泊车场景下,该改进混合A*算法均可有效缩短路径搜索时间,获得的路径更短、更平滑。
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| 算法 | 搜索时间/s | 节点数量/个 | 路径长度/m |
| 普通混合A*算法 | 0.583 | 163 | 16.3 |
| 改进混合A*算法 | 0.286 | 154 | 15.4 |
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水平车位泊车场景仿真结果数据
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| 算法 | 搜索时间/s | 节点数量/个 | 路径长度/m |
| 普通混合A*算法 | 0.583 | 163 | 16.3 |
| 改进混合A*算法 | 0.286 | 154 | 15.4 |
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| 算法 | 搜索时间/s | 节点数/个 | 路径长度/m |
| 普通混合A*算法 | 0.259 | 174 | 17.4 |
| 改进混合A*算法 | 0.068 | 100 | 10.0 |
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垂直车位泊车场景仿真结果数据
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| 算法 | 搜索时间/s | 节点数/个 | 路径长度/m |
| 普通混合A*算法 | 0.259 | 174 | 17.4 |
| 改进混合A*算法 | 0.068 | 100 | 10.0 |
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