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路径规划—PRM(Probabilistic Road Map)

2021-07-26 20:01:23  阅读:320  来源: 互联网

标签:Map map PRM free collision points phase path Probabilistic


一、原理:

Probabilistic Road Map, 分为两个过程

Learning phase和Query phase.

Learning phase:

1. Sample N points in C-space.(在空间内撒N个点)

2. Delete points that are not collision-free.

3. Connect to nearest points and get collision-free segments.

4. Delete segments that are not collision free.

 

 

 

 


Query phase:

  1. Search on the road map to find a path from the start to the goal(using Dijkstra's algorithm or the A* algorithm).
  2. Road map is now similar with the grid map(or a simplified grid map).

二、优缺点:

优势:

概率完备;不用在整个环境搜索,简化了环境,相对于A*更加高效

劣势:

Required to solve 2 point boundary value problem.

Build graph over state space but no particular focus on generating a path.

Not efficient.


改进方法:Lazy collision-checking

一、基本思想:

Collision-checking process is time-consuming, especially in complex or high-dimensional environments. So sample points and generates segments without considering the collision.

二、流程:

  1. Find a path on the road map generated without collision-checking.

 

2. Delete the corresponding edges and nodes if the path is not collision free.

3. Restart path finding.


标签:Map,map,PRM,free,collision,points,phase,path,Probabilistic
来源: https://www.cnblogs.com/zhjblogs/p/15063108.html

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