Ask Your Question

global path effect on local planning

asked 2014-08-21 12:48:37 -0500

mohammad gravatar image

hi everyone

I am interseted in pathplanning and i try to build my robot. As i understood, we can use navfn package for global pathplanning which means a path from the current robot state to the goal state. Another package that we should use is base_local_planner or something like it that works in velocity space and publishes messages for base controller. Something that i can not understand is relationship between these two planners. How a planner like DWA or Trajectory Rollout or other local planners considers this path? I mean does this path effect the calculation for our local commands? Is there any reference which discusses this subject in a mathematical manner??


edit retag flag offensive close merge delete

1 Answer

Sort by ยป oldest newest most voted

answered 2014-08-21 13:22:54 -0500

paulbovbel gravatar image

updated 2014-08-21 14:52:54 -0500

Global planning generates a set of waypoints between one location and another, while local planning takes those waypoints and calculates the trajectories, and outputs velocities (to execute the trajectories). provides numerous references on how the algorithm works in detail.

edit flag offensive delete link more


I think global navigation means having a map which is travelled by localization and move_base packages. In this kind of navigation we have two planners too. A planner which construct a path and a planner for velocity command based on DWA. I think these two planners work at same time and they depends each other. In the local planner we dont have any map and localization but also these two planners work again. But i dont how they effect each other. Do you?? In this reference there is no expalanation about this.

mohammad gravatar image mohammad  ( 2014-08-21 14:32:06 -0500 )edit

Sorry that was confusing, edited my answer above. Global/local navigation->planners

paulbovbel gravatar image paulbovbel  ( 2014-08-21 14:43:23 -0500 )edit

Your Answer

Please start posting anonymously - your entry will be published after you log in or create a new account.

Add Answer

Question Tools

1 follower


Asked: 2014-08-21 12:48:37 -0500

Seen: 894 times

Last updated: Aug 21 '14