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global path effect on local planning

asked 2014-08-21 12:48:37 -0600

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??

thanks:))

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answered 2014-08-21 13:22:54 -0600

paulbovbel gravatar image

updated 2014-08-21 14:52:54 -0600

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).

http://wiki.ros.org/dwa_local_planner provides numerous references on how the algorithm works in detail.

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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 imagemohammad ( 2014-08-21 14:32:06 -0600 )edit

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

paulbovbel gravatar imagepaulbovbel ( 2014-08-21 14:43:23 -0600 )edit

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Asked: 2014-08-21 12:48:37 -0600

Seen: 608 times

Last updated: Aug 21 '14