Path planning for car-like robots

asked 2011-11-01 10:12:20 -0600

Sagnik
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Hi,

I am developing a path-planner for a 4 wheeled car-like robot. I have a 2D map of the environment with the initial coordinates of the robot and the final coordinates known. A straight-forward solution would be to use A* or any general path planning algorithm like it, but the challenge I see is in ensuring that the curvature in the path is achievable by a 4 wheeled (non-holonomic) robot.

Also, as a second step, the robot uses a visual marker (hung on a wall in front of it) to localize itself. So the path planned should ensure that the robot's heading is such that the marker is always in view.

Does ROS have packages that I could use or take ideas out of ?

Thanks, Sagnik

answered 2011-11-01 19:58:04 -0600

Stefan Kohlbrecher

24361 ●173 ●299 ●444 https://www.energy-rob...

We use the sbpl lattice planner (http://www.ros.org/wiki/sbpl_lattice_planner) on our four wheel drive/steering Hector UGV. You can specify the allowed motion primitives as described in the documentation. The plan will then only consist of valid motion for you Ackermann-steered vehicle. The only problem then is to follow this trajectory exactly, which move_base doesn't do in my experience.

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Hi, I was able to install sbpl lattice planner as suggested and could run the move_base_sbpl_fake_localization_2.5cm.launch file (Section 2.2 of http://www.ros.org/wiki/sbpl_lattice_planner ). But how do I actually go ahead and set a goal and see a plan being generated ?

Sagnik ( 2011-11-28 07:59:24 -0600 )edit

I tried setting a goal using RViz but it doesn't seem to work. If you could point to some tutorial demonstrating the usage of sbpl_lattice_planner, that would be great. Thanks !

Sagnik ( 2011-11-28 08:00:44 -0600 )edit

You don't need a tutorial that is specific to the sbpl_lattice_planner. You should look at the documentation for the navigation stack (move_base etc.). The lattice planner is just one of many different global planners that could be used - and they are all interfaced with in the same way.

ben ( 2011-11-28 11:46:10 -0600 )edit

Also - when setting the goal in rviz - make sure that the global frame of the world is '/map'.

ben ( 2011-11-28 11:46:36 -0600 )edit

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