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This page has information on the actual xml structure: http://answers.ros.org/question/44691/how-to-put-hokuyo-laser-sensor-on-p2os/

As for those meanings, I found some information here on rangecount and raycount: http://osdir.com/ml/science.robotics.playerstage.gazebo/2008-08/msg00044.html

rangecount is the amount of data to export. Raycount is the number of rays to simulate in gazebo. Since these can be computationally expensive, each rangecount will be interpolated to the nearest raycount if raycount < rangecount. For best sensor simulation, raycount = rangecount.

There's no clear use for lasercount anywhere, other than 1. I'd assume it's the number of planar lasers, the number of stacked lasers, or the number of returns.

Finally, the Gaussian noise is the amount of simulated noise to add to each reading. Gazebo supports "noisy" data by adding data in a distribution with that number as the variance.