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How to evaluate AMCL localization performance

Hi all,

I'm using amcl for localization in a mobile robot. Now succesfully I have it working on the robot. My idea is to use it with a laser scan and I will be modifying the readings so the information passed to the localization algorithm is somehow filtered.

What I want to do now is to evaluate the performance of one filter vs. the original data, is there any information that amcl output so I can do it?. I think I can use the spread of the particles, but seeing from the execution this doesn't always reflect the accuracy of the localization, as sometimes the variance is small but the robot is not in its right orientation.

Other way to ask the question would be: how can I compare odometry vs. laser base localization using amcl algorithm?

Thanks for your thoughts and ideas,

Ibraim