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How to improve/tune Amcl performance

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Hello friends, I managed to run amcl_omni.launch without any warning info but mapping performance is really low. I used scanse sweep lidar in 10 Hz , I checked the data in rviz it looks reasonable . I also create map with this lidar , I think it's working as expected. I am using mit-racecar configuration as car and vesc , I get odom data from mit-racecar github repo, I did not edit any part of it gives me data I am not sure if it is correct but when i check it as rostopic echo /tf i see odom -> base_link tf is reasonable. At rviz i set pose estimation point , it sets closely to real place , so many poses appear . When i move car around map pose numbers not getting lower, laser points not getting match with wall. How should i fix these problem . I tried amcl_diff.launch and amcl_omni.launch. Both of them not working correctly.

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