Hi Eitan,
I checked it again. When I brought up everything and gave the goal then
robot moved exactly 50cm.and move_base gave warning 
[ WARN] [1287061523.190895504]: Control loop missed its desired rate of
20.0000Hz... the loop actually took 0.5249 seconds
Then again I gave the goal by using simple_navigation_goal node. it again
moved 50cm forward and move_base gave
[ WARN] [1287061727.174068853]: Control loop missed its desired rate of
20.0000Hz... the loop actually took 0.4975 seconds

I use the same code given on the page
http://www.ros.org/wiki/navigation/Tutorials/SendingSimpleGoals

any clue please?

regards


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