what is the Timestamp ?

timestamp

asked 2014-08-12 12:41:09 -0500

Naz
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1-Can someone please explain what exactly is the timestamp that is sent along with every message regardless of the data type ? This number is huge and its in the range of 4.7x10^18 .

2- For synchronization between GPS and for example IMU, can we simple look for the closest Timestamp and regard them as one ?

Thanks,

Naz

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answered 2014-08-12 13:00:18 -0500

bvbdort

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updated 2014-08-12 18:37:42 -0500

tfoote

58457 ●128 ●550 ●526 http://www.ros.org/

In ROS messages timestamp is taken from your system, which is unix epoch time.

Check Unix epoch time here.

For synchronisation look message_filters

Documentaiton of the datatypes are at: http://wiki.ros.org/rospy/Overview/Time and http://wiki.ros.org/rospy/Overview/Time

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Also, if the workstation and the device are significantly off, you can sync the two with chrony. Just mentioning because it took me too long to figure out...