Associating timestamp to images when external trigger via a GPS receiver.

[hirenpatel1207]

Hi,
We have the flir blackfly S USB camera being trigger via a 10Hz signal coming from a GPS receiver. The tirggering works fine and the frame rate is 10Hz. However, my understanding is the ROS driver associates the timestamp from the computer when the image arrives by simple getting the rostime at that instance.
Is there a way to get correct timestamped synchronization?
The GPS device can publish NMEA timestamp messages over a serial connection.