Mission Planner Logs

Hi,

I need to use RFND log for one of my UAV magnetic processing job.
I would like to know the definition of the parameter for RFND.
TimeUS : How this time is recorded? how can I covert it to real time?
Dist: In which unit this distance is recorded? is it km?
Stat1: What does it mean by Sensor State?
Orient: What does it mean by Sensor orientation?

Thank you,
Sumana