Laser link mode
|column 1: On board time in UTC (YYYY-MM-DDTHH:MM:SS.SSSSSS)
||The time when a command of the LIDAR was issued is shown as UTC time for valid data. In the laser link mode, it corresponds to the time when the LIDAR started waiting for the laser pulses from a ground laser station.
|column 2: Stop1 timing
||The LIDAR has a 17-bit counter with frequency of approximately 300 MHz (3.3 ns per bit) for ranging. In the laser link mode, the laser diode is triggered by first laser reception, then after a period of laser excitation, shown as gStart timingh, a laser pulse is emitted from the LIDAR. Stop1 timing shows a raw counter value of the interval between first detected pulse and laser diode trigger time in this mode.
|column 3: Stop2 timing
||In the laser link mode, the LIDAR can receive up to two laser shots from the ground station during 1-sec waiting period. Stop2 timing shows the interval between two received pulses.
|column 4: Start timing
||Start timing shows a raw counter value of the interval between laser diode trigger time and laser emission after laser diode excitation. Therefore, the internal delay in the instrument is expressed as Stop1 timing + Start timing.