Garmin LIDAR-Lite v1 Silver Label Operating Manual page 23

The correlation waveform has a bipolar wave shape, transitioning from a positive going portion to a roughly
symmetrical negative going pulse. The point where the signal crosses zero represents the effective delay for
the reference and return signals. Processing with the SPC determines the interpolated crossing point to a
1cm resolution along with the peak signal value.
The figure below illustrates a correlation record example for a long­range system using an avalanche
photodiode or APD and laser with a processing chip with a half resolution 2­foot/correlation steps and
two­thousand element signal record. The target is at 660 meters and forms the same bipolar correlation
wave shape as in the short­range system, but in practice the correlation waveform must be distinguished
from background noise present in the correlation record. A correlation record detection threshold is
established based on the background noise and if no signals are detected above this threshold, a no signal
status indication is provided.
LIDAR­Lite v1 "Silver Label" Manual​ , Updated: 08/13/15