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peak and the crossing data (now the next largest peak sample) is stored to allow post processing of the data
to extract the distance and peak value. The secondary peak in some cases may be the small reflection of
the beam passing through a window or possibly the reflection off objects in the foreground.
The figure below details the processing flow within the correlation processor after a final correlation
waveform is complete.
The processed correlation waveform is processed and the various extracted parameters are stored in the
external register space. For both the reference and signal records, the coarse record delay and the positive
and negative correlation samples are processed to determine the delay in the record to the correlative peak.
The difference between the delay measured for the signal and reference determine the effective round trip
delay to the target. The delay is scaled to produce a result in centimeters. Signal strength is determined by
multiplying the peak value of the correlation by the scaled inverse of the number of acquisitions. It is an
inverse relationship because more samples are required to increase the strength of a small signal than a
larger one. A valid signal is determined by comparing the signal peak value with the value of the noise floor
observed in the range record.
LIDARLite v1 "Silver Label" Manual , Updated: 08/13/15
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