PulseLength_normalized_18dB is an analysis export variable.
It reports the length of a single target pulse (at 18dB down from the peak) normalized to the transmitted pulse length (-).
This variable is exported with all single target analyses.
About analysis
About analysis variables
Single target pulse properties
PulseLength_normalized_PLDL
PulseLength_normalized_6dB
PulseLength_normalized_12dB
Pulse_start_normalized_18dB