Baseband analysis is performed in order to detect and identify reflective signals, and {HEAD ~ spectrum analysis} is performed in {TAIL ~ order} to detect and identify active signal sources 
is performed in
Baseband analysis is performed in order to detect and identify reflective signals , and { HEAD ~ spectrum analysis } is performed in { TAIL ~ order } to detect and identify active signal sources
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH