The number of non coherent passes defines the number of times the search engine steps through {TAIL ~ the PN offsets} designated by {HEAD ~ the search window} 
The number of non coherent passes defines the number of times the search engine steps through { TAIL ~ the PN offsets } designated by { HEAD ~ the search window }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD