The basic SATPS method may also be augmented by {HEAD ~ the use} of {TAIL ~ one or more reference stations} at known locations 
of
The basic SATPS method may also be augmented by { HEAD ~ the use } of { TAIL ~ one or more reference stations } at known locations
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH