Each receiver includes a light collection and delivery system, a position sensitive detector, and an associated ratio metric signal processor, or similar means for {HEAD ~ extraction} of height and intensity information or {TAIL ~ data} by triangulation 
Each receiver includes a light collection and delivery system , a position sensitive detector , and an associated ratio metric signal processor , or similar means for { HEAD ~ extraction } of height and intensity information or { TAIL ~ data } by triangulation
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH