The transceivers and reflectors are aligned such that {TAIL ~ uninterrupted reflected beams} are sensed by {HEAD ~ the emitting transceiver} 
The transceivers and reflectors are aligned such that { TAIL ~ uninterrupted reflected beams } are sensed by { HEAD ~ the emitting transceiver }
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD