Communications: electrical – Traffic control indicator – Combined
Patent
1994-11-30
1997-07-15
Horsass, Jeffery
Communications: electrical
Traffic control indicator
Combined
340933, 235384, 342 42, 342 44, 342 51, 342373, G08G 100
Patent
active
056487673
ABSTRACT:
A transponder detection system for detecting the presence at a detection area of a vehicle on which the transponder is mounted. Two antenna arrays are located on opposite sides of the detection area, and have their boresights directed to the detection area. For each array, a sum and difference signal of signals received from the transponder are measured. The sum channel signal is used to establish whether a transmission has occurred, and the difference channel signal is used to isolate any transponder that is at the detection area.
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Knittle Robert C.
O'Connor Roger J.
Denson-Low W. K.
Grunebach G. S.
Horsass Jeffery
Hughes Aircraft
Sales M. W.
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