Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1983-08-04
1985-01-15
Blum, Theodore M.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343465, H04B 7185, G01S 502
Patent
active
044941196
ABSTRACT:
A dedicated distress radiolocation system combines direction-finding techniques with calculations based on signal strength to precisely locate a distress transmission and effect rescue of the person or property in distress. The system is capable of locating a distress transmission solely on the basis of a short duration pulse; however, for identification purposes and for communication reliability a series of pulses is transmitted. The system includes distress transmitters, a plurality of slave repeater units at known locations to receive the distress transmission and report their signal strength to a central station, a central station to calculate the distress transmitter's location based on the measured signal strengths and the known locations of the repeater units and to dispatch a rescue unit, and rescue units equipped with direction finding equipment to approach the distress transmitter. Most actions of the system are undertaken automatically.
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122923 Canada Limited
Blum Theodore M.
Issing Gregory C.
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