Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1984-01-05
1985-07-30
Blum, Theodore M.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
364452, G01S 124
Patent
active
RE0319627
ABSTRACT:
LORAN-C navigation apparatus is disclosed wherein digital circuitry and a microprocessor [is] are used to automatically identify LORAN transmitting stations and [makes] make standard hyberbolic navigation measurements. The equipment operator manually enters the group repetition rate into the apparatus for a LORAN-C chain covering the area within which the navigation apparatus is being operated. Initially, the apparatus searches all incoming signals as they are received until signals from a master station are received regularly at the stored group repetition rate. The apparatus then closely determines the time of arrival of signals from the secondary stations of the selected LORAN-C chain before changing to a fine search mode in which the exact time of arrival of the secondary station signals is determined; the phase code of the received signals is checked to determine if the received signal is a ground or sky wave, and a determination is made if there is a defective secondary station blink code. The time difference of arrival measurements are then output visually to be plotted in a well known manner on a LORAN-C chart to locate the position of the craft upon which the apparatus is located.
REFERENCES:
patent: 3731207 (1973-05-01), Holyman
patent: 3868691 (1975-02-01), Miller et al.
patent: 3921076 (1975-11-01), Currie
patent: 3947849 (1976-03-01), Fehiner et al.
patent: 4134117 (1979-01-01), Robinson et al.
Blum Theodore M.
Etlinger Louis
Porter, Jr. Wm. F.
Sanders Associates Inc.
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