Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1982-02-09
1985-10-15
Blum, Theodore M.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343395, 364452, 455 77, 455195, G01S 364
Patent
active
045477779
ABSTRACT:
A method of radio-position-finding by means of mapped contour lines of iso-phase shift between two radio-frequency waves separated by a low frequency and transmitted by a group of foci stations also emitting a reference wave associated with said two radio-frequency waves and modulated upon said low frequency, consisting in determining in a receiver set the low frequency from which fundamental frequencies are received and as a reference value the low frequency which is modulated upon the reference wave and defines through comparison of the values thus obtained the relative phase shift of both fundamental frequencies, and likewise determining the phase shift between the fundamental waves transmitted by another group of foci stations, and comprising the steps of using one single receiving channel, determining during successive periods the low frequencies from the fundamental waves and the low reference frequencies, correcting through computation the values thus obtained for removing the shift in time and then comparing the values corresponding after their correction to the same times for obtaining the phase shifts.
REFERENCES:
patent: 3689926 (1972-09-01), Honore et al.
patent: 3968493 (1976-07-01), Last et al.
patent: 3974502 (1976-08-01), Phipps
patent: 4092594 (1978-05-01), Baker
patent: 4368541 (1983-01-01), Evans
Blum Theodore M.
M.L.R. Electronique
Sotomayor John B.
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