Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1972-02-18
1978-10-17
Buczinski, S. C.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343119, G01S 502, G01S 504
Patent
active
041212169
ABSTRACT:
Unambiguous 360.degree. high frequency direction finding is achieved by the use of an energy receiving antenna having two orthogonally mounted vertically oriented, loop antennas, a monopole antenna and a horizontally oriented loop antenna. Signals from the two orthogonally mounted loop antennas contain bearing information for processing in a phase comparison system. The monopole antenna signal provides for elimination of any ambiguity in the bearing information signal as received from the two orthogonally mounted loop antennas. Sensing the polarization of the energy waves at the receiving antennas is provided by comparison of the horizontal loop antenna signal with the resultant signal obtained by the quadrature summation of the signal from the two vertical loop antennas. A bearing indication from the two orthogonally mounted loop antennas is generated by phase shifting one of the antenna signals. This phase shifted signal is combined with the second loop antenna signal in both a summing network and a difference network. A phase detector coupled to the summing network and the difference network provides a signal representing a multiple of the bearing angle between the emitting source and the receiving antenna. The ambiguity in this multiple of the bearing angle is removed by coupling a phase detector to the summing network and the monopole antenna. The output of this second phase detector is combined with the output of the first phase detector in an ambiguity resolver to produce a true bearing angle.
REFERENCES:
patent: 1839290 (1932-01-01), Bailey
patent: 2256619 (1941-09-01), Luck
patent: 3355736 (1967-11-01), Perper
patent: 3369235 (1968-02-01), Odams et al.
patent: 3392392 (1968-07-01), Magnuski
Bunch Carroll S.
Marcucci Robert L.
Perry Jerry L.
Buczinski S. C.
E-Systems Inc.
Wilder Robert V.
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