Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1980-03-03
1982-07-13
Hubler, Malcolm F.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343118, 364458, G01S 504
Patent
active
043397557
ABSTRACT:
A pair of scanning, directional receiving antennas mounted in spaced relation on a monitoring aircraft are synchronously driven at a given scan rate .omega..sub.s and at the same phase angle with respect to the broadside of the antenna pair so that the receiving beams of the antennas are always parallel. A non-scanning source of RF radiation, located at an unknown range from the monitoring aircraft, emits radiation that is received by the scanning antennas at a slight time differential t.sub.21. The received source radiation is converted by separate receiving channels into early and late arriving signals, from which a time interval signal representing t.sub.21 is produced. Concurrently therewith, an angle of arrival .phi. of the source radiation is detected and a signal representative thereof is produced. Also, signals are generated that represent the scan rate .omega..sub.s of the receiving antennas and a distance d equal to the separation between the antennas. From these signals, a range signal R is produced that corresponds to the distance between the monitoring aircraft and the source of RF radiation.
REFERENCES:
patent: 2509207 (1950-05-01), Busignies
patent: 2794594 (1957-06-01), Ergen et al.
patent: 2919350 (1959-12-01), Taylor et al.
patent: 3406397 (1968-10-01), Easton et al.
patent: 3515342 (1970-06-01), Brunk
patent: 3789410 (1974-01-01), Smith et al.
Hubler Malcolm F.
The Boeing Company
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