Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1980-03-20
1982-03-02
Hubler, Malcolm F.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
G01S 504
Patent
active
043181066
ABSTRACT:
A variable aperture direction finding system which uses a circular array of vertical receiving antennas connected to a capacitive type goniometer located in the center of the array to receive signals from radio frequency transmission sources. The goniometer has a stator plate for each antenna and a number of rotor plates which allow for the provision of selecting suitable apertures and antenna combinations to form Lobe or Split-lobe directional patterns. The goniometer's rotation is controlled by a servo drive system which provides for both manual positioning as well as automatic operation from a remote control unit.
The system utilizes a remote control panel to allow selection of either manual or automatic rotation, azimuth indication, aperture and pattern selection, and manual positioning of the goniometer.
An azimuth indicator system is driven in synchronization with the goniometer. The bidirectional bearing of the incoming signal may be determined using the manual/aural method, or visually using the automatic mode and the visual indicator unit.
A visual indicator unit, also driven in synchronization with the goniometer, displays a visual representation of the strength of the received signal relative to the instantaneous azimuth. The receiver audio is converted to a voltage and displayed vs the azimuth on a long-persistence CRT which has a deflection yoke rotating synchronously with the goniometer. The audio voltage may also be fed to a capacitive integrator drum rotating at two times the goniometer speed to average both nulls of the received signal to minimize pattern shift and site errors while also serving as a memory storage for short duration signals. The visual unit has provision for display of Lobe, Split-lobe, and Null-lobe patterns.
REFERENCES:
patent: 3546698 (1970-12-01), Kaltschmidt
patent: 3701155 (1972-10-01), Adams
patent: 4129874 (1978-12-01), Luedtke et al.
Bentley Wm. Ferrel
Hubler Malcolm F.
The United States of America as represented by the Field Operati
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