Stepped cardioid bearing system

Details Stepped cardioid bearing system Stepped cardioid bearing system

1973-12-13

1976-04-13

Wilbur, Maynard R.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343118, G01S 156

Patent

active

039507530

ABSTRACT:
An antenna system having a central radiator element and one or more surrounding rings of parasitic elements which can be tuned or actuated separately in each ring by electrical commutation to provide a stepped cardioid radiation or receiving pattern. When the radiator element and a ring of parasitics are used to transmit a cardioid, its stepped pattern contains a fundamental sinusoidal component which can be extracted by a filter at a receiver and used to provide a TACAN/VORTAC bearing determination by comparing its phase with a reference signal transmitted once per revolution of the pattern to mark a predetermined position in its rotation, as is common in TACAN systems. When the cardioid pattern comprises transmitted squitter pulses, care is taken to ensure actual transmissions marking each stepping of the antenna pattern in order to provide optimum bearing information.

REFERENCES:
patent: 3195133 (1965-07-01), Shames
patent: 3560978 (1971-02-01), Himmel et al.
patent: 3790942 (1974-02-01), Becavin et al.

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