Radio direction finding system

Details Radio direction finding system Radio direction finding system

1977-04-21

1979-04-03

Wilbur, Maynard R.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343113DE, 343118, G01S 140, G01S 354

Patent

active

041480341

ABSTRACT:
A radio direction finding system including a transmitter and associated antenna located at one end of a radio communication path and a receiver and associated antenna at the other end. One of the antennas is characterized by an omni-directional pattern. The other antenna is characterized by a rotating, directional antenna pattern which is periodically reversed in direction at a rate low compared to its rotation frequency, but high compared to changes in bearing occurring between the transmitter and receiver. The periodic modulation of the RF signal caused by the rotating antenna pattern is detected by the receiver which generates a demodulated output signal. This demodulated signal is averaged over a period including the two directions of antenna rotation, with the result that the bearing error portions cancel, yielding a bearing-indicating signal which is relatively free from receiver-introduced phase error.

REFERENCES:
patent: 2861264 (1958-11-01), Lair
patent: 3094697 (1963-06-01), Kramar et al.
patent: 3670337 (1972-06-01), Earp et al.
patent: 3778831 (1973-12-01), Marchand

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