Method for reducing errors due to source amplitude modulation in

Details Method for reducing errors due to source amplitude modulation in Method for reducing errors due to source amplitude modulation in

1980-03-03

1981-12-01

Tubbesing, T. H.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

G01S 306

Patent

active

043039227

ABSTRACT:
A technique and apparatus are disclosed which greatly reduce error in sping antenna direction finding systems due to amplitude modulation of the source. A second omnidirectional antenna and its associated receiver are used in two alternative methods to reduce error. Embodiment one uses the second receiver, having automatic gain control, to control the gain of the first receiver, having input from the spinning antenna and outputting a signal for display. Embodiment two uses two log receivers, one receiving signals from the omnidirectional antenna and the other receiving signals from the spinning antenna. The outputs of the two log receivers are then combined and inputted to an amplifier which may have an inverse log characteristic and the amplifier signal outputted to a display.

REFERENCES:
patent: 2938206 (1960-05-01), Davis et al.
patent: 3165746 (1965-01-01), Whitnah
patent: 3296619 (1967-01-01), Alpers
patent: 3740750 (1973-06-01), Moulton
patent: 3895385 (1975-07-01), Alpers
patent: 3906505 (1975-09-01), Lipsky

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