Cancellation of group delay error by dual speed of rotation

Details Cancellation of group delay error by dual speed of rotation Cancellation of group delay error by dual speed of rotation

1981-05-06

1983-12-27

Blum, Theodore M.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

G01S 144

Patent

active

044234201

ABSTRACT:
Radio direction finders using the principle of periodic scanning of a circular array inherently display a bearing error related to the group delay through the receiving, detection and evaluation process. Correcting by subtracting a constant .theta..sub.o is simple but it is difficult to keep .theta..sub.o constant. The present invention cancels the group delay error instead of compensating for it with a predetermined constant. Scanning is done at angular velocities .OMEGA..sub.1 and .OMEGA..sub.2 for m turns and n turns respectively. The parameters are related by the formulae

REFERENCES:
patent: 3950753 (1976-04-01), Chisholm

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