Automatic direction finder antenna array

Details Automatic direction finder antenna array Automatic direction finder antenna array

1983-12-12

1989-05-23

Blum, Theodore M.

Communications: directive radio wave systems and devices (e.g.,

Directive

Beacon or receiver

342432, G01S 504

Patent

active

048334782

ABSTRACT:
An automatic direction finder antenna array having a plurality of pairs of oppositely positioned antenna elements arranged radially from a common center with each pair forming a cardioid radiation pattern when energized. Switching apparatus energizes successive antenna pairs to produce a rotating cardioid pattern but with the cardioid being switched back and forth 180.degree. at a higher switching frequency when each pair of antennas is energized during the rotating function. The antenna AX whose output bears the lowest ratio R to the output of its oppositely positioned antenna is determined as well as the antenna AZ having the largest output signal VZ. The precise angle of reception of a received signal is then determined from AX, AZ, and R.

REFERENCES:
patent: 3774216 (1973-11-01), Coleman et al.
patent: 3987446 (1976-10-01), Lipsky
patent: 4062015 (1977-12-01), Litva et al.
patent: 4158843 (1979-06-01), Kuchy
patent: 4163978 (1979-08-01), Shepherd et al.
patent: 4313117 (1982-01-01), Lipsky

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