Discrete fourier transform direction finding apparatus

Details Discrete fourier transform direction finding apparatus Discrete fourier transform direction finding apparatus

1988-03-07

1989-10-24

Tarcza, Thomas H.

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

Directive

Beacon or receiver

342194, 342195, G01S 502, G01S 1300

Patent

active

048765490

ABSTRACT:
A discrete fourier transform direction finding apparatus for performing a direction finding function on signals received through two antennae separated by a known distance. The outputs of the respective antennae are connected to first and second receiver channels which convert the received signals down to baseband and provide orthogonal I and Q channel outputs. A common local oscillator is used to maintain phase coherency between the channels and AGC signals are provided to maintain identical delays in the receiver RF paths. The processed signals from each receiver channel are than fed into a respective charge coupled device Chirp-Z transform (discrete fourier transform) circuit to produce real and imaginary components of the received signals. These signals are then converted to digital form and are used by subsequent circuitry to determine the angle of arrival of the received signal.

REFERENCES:
patent: H922 (1987-06-01), Klose et al.
patent: 3449748 (1969-06-01), Thyssens
patent: 3500414 (1970-03-01), Woerrlein
patent: 3540053 (1970-11-01), Sparagna et al.
patent: 4034376 (1977-07-01), Barton
patent: 4170774 (1979-10-01), Schaefer
patent: 4443801 (1984-04-01), Klose et al.
patent: 4486757 (1984-12-01), Ghose et al.
patent: 4532515 (1085-07-01), Cantrell et al.

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