Communications: directive radio wave systems and devices (e.g. – Directive – Beacon or receiver
Patent
1988-04-07
1989-07-04
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Beacon or receiver
G01S 502
Patent
active
048455024
ABSTRACT:
A direction finding method and apparatus utilizes two receiving antennas which are disposed on a baseline that is rotated around its midpoint at a constant angular velocity. Signals received from a transmitter by the antennas are processed by circuitry that includes a balanced mixer. The balanced mixer multiplies the signals from the two antennas, which are time varying and of different phase due to their rotation and spacing. The output from the balanced mixer is a signal which includes a high frequency component, and a low frequency component. The high frequency component can be used to determine incoming signal amplitude and frequency. The low frequency component can be used to determine the azimuth and elevation angles of the transmitter relative to the plane of rotation of the receiver through analysis of the signal at a number of different times.
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Carr James L.
Maxwell Marvin S.
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