Communications: directive radio wave systems and devices (e.g. – Directive – Utilizing correlation techniques
Patent
1993-03-30
1998-12-22
Issing, Gregory C.
Communications: directive radio wave systems and devices (e.g.,
Directive
Utilizing correlation techniques
342442, 342424, G01S 316, G01S 504
Patent
active
058524207
ABSTRACT:
An antenna system is made up by a main antenna and a sub antenna which is adjacent the main antenna in a direction not perpendicular to the direction of beam scan of the main antenna and which has a beam axis coincident with a beam axis of the main antenna. Antenna beams of the antenna system are scanned by a scan device. Received signals of both the antennas are subjected to a multiplication process under phase coherent condition in a phase-coherent multiplying device. A signal corresponding to a maximum frequency component in the output signal of the phase-coherent multiplying device is output by a frequency discriminating device and then subjected to a signal conversion process in a signal converting device. Information about a radio wave source only in the direction of the antenna beams is thus obtained.
REFERENCES:
patent: 2990544 (1961-06-01), La Rosa
patent: 3154778 (1964-10-01), Kock
patent: 4888593 (1989-12-01), Friedman et al.
patent: 5021793 (1991-06-01), Stangel et al.
European Search Report, dated Oct. 18, 1993.
Issing Gregory C.
National Space Development Agency of Japan
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