Communications: directive radio wave systems and devices (e.g. – Directive – Including a steerable array
Patent
1987-12-14
1989-08-15
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a steerable array
342378, 342417, 342445, H01Q 300, G01S 502
Patent
active
048579378
ABSTRACT:
In, for example, a passive direction-finding radio receiver employing a multi-beam antenna which has e.g. ninety-six feeds which form a corresponding number of overlapping reception beams, the output signal amplitudes of the various feeds can be compared with a reference to yield a sequence of binary digits, e.g. as shown in FIG. 2. The position of a radio source is given by the position in the sequence of the center of the largest group of "1"s. In order to quickly determine this position the sequence is subjected repeatedly to a processing operation in which each "1" which does not have "1"s as its two immediate neighbors is changed to a "0", thereby repeatedly stripping the two end "1"s off each group of "1"s until none remain. The required position is that of the single "1" or pair of "1"s present immediately before all have become "0"s.
REFERENCES:
patent: 3643075 (1972-02-01), Hayes
patent: 3747098 (1973-07-01), Kirkpatrick et al.
patent: 4014023 (1977-03-01), Kirkland
patent: 4229739 (1980-10-01), Smith
Cain David
Kraus Robert J.
Tarcza Thomas H.
U.S. Philips Corporation
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