Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite
Patent
1985-06-12
1987-06-23
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a satellite
342356, 342367, H04B 7155
Patent
active
046756809
ABSTRACT:
An antenna tracking device comprising an antenna which is so controlled in direction as to receive a plurality of beacon signals at different frequencies transmitted from a plurality of stationary satellites, respectively, which are spaced apart from each other by a relatively small distance, error detector connected to the feed of the antenna for detecting error signals each representing the difference between the incoming direction of each beacon signal and the axial direction of the main beam of the antenna, reference signal generator responsive to each beacon signal delivered to a receiver for generating a reference signal, and a tracking receiver which receives the reference signals and the error signals to generate the tracking error signals each consisting of mutually orthogonal components. The antenna tracking device of the type described above further includes synthesizer means for combining the components in the same directions of the tracking error signals from the tracking receiver, thereby generating the antenna driving signals. In response to these driving signals, the antenna is directed to the midpoint or center of a plurality of stationary satellites.
REFERENCES:
patent: 3156915 (1964-11-01), Lang et al.
patent: 3878522 (1975-04-01), Gurak et al.
patent: 4247857 (1981-01-01), Wilcke et al.
patent: 4334226 (1982-06-01), Eguchi et al.
patent: 4336542 (1982-06-01), Bielli et al.
M. Skolnik, Radar Handbook; pp. 8-7 through 8-13; (McGraw-Hill, 1970).
Blum Theodore M.
Gregory Bernarr Earl
NEC Corporation
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