Communications: directive radio wave systems and devices (e.g. – Directive – Including antenna orientation
Patent
1992-12-10
1995-06-06
Issing, Gregory C.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including antenna orientation
342 76, 342 92, H01Q 300, G01S 1300
Patent
active
054226481
ABSTRACT:
A receiving antenna apparatus for receiving broadcast by satellite and adapted for mounting on a mobile body in which radio wave interruption tends to occur by obstacles, attains high-speed automatic tracking function capable of catching the satellite again in a short time just after cutting off of radio waves. In the receiving antenna apparatus, an incoming direction of radio waves is roughly detected to limit a search area and then a gain of the tuners is reduced to a value in the tracking control capable of detecting a peak and confirming a main lobe in accordance with power level of the received signal, so that a narrow and fine search may be made only in the limited search area. The antenna apparatus includes a gain setting device for varying gains of AGC of the tuners. Upon searching for the satellite, gains of the tuners are set to a first gain by the gain setting device to perform the rough search and the gains of the tuners are reduced to a second gain level lower than the first gain to perform the fine search. Thus, a time required to catch the satellite after cutting off of radio waves can be reduced.
REFERENCES:
patent: 3197771 (1965-07-01), Mintzer et al.
patent: 3206754 (1965-09-01), Morris
patent: 4030099 (1977-06-01), Valenti et al.
patent: 4331960 (1982-05-01), Gerst, Jr. et al.
patent: 4801940 (1989-01-01), Ma et al.
patent: 5061936 (1991-10-01), Suzuki
Patent Abstracts of Japan vol. 13, No. 245 (P881) 8 Jun. 1989 & JP-A-01 046 670 (Mitsubishi Electric Corp.) 21 Feb. 1989 *abstract*.
Patent Abstracts of Japan vol. 13, No. 467 (p-948) 23 Oct. 1989 & JP-A-01 184 482 (NEC Corp) 24 Jul. 1989 *abstract*.
Kato Kazuo
Ochiai Makoto
Ojima Takashi
Uematsu Masahiro
Issing Gregory C.
Nippon Steel Corporation
System Uniques Corporation
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