H - Electricity – 01 – Q
Patent
H - Electricity
01
Q
H01Q 1/27 (2006.01) G01S 3/38 (2006.01) G01S 3/48 (2006.01)
Patent
CA 2084973
A receiving antenna apparatus for broadcast by satellite for mount 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 tuners is then 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, 80 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 tuners. Upon search of 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 lower than the first gain to perform the fine search. Thus, a time required to catch the satellite again after cutting off of radio waves can be made reduced.
Kato Kazuo
Ochiai Makoto
Ojima Takashi
Uematsu Masahiro
Gowling Lafleur Henderson Llp
Nippon Steel Corporation
System Uniques Corporation
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