| 摘要 |
<p>PURPOSE:To certainly and highly accurately direct an antenna system toward an aimed satellite by providing a shared circuit which receives the signal of a satellite whose position is clearly defined and the signal of the aimed satellite in the receiving circuit of an on-vehicle antenna device which performs transmission and reception. CONSTITUTION:A satellite 2 which becomes a positional reference, for example, BS control mode is selected by means of an antenna controller 15 and the longitude of the satellite and the latitude, longitude, and altitude of the position of a vehicle are inputted. Therefore, sweep signals and calculated thetaEB are respectively inputted to the AZ and EL axes of an antenna device 3 and the AZ axis is driven by one turn. Then the declination theta=thetaAZ1-thetaAZ of the direction of the vehicle from the true north is found by using the thetaAZ found from the latitude, longitude, and altitude of the vehicle position and the longitude of the satellite. Then an aimed satellite, for example, JCSAT control mode is selected by the antenna controller 15 and the longitude of the satellite is inputted. Thus an aimed satellite can be caught certainly and highly accurately.</p> |
