| 摘要 |
PURPOSE:To attain a reduction of weight and to obtain high reliability and at the same time to facilitate the control of antenna direction, by setting a tracking receiver, etc. at an earth station to detect an error angle of azimuth for an antenna mounted on a satellite, and decreasing the number of equipments mounted on the satellite. CONSTITUTION:A satellite 16 transmits signals of frequencies Fa and Fb via a main reflector 19, and received at an earth station 18 through an antenna consisting of a main reflector 20a and a primary radiator 21a. Then long and short axis components are extracted, and the sum and difference signals of frequencies Fa and Fb are separated each other through a filter circuit 23. Monopulse tracking receivers 24a and 24b obtain error signals which are proportional to error angles of azimuth E and Ez from the signals of frequencies Fa and Fb, respectively. Both error signals are transmitted to the satellite 16 after applying frequency modulation and frequency conversion. The satellite 16 converts the frequency of the received signal and supplies the signal to a driving controller 35 after demodulation to control the azimuth of a transmitting antenna. |
