| 摘要 |
PURPOSE:To keep the quality of a satellite communication line excellent, by fetching a data of intermodulation product appeared on the outgoing line of the satellite to the computer of a line monitor station on ground, grasping an accurate operating level of a satellite repeater so as to control the transmission power of an earth station. CONSTITUTION:A line monitor control station 3 on ground fetches a data of the intermodulation product in the spectrum of the output of a satellite repeater displayed on a spectrum analyzer 12 to a computer 13 and calculates the all input level to the repeater in a satellite 1 with the software processing, and further, discriminates whether or not the operating level of the repeater mounted on the satellite is suitable based on the calculated level values. If the operating level of the repeater mounted on the satellite is discriminated that it is not suitable, the amount of increase/decrease in the output of each earth station output required for the operation of the optimum operating level is calculated and determined. As a result, the calculated increase/decrease amount is supplied to a pilot signal transmitter 14 of the line monitor station, where a shallow phase modulation is applied to the pilot signal, and the result is transmitted to each station. |
