| 摘要 |
A beam 402 emitted by a satellite 110 produces a footprint on the ground typically a circle or ellipse, A. The power of the beam, p(r), varies across the footprint and falls off most steeply around the periphery of the footprint, P. Multiple monitoring stations, 406(1), 406(2), 406(3), are distributed around the periphery of the footprint. Each of these monitoring stations measures the power of the beam at its respective location and the power measurements are used to detect beam misalignment. A control signal is transmitted to the satellite to correct the misalignment. Either a user beam or a gateway beam may be monitored and gateway beam power measurements may be used to correct the alignment of the user beam. There are preferably at least eight monitoring stations. |
