In FIG. 7, as the satellite 700 follows the path 714, the area 726 tracks along the surface of the Earth. In this way, the communication target 722, which is shown centered in the area 726 for clarity, is within the angular range of the antenna system 712 for a period of time. During that time, signals communicated between satellite 700 and the communication target 722 are subject to bandwidth constraints, including but not limited to signal strength and calibration of the signal beam 724. In an example, for phased array antenna systems, the signal beam 724 is generated by an array of mutually coupled antenna elements, wherein constructive and destructive interference produce a directional beam. Among other factors, phase drift, amplitude drift (e.g., of a transmitted signal in a transmitter array), and so forth affect the interference properties and thus the resultant directional beam or subbeam.
