Beam aberration correction technique for a BWG antenna

A technique for a real-time beam aberration correction scheme for deep space uplink and downlink communications is presented. This technique provides a closed-form relationship between the beam aberration angles and the corresponding feed displacement for a reflector antenna with a beam waveguide (BWG) or multiple reflector system. This algorithm will enable one to accurately predict the movement of the feed in real time for a known beam deviation while the antenna is tracking a spacecraft. It is also useful to determine the feed offset position needed to correct for the beam deviation due to an imperfect antenna mechanical structure, and subreflector and mirror misalignments for a complex multiple reflector system.