Approximate noise temperature calculations of offset gregorian reflector systems

摘要

Accurate antenna noise temperature calculations of an offset Gregorian reflector system over a wide frequency band is computationally expensive. The main reflector masking technique, which removes the main reflector from the calculation domain, considerably reduces the computational cost, but for an electrically small reflector system, diffraction effects affect the accuracy. Recently improvements to this technique were proposed by introducing correction factors. In this paper we investigate the improvement in accuracy using higher order compensation factors, frequency subdivision, and direct interpolation of the residual of the antenna temperatures.