Sensitivity Analysis of the Feed System for the TM VGOS Telescope

The demand for higher precision measurements in Very Long Baseline Interferometry (VLBI) continues to grow, which drives the technical development of next generation international VLBI stations called the VLBI Global Observing System (VGOS). Up to now, there are several VGOS stations in the world. China also has built China’s VGOS station in Shanghai. The TM VGOS telescope is a new station with a diameter of 13.2 meters and a ring-focus sub-reflector, which works in the 3-14 Ghz range with dual-linear polarization to provide VGOS capability. In this paper we present the estimated performance, focusing on the achievable system equivalent flux density (SEFD) which is an important indicator of the antenna receiving system. In addition the measurement results and method of SEFD of the antenna system are introduced.