Question: For east-west telescope array, in u,v,w coordinate, its w=0. I want to know for north-south telescope array, Is its w equal to 0? Thanks — Shui
Answer: In fact, the w-coordinate in an interferometer points in the direction of the source being measured. More generally, the (u,v,w) coordinate system is aligned with (east,north,toward phase tracking center). The w-coordinate would be equal to zero for a planar array.