Field of View and Size of Antennas
•If primary beam of antenna is >> solar diameter, then imaging is easy.
•If primary beam of antenna is << solar diameter, imaging of small regions in the disk is relatively easy.
•If primary beam of antenna is comparable to the solar diameter, good imaging is hard.
–Pointing is most critical
–Short spacing measurements become very important for good imaging
–Short spacing measurements are hard to obtain in this regime (can’t get the antennas close enough together).
•Calibration may set a minimum size of antenna.
•An important design choice, tied to array configuration.