next up previous contents index
Next: Noise Up: Frequency and time Previous: Frequency dependance   Contents   Index

Time dependance

For $ g_i(t)$ , we must separate the calibration of amplitude and phases since amplitude and phase errors have very different origins. The amplitude corrections are related to several effects: atmospheric absorption, receiver gain, antenna gain (affected by pointing errors, defocussing, surface status and systematic elevation effects), and correlation losses due to phase noise. Phase errors may come from delay errors, baseline errors, or a slow drift in atmospheric or receiver phases.



Gildas manager 2022-01-17