Changes/gpcal

gpcal
Item	Complexity	Research	Milestone	Time
XYPhase	easy	some	6	2d
Wide band calibration	hard	moderate	10	20d

Things to Change

• potential XYPhase issue
• wide band calibration option - add option to split wide frequency band in a number of sub-bands for gain and leakage calibration and derive spline fits across the frequency range instead of scalars.

Research:

• check whether gpcal reads xyphase from input uv data. At present this is in a variable? No, xyphase from syscal record can be applied in atlod and is stored in a uv variable (xyphase), but is not read by the calibration tasks.
• Study how miriad stores calibration tables and how we can extend these to store additional variation in frequency for complex antenna gains and leakages.
• It's unclear to what extent the wide band at high freq (eg 20GHz) is an analogue of the 20cm situation, vis-a-vis calibration (particularly phase winding across band).

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