next up previous contents index external
Next: Flux density calibration Up: Calibration Strategy Previous: Self-calibration

Position calibration

       

The phase referencing that is done during external calibration refers the absolute position scale of the images to the mean position scale defined by the adopted positions of the external phase calibrators, if the antenna co-ordinates are well determined. No further positional calibration is required for routine (non-astrometric) synthesis imaging. Note however that self-calibration fundamentally has no absolute phase reference and therefore produces images whose position scale is whatever was specified in the input model.



abridle@nrao.edu
Thu Jul 11 16:26:53 EDT 1996