Documentation on uvjup

Task: uvjup
Purpose: Recompute various derived quantitues in a uv data-set
Categories: uv analysis

        uvjup recomputes various derived quantities in a uv data-set.
        This may be needed if the derived quantities are wrong for some
        reason, or if there is a need to change a coordinate system.

        NOTE: The recomputation relies on a number of parameters in the
        data-set, such as "time". It is assumed that this information is
        correct. Uv variables that are important are:
        For velocity: time and latitu,longitu (or telescop is these are
        missing).

Key: vis
        The name of the input uv data set. No default.

Key: select
        The normal uv selection commands. The default is to select everything.

Key: pltb
        Blackbody temperature of the disk to subtract off. Default is 0.

Key: out
        The name of the output uv data-set. There is no default name.

Key: options
        This gives extra processing options. Several options can be given,
        each separated by commas. They may be abbreviated to the minimum
        needed to avoid ambiguity. Possible options are:
           'jupaxis'     Set magnetic axis as the relevant one.
        The following options can be used to turn off calibration corrections.
        The default is to apply any calibration present.
           'nocal'       Do not apply the gains table.
           'nopass'      Do not apply bandpass corrections.
           'nopol'       Do not apply polarizatiopn corrections.

Key: pmotion
        Two Jupiter tracking files. The first gives the phase centre
        (as a function of time) of Jupiter. The second
        gives the phase centre of the observation (as a function of time).
        The latter defaults to the position given in the dataset.
        A phase shift is applied to the data to correct for differences
        between these two.