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imager.calcuvw - Function

2.5.1 Calculates (u, v, w) coordinates for the ms.


Description

This calculates (u, v, w) positions for the visibilities using the antenna and feed positions and offsets, the time, and the phase tracking center(s).

Arguments





Inputs

fields

Field IDs (numbered relative to 0) to operate on. Blank = all.

allowed:

intArray

Default:

-1

refcode

Reference frame to use for the generated (u, v, w)s. WARNING: clean and the im tool ignore the reference frame claimed by the UVW column (it is often mislabelled as ITRF when it is really J2000) and instead assume the (u, v, w)s are in the same frame as the phase tracking center. calcuvw does not yet force the UVW column and field centers to use the same reference frame! Blank = use the phase tracking frame of vis.

allowed:

string

Default:

reuse

Start from the UVWs in vis (True) or calculate them from the antenna positions?

allowed:

bool

Default:

true

Returns
bool

Example

 
 
     im.open("3C273XC1.MS")  
     im.calcuvw()  
     im.done()  
 

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