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Telescope information

In a UV table, there can be a telescope pair column (code code_uvt_tele, see value in Appendix C). It describes the pair of telescopes used for the given baseline.

This column is directly linked to the telescope section possibly available in any GDF file. The pair value is an integer equal to $magic \times itele(iant) + itele(jant)$, where $magic$ is a factor available in the telescope section, and $itele(xant)$ is the telescope number from this section (corresponding to antenna $xant$ for the baseline $(iant,jant)$). This allows to identify each telescope (in particular its diameter). If there is only one telescope for the given baseline, only $pair = itele(iant) = itele(jant)$ is saved. Decoding is then simple and generic:

  if (pair.gt.magic) then
    itele(iant) = pair/magic
    itele(jant) = pair-itele(iant)*magic
  else
    itele(iant) = pair
    itele(jant) = pair
  endif
The respective diameter for each antenna is then h%gil%teles(itele(xant))%diam.



Gildas manager 2023-06-01