UV_TRACK

    UV_TRACK  simulates  the  uv coverage of an observation specified by the
    source, observatory, and hour angle range. The output is a uv table that
    can be used as input for tasks such as UV_FMODEL. Caution: this uv table
    is not standard, as it includes two addition columns  (#11  with  eleva-
    tion, #12 with integration time).

    The  weight  column  (#10) is filled with as realistic as possible esti-
    mates of the actual weights (derived from Trec, Tau, elevation).

    The visibilities columns (#8 and #9) are filled with a point source (am-
    plitude  =  1,  phase = 0). Random phase noise can be added, to simulate
    atmospheric phase noise.

    UV_TRACK family of tasks (in order of increasing complexity):

        - UV_TRACK: uv coverage + random phase noise
        - UV_TRACK_PHASE: phase noise from atmospheric screen + observations
          of calibrator +  WVR correction
        - UV_OBSERVE: also includes amplitude noise
        - UV_OBSERVE_NEW: also includes anomalous refraction