Up: List of Associated Tasks
UV_OBSERVE 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). Amplitude calibration errors (offset + drifts)
can be included. Random phase noise can be added, to simulate atmospher-
ic phase noise.
If DO_SCREEN = YES, a phase screen is used to simulate phase noise: this
file contains a statistically correct spatial distribution of the phase
perturbation induced by the atmopshere. This screen moves above the ar-
ray at the wind velocity. The correct phase value is computed each an-
tenna at each time dump.
If DO_CALIB = YES, the observations of a calibrator are simulated, as-
suming a loop calibrator-source-calibrator-source. The corresponding uv
table is created.
If DO_RADIOM = YES, a phase correction based on WVR measurements is sim-
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