The Calibration Pipeline reduces delays measurements in quasi-real time,
in an automatic way. The system
is halted until the results are available.
Role(s)/Actor(s):
Primary: Calibration Pipeline
Secondary:
Priority: Major
Performance: Seconds
Frequency: Hours
Preconditions:
-
The processing is initiated by the Calibration Pipeline (see Use Case
ProcessCalibrations).
-
One or several observations of a strong point-like source have been obtained,
belonging to one or several contiguous scans.
-
Input:
-
Visibilities for all spectral channels, averaged over the total integration
time.
-
Last measured delays for the antenna positions currently used.
-
Parameters for frequency smoothing (method and associated parameters).
Basic Course:
-
Check data consistency.
Exception course: If data not consistent: stop processing and
return a specific error code.
-
Optionaly: smooth the data along the frequency axis.
Exception course: If failure: stop processing and return a specific
error code.
-
Derive antenna-based delays.
Exception course: If failure: stop processing and return a specific
error code.
-
Verify that result is sensible and set quality code.
Exception course: If failure: stop processing and return a specific
error code.
Alternate Course:
Postconditions:
-
Outputs:
-
For each antenna: delay measurement, associated uncertainty, and quality
code
-
Error code
-
Results are fed back to the Calibration Pipeline.
Issues to be Determined or Resolved:
Notes:
-
The processing of the delay measurements requires the spectral visibilities.
-
The processing of the delay measurements and that of the bandpass measurements
are coupled.
Owner: Frederic Gueth