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MSETUP CALIBRATION
[MRTCAL\]MSETUP CALIBRATION Keyword Switch
[MRTCAL\]MSETUP CALIBRATION BAD YES|NO
Choose if the bad time dumps in the BackendXXX tables should be cali-
brated (in addition to the good ones). A bad time dump has a null
ISWITCH value, and its associated data (e.g. MJD, INTEGTIM) are not ex-
pected to be correct. If YES is requested, you will likely be exposed to
problems (e.g. if MJD column has incorrect values, searches in this col-
umn may fail without advise). Default is NO.
[MRTCAL\]MSETUP CALIBRATION BANDWIDTH Value
Setup the desired calibration bandwidth in MHz. The nearest value that
allows the division of the good spectra channels of each chunkset in
equal virtual chunk sizes will be used. Exceptions are:
- if value is 0, use the native hardware chunk size (no subdivision),
- if value is larger than the native hardware chunk size, the latter
is used instead (same as 0),
- if value is lower than the channel spacing, the latter is used in-
stead (all channels calibrated individually, use with caution).
Default is 20 MHz.
[MRTCAL\]MSETUP CALIBRATION CHOPPER STRICT|TOLERANT
Setup the chopper calibration engine. By default (strict mode), any er-
ror occuring during this process (e.g. cold load greater than hot load)
blanks the resulting data at the chunk level (i.e. the surrounding
chunks are calibrated if they have no problem). In tolerant mode, the
engine goes to the end of process, even if this implies non physical re-
sults (e.g. negative Trec). This second mode is dangerous and should be
used for testing purposes only.
In both modes, a FLAG array is added to the calibration products (see
HELP MSET OUTPUT CALIBRATION). It is 0 where no problem occured, and 1
otherwise.
[MRTCAL\]MSETUP CALIBRATION FEEDBACK PIXEL|SET|ELEMENT
Tune the granurality of the calibration results (Tsys, Tcal, Trec, ...).
The median value per pixel, per chunkset, or per chunk element will be
printed in the PIXEL, SET, or ELEMENT mode, respectively. One value per
chunk element may result in very long lists when using virtual chunk
sizes (see MSETUP CALIBRATION BANDWIDTH). Default is SET.
[MRTCAL\]MSETUP CALIBRATION INTERVAL ErrLimit [WarnLimit]
Setup the time limits (in minutes) used when searching automatically for
a calibration scan to be associated to a science scan. Beyond ErrLimit,
an error is raised if no calibration scan is found. Beyond WarnLimit,
only a warning is displayed. Automatic search is used by the commands
PIPELINE and CALIBRATE without the option /WITH. The calibration scan
always can be forced with CALIBRATE /WITH. Default ErrLimit is 30 min-
utes, and WarnLimit defaults to 2/3 of ErrLimit.
[MRTCAL\]MSETUP CALIBRATION MATCH Value
Define the position matching tolerance when checking the subscan posi-
tion(s) on sky. This tolerance is used 1) when checking that a 'track'
subscan effectively provides dumps at the same position, and 2) when
grouping the subscans per ON or OFF positions, and checking that each
group effectively provides the same position. Default is 4 centi-arcsec-
onds.
[MRTCAL\]MSETUP CALIBRATION MJDINTER YES|NO
Choose if Mrtcal should intersect the DATE-OBS and DATE-END (on-track
range) of the subscans with the MJD columns in the tables Antenna Slow,
Antenna Fast, and Backend Data. It may happen that one of these columns
are too short and the data dumps can not be calibrated. Setting YES
means that the associated dumps in this missing range won't be consid-
ered on-track anymore, and won't be calibrated. Default is NO.
[MRTCAL\]MSETUP CALIBRATION OFF NEAREST|LINEAR
Define how to select the OFF subscan matching the current ON subscan da-
ta (OTF PSW only). In NEAREST mode, the OFF subscan nearest in time will
be used. In LINEAR mode, the algorithm will linearly interpolate between
the two nearest OFF spectra. Default is LINEAR.
[MRTCAL\]MSETUP CALIBRATION PRODUCTS LINEAR|NEAREST|SPLINE
One set of calibration products Trec, Tcal, Tsys, precipitable water va-
por, and zenithal opacity is computed per chunk, at the middle of the
chunk (chunk bandwidth is ruled by MSET CALIB BANDWIDTH). In NEAREST
mode, the intermediate values on the frequency axis use the nearest com-
puted values (flat value per chunk/bandwidth, possible discontinuities).
In LINEAR mode, the intermediate values are interpolated between two
middle of chunks (possible discontinuity of the derivatives). In SPLINE
mode, the intermediate values are cubic spline interpolated between two
middle of chunks (ensuring continuity of the first and second deriva-
tives). Default is LINEAR.
[MRTCAL\]MSETUP CALIBRATION SCAN NEAREST|LINEAR
Define how to select the calibration scan used calibrate science data.
In NEAREST mode, the scan nearest in time will be used. In LINEAR mode,
the algorithm will linearly interpolate calibration parameters between
the two nearest calibration scans. Default is NEAREST.
[MRTCAL\]MSETUP CALIBRATION WATER SET
[MRTCAL\]MSETUP CALIBRATION WATER ELEMENT
[MRTCAL\]MSETUP CALIBRATION WATER FIXED Value
Define if the precipitable water vapour amount should be minimized or
not:
- SET means one single value for the whole bandwidth,
- ELEMENT means one independent value per calibration bandwidth,
- FIXED Value will force the pwv amount to the given value without
minimization.
Default is ELEMENT.
Gildas manager
2023-06-01