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ONOFF
ONOFF xOffset yOffset
Specify on-off measurement, a.k.a. "position switching".
Real :: xOffset ! x-offset of "on-source" position
Real :: yOffset ! y-offset of "on-source" position
Character :: sourceName ! name of "on-source" position
NOTE: if SWWOBBLER is the selected switching mode, the special option
/SWWOBBLER YES (TRUE) is implied even without specifying it, and the
on-off parameters appropriate for on-off Wobbler switching are set.
If SWWOBBLER and ONOFF are combined in the standard way, we
effectively take data at 3 positions:
1. the source position
2. the source position + throw (offset in the "true-angle" horizontal syste
3. the source position - throw (offset in the "true-angle" horizontal syste
with throw = ABS(wOffset2-wOffset1).
Data from 1. are treated as source signal, data from 2 and 3 as
off-source reference signal. Note that in the astronomical
coordinates, positions 2 and 3 will rotate around the source position
(1). Therefore one must normally be sure that the extent of the source
is less than throw-beamWidth (/2).
/REFERENCE xOffsetR yOffsetR [systemNameRef]
or
/REFERENCE NO ! no reference
position of off-source reference subscans
Real :: xOffsetR ! x-offset
Real :: yOffsetR ! y-offset
Character :: systemNameRef ! name of system
! see /SYSTEM for choices
NOTE: with the usage /REFERENCE xOffsetR yOffsetR, both parameters are requi
but you can replace either parameter with * to leave it unchanged.
/SYSTEM systemName
Name of system for offsets.
Character :: systemName ! name of system, one of:
! PROJECTION
! TRUEHORIZON
! NASMYTH
<<TBD: ! DESCRIPTIVE>>
<<TBD: ! BASIS>>
<<TBD: ! EQUATORIAL>>
<<TBD: ! HADECL>>
<<TBD: ! HORIZONTAL>>
PROJECTION for now means only the standard simple "radio" projection
offsets in the chosen coordinate system. This is normally the
astronomical system of offsets in which point-by-point (TRACK, ONOFF)
or on-the-fly (OTFMAP) maps are made.
TRUEHORIZON means the horizontal system with a factor 1/cos(elevation)
applied to the azimuth offset.
NASMYTH are special offsets to point an off-center pixel of a
focal-plane array receiver (bolometer, HERA) to the commanded
astronomical position, e.g., to use an off-center pixel for pointing,
focus, ONOFF.
IMPORTANT NOTE: projection, trueHorizon
If the observing mode (LISSAJOUS, ONOFF, OTFMAP, ...)
is in /SYSTEM projection,
OFFSETS ... /SYSTEM projection is ignored (not used).
If the observing mode (LISSAJOUS, ONOFF, OTFMAP, ...)
is in /SYSTEM trueHorizon,
OFFSETS ... /SYSTEM trueHorizon is ignored (not used).
IMPORTANT NOTE: OFFSETS /SYSTEM Nasmyth
If OFFSETS xOffset yOffset /SYSTEM Nasmyth are specified in pako,
the values xOffset yOffset are used during the observations.
(this inludes the case that they are explicitly set to 0.0).
It is up to the observer to make sure that they are "correct".
(in pakoDisplay /SYS Nasmyth will be highlighted as yellow alert.)
If OFFSETS xOffset yOffset /SYSTEM Nasmyth are not specified
(cleared), for the MAMBO bolometer, Nasmyth offsets are used
automatically according to the selected bolometer channel (pixel).
Subsections
Gildas manager
2023-06-01