ONOFF
Keywords: pako

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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

- ONOFF /DEFAULTS
- ONOFF /NSUBSCANS
- ONOFF /REFERENCE
- ONOFF /SWWOBBLER
- ONOFF /SYMMETRIC
- ONOFF /SYSTEM
- ONOFF /TSUBSCAN
- ONOFF EXAMPLES