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Reference Position (Offset)
Up to two reference positions can be specified if this option has been selected in the panel above. These can be used to define offsets for On The Fly observing or for system temperature measurement. The parameters are:
- Reference Coordinates:
- Coords Type: Choose between absolute or relative (to the Field Source) coordinates. It is not absolutely clear if absolute coordinates are supported - it's therefore safest to use relative. Only FK5 J2000 and horizon offsets are currently supported.
- Absolute offset inputs:
- Relative offset inputs:
- System:
- Offset(Longitude):
- Offset(Latitude):
- Integration Time: Time spent integrating per visit.
- Cycle Time:
- Sub Scan Duration: This must be an integer multiple of both the integration duration and 48 ms. If an approximation is entered (the real value normally has lots of decimal places), a button is available to adjust this to the nearest legal value.
The ALMA OT Team, 2016 Aug 23