ALMA Holography Monitor and Control Software Requirements

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Last Update: JeffMangum - 09 Nov 2006

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DarrelEmerson and JeffMangum developed a list of hardware and software requirements for the production holography integration which was presented at the June 19-20, 2006 AIV Review in Santiago. The table below is a quantification of those requirements listing also the current status of their development:

Requirement	Details	Status	Comment	Last Update
Can OTF data be recorded correctly, with antenna pointing data	Requires measurement for confirmation	done	Verified by Robert Lucas.	11 November 2006
Can we perform OTF holography data analysis: data gridding, FFT, near-field correction etc.?	Requires measurement for confirmation	done		10 November 2006
Data analysis: can we display amplitude and phase as a function of time, with the antenna stationary? This is needed for the receiver stability tests		done	Implemented and tested.	5 November 2006
Is the entire system sufficiently robust, capable of operating at least for hours without phase locks coming out of lock, or computer reboots? This is the ultimate holographic test for system stability.	Requires measurement for confirmation	not done		11 November 2006
Receiver & backend: does it produce adequate amplitude and phase stability?	Requires measurement for confirmation	partially done	Appears to be ok, but further checks need to be made.	11 November 2006
The holography feed illumination should be correct	Requires measurement for confirmation	done	Checked 2006/11/09	9 November 2006
The holography receiver must be mounted and in focus	Requires measurement for confirmation	done	Focus checked 2006/11/10. Set to -4mm.	11 November 2006
The received signal should be available end-to-end, from transmitter to displayable data on disk	Requires low-level data acquisition software	done	Implemented and tested.	5 November 2006
The receiver should be on the correct frequency	Requires measurement for confirmation	done		4 November 2006
The telescope should be steerable	(a) It must be possible to point the antenna into a chosen Az & El direction (b) It should be capable of performing cross-scans and OTF raster scans (c) It should be recording time-stamped Az-El coordinates during an OTF scan	partially done	Point (a) is done. Point (b) is not done. Point (c) is done.	11 November 2006
The transmitter pointing should be adjustable with sufficient precision (NB we probably won't have the positioner that will be used at the OSF)	Requires measurement for confirmation	done	Transmitter has been realigned by Jack Meadows. Spot-on.	11 November 2006
The transmitter should be illuminating the antenna correctly	Requires measurement for confirmation	done	Transmitter has been realigned by Jack Meadows. Spot-on.	11 November 2006
The transmitter should be on the right frequency	Requires measurement for confirmation	done	Checked several times a day.	11 November 2006
The transmitter should be producing adequate power	Requires measurement for confirmation	done	Looks ok.	11 November 2006
There should be adequate transmitter-receiver sensitivity	Requires measurement for confirmation	done	Appears to be ok, but further checks need to be made.	11 November 2006

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