Calculating dispersive path delay due to the atmosphere

I've posted a simple command-line program to compute the dispersive path delay due to the atmosphere using ATM (more precisely my re-packaging AATM). The program is available at:

http://www.mrao.cam.ac.uk/~bn204/alma/aatm-dispersive.html

I had not appreciated that even at 330GHz, the dispersive wet delay is about 10% of the non-dispersive wet delay.

Out-Of-Focus holography with mm-wave cameras

Recently, we (meaning the groups at NRAO, at University of
Pennsylvania and myself) have made progress on enabling the OOF
holography technique (see http://www.mrao.cam.ac.uk/~bn204/oof/) on
large-format radio wavelength cameras, in particular the MUSTANG array
at the GBT.

This work is being documented on the following wiki:

http://wiki.gb.nrao.edu/bin/view/PTCS/OOFHolography

The oof software is available for download at:

http://www.mrao.cam.ac.uk/~bn204/oof/software.html

Finally, as an illustration, below is a map of the GBT surface
re-created from out-of-focus MUSTANG images. Although this particular
observation took of the order of 15 minutes, it is likely we will be
able to reduce this to the order of a couple of minutes, allowing
effective and rapid correction of all gravitation and thermal effects
on the telescope.

My talk at the Oxford Algorithms Workshop

The talk I gave at the Oxford Algorithms workshop is available at:

http://www.mrao.cam.ac.uk/~bn204/publications/2008/AlgorithmsOxford09.pdf

Almost all of the talks I've given recently are available too:

http://www.mrao.cam.ac.uk/~bn204/publications/publicationlist.html

Algorithms meeting in Oxford

For a part of this week, I'm at the Oxford Algorithms workshop:

http://astrowiki.physics.ox.ac.uk/cgi-bin/twiki/view/Algorithms2008/WebHome