An overview of using DiFX for Geodesy. This includes verification against the Mark4 correlator, difx2mark4, integrations with HOPS (fourfit), unit testing to ensure continuing accuracy and consistency, and preparation for 2010.
Test for antennas in scan by checking if they have a model
Crashes? investigate behaviour when antenna should have correlated but no visibilities are found
proper calculation of fourfit reference time consistent with mark4 code
Get EOPs from difx input rather than vex file
Write $SOURCE block from difx input rather than vex file (in case .v2d file changes the source name)
Handle n-order clock polynomials properly
allow different order delay polynomials (or give an appropriate error if fourfit can only handle 6 terms)
update -h documentation
explicitly disallow specifying a single scan to extract for now
Handle data outside individual antenna slew times. At the visibilities are discarded but root file doesn't reflect this.
Support multiple phase centres/different pulsar bins
Allow a single scan from a job to be extracted
Spectral averaging on conversion
Time averaging on conversion
HOPS is still tied to some extent to the Mark4 correlator. Separating the post-processing tools (including but not limited to fourfit) and making them installable and testable with autotools is a work in progress.
Get into a vendor branch
Installation guide on
DiFX wiki
Expand multitone mode in fourfit to allow flexible averaging over time, and application of resultant phases to data.
Add ionospheric estimation in fourfit.
Add fourfit code to allow coherent combination of multiple polarization products.
