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difx:here [2019/11/13 15:27]
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-====== Major User-Facing Developments in DiFX since 2.0 Release ====== 
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-===== DiFX 2.6.1 (Released Aug 28, 2019) ===== 
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-  * mpifxcorr can extract pulse cals with tone spacing smaller than 1 MHz 
-  * difx2fits: populate antenna diameters and mount types for antennas known to the difxio antenna database 
-  * difx2mark4: support multiple bandwidths in one pass 
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-===== DiFX 2.5.3 (released March 28, 2019) ===== 
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-===== DiFX 2.5.2 (released Mar 6, 2018) ===== 
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-===== DiFX 2.5.1 (released Sep 25, 2017) ===== 
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-  * Initial support for correlating Mark6. ​ This is still much a work in progress. 
-  * Multiple datastreams per antenna supported via vex2difx 
-  * New delay model program: difxcalc11. ​ No longer requires calcserver. 
-  * Support for more than 6 days of EOP values. 
-  * "Union mode" in difx2fits allows merging of correlation output that uses different setups. ​ Some restrictions apply. ​ Designed for GMVA and RadioAstron use. 
-  * Improved VDIF support: wider range of bits/​threads,​ support for multi-channel,​ multi-thread VDIF, support for complex multi-thread VDIF 
-  * Support for new VDIF Extended Data Version 4 which is useful for multiplexed VDIF data.  See: http://​vlbi.org/​vdif/​docs/​edv4description.pdf 
-  * New package: polconvert. ​ Used to post-correlation convert from linear to circular polariations 
-  * New package: autozoom. ​ Helps a user develop .v2d file content when setting up complicated zoom band configurations. 
-  * New package: datasim: generate baseband data suitable for simulated correlation 
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-===== DiFX 2.4 (released Mar 31, 2015) ===== 
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-  * Add network support (TCP, UDP and Raw Ethernet) for multi-threaded VDIF. 
-  * Support for X/Y polarization correlation. ​ Many fundamental issues with linear polarization remain though: 
-    - This does not support in a meaningful way Linear*Circular correlations 
-    - There is a terminology gap in many bits of software and file formats that confuses X/Y with H/V polarization bases 
-    - The intent of this support is for short baselines (VLITE) 
-  * Support for "​d2k"​ mode in Mark5B format (swapped sign and mag bits). 
-  * m5bstate: support complex sampled data 
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-===== DiFX 2.3 (released Jan 18, 2014) ===== 
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-  * mpifxcorr: LO offsets are now corrected in the time domain when fringe rotation is also done in the time domain (the usual mode), allowing considerably larger LO offsets without decorrelation 
-  * mpifxcorr: Working polarization dependent delay and phase offsets 
-  * mpifxcorr: Complex Double sideband (RDBE/​Xcube) sampling support 
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-===== DiFX 2.2 (released Jun 12, 2013) ===== 
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-  * Fix bug preventing subintegrations longer than 1 second. Now 2 seconds is allowed (this limit comes from signed integer number of nanoseconds). 
-  * Faster VDIF corner turning through customized bit shifting functions 
-  * mpifxcorr can now be built without Intel Integrated Performance Primitives, though resulting in a slower correlator. 
-  * vdifio: several new VDIF manipulation and processing utilities added: vmux, vsum, vdifd, vdifspec, vdiffold, vdifbstate. ​ Also bug fixes in multi2singlethreadVDIF to cope with large amounts of packet loss. 
-  * difx2fits allows more phase cal tones 
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-===== DiFX 2.1.1 (released Jun 07, 2012) ===== 
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-  * mpifxcorr: fix a scaling issue with autocorrelations of LBA-format data in mpifxcorr. ​ Does not affect Mark4, VLBA, Mark5B or any other format. 
-  * mpifxcorr: Mixed 1 and 2 bit data are handled more cleanly 
-  * mpifxcorr: Correctly scale cross-correlation amplitudes for pulsar binning when using Tsys>2 (accounts for varying # samples per bin c.f. nominal) 
-  * mpifxcorr: Support for non power-of-2 FFT lengths 
-  * mpifxcorr: Multithread VDIF support enabled for the data sources FILE and MODULE, including stripping of non-VDIF packets 
-  * mpifxcorr/​vex2difx:​ new FAKE datastream type for performance testing 
-  * mk5daemon: VSIS interface added 
-  * difx2fits: write new RAOBS, DECOBS columns in source table 
-  * Espresso, a lightweight system for managing disk-based correlation,​ has been added to the DiFX repository. ​ 
-  * vex2difx: Option to correlate only one polarization has been added. 
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-===== DiFX 2.0.1 (released Jun 24, 2011) ===== 
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-  *  mpifxcorr: Switched power detection 
-  *  mpifxcorr: Early multi-thread VDIF format support 
-  *  mpifxcorr: Initial complex sampling support