Requirements:

• DiFX-2.4 or above
• GSL
• GSLCBLAS
• automake autoconf libtool

Description:

Limitations:

1. 2-bits sampling
2. Only generate single-thread multi-channel VDIF
3. Default SEFD for 3 antennas
4. VDIF packet of all antennas need to repsent the same time length

Installation:

• $ libtoolize --force
• $ aclocal -I m4
• $ autoheader
• $ automake --force-missing --add-missing
• $ autoconf
• $ ./configure --prefix=$HOME
• $ make
• $ make install

Usage:

1. source DiFX setup.bash file
2. source HOPS hops.bash file
3. 'datasim --help' shows a list of possible options
4. generate v2d and VEX file: './genv2dvex.sh exp_dir input'
5. in the directory of the generated v2d and VEX file, create simulated .vdif data: 'datasim -f 100 -s 1000,2000,3000 -d 12345 datasim_7004.input' where -f is the source flux density, -s is a list of antenna SEFDs, -d is the random number seed