Despite its age and limited resources, AIPS remains used and under active development. CASA has gone on to be the main data-reduction package for the upgraded VLA (EVLA) and ALMA, but AIPS remains able, to a large degree, to process data from these state-of-the-art instruments. Single-dish support was also added in the 1980s, with particular application to NRAO's 12-m radio telescope and the 91-m transit telescope.ĪIPS has now been in use for nearly 40 years and has even outlived its supposed replacement AIPS++, which was eventually rebranded as CASA. The ability to calibrate VLBI data (including space VLBI) was added in the 1990s, primarily to support operations with the VLBA, but in the process becoming the main data-reduction package for the EVN and combined VLBA/EVN observations (Global VLBI). Initial usage was focused on the VLA, but it has gone on to be used to reduce data from practically all radio interferometers, including MERLIN and the GMRT and, to a lesser extent, the WSRT and ATCA. Over the years, the capabilities of AIPS have greatly expanded. Since 2018, a pre-compiled version is no longer available for Solaris and users must now build AIPS from source. Pre-compiled versions are today available for users of Linux and Mac OS. The very first AIPS installation was on a MODCOMP computer, but the package's portability has led to it being installed on many different systems. Originally written in FORTRAN 66, AIPS has used FORTRAN 77 since 1989. Although partially replaced by CASA, it continues to evolve and remains in use.ĭevelopment of AIPS started at NRAO in 1978, two years before the VLA became fully operational. Limited single-dish capability is also featured. Developed predominantly for use with the then under-construction VLA, the generality inherent in its design allowed it to become the standard data-reduction package for most radio interferometers, including VLBI. The Astronomical Image Processing System (AIPS) is a software package to support the reduction and analysis of data taken with radio telescopes.
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