- Fast Fourier Transform Telescope
"Fast Fourier Transform Telescope" is
Max Tegmark's name for an all- digitalsynthetic-aperture telescope.
Hippolyte Fizeaurealized that the lenses and mirrors in a telescopeperform a physical approximation of a Fourier transform.Fact|date=October 2008 He noted that by using an array of small instruments it would be possible to measure the diameter of a star with the same precision as a single telescope which was as large as the whole array — a technique which later became known as astronomical interferometry. See History of astronomical interferometry.
In 2008, Tegmark proposed that the lenses and mirrors could be dispensed with altogether when computers become fast enough to perform all the necessary transforms. His concept is an all-digital telescope with an antenna consisting of a rectangular grid. Building
radio telescopes this way should become feasible within a few years if Moore's lawcontinues to hold. Eventually optical telescopes could also be built this way.Fact|date=October 2008 This technique is already being used in radarapplications.
Interferometric synthetic aperture radar
Inverse synthetic aperture radar
Synthetic aperture radar
* [http://arxiv.org/abs/0805.4414 The Fast Fourier Transform Telescope]
* [http://space.newscientist.com/article/mg19926752.100-ultimate-telescope-could-take-astronomers-back-in-time.html New Scientist article, issue 2675, 24 September 2008]
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