- Fast Fourier Transform Telescope
**"Fast Fourier Transform Telescope"**isMax Tegmark 's name for an all-digital synthetic-aperturetelescope .In 1868,

Hippolyte Fizeau realized that the lenses and mirrors in atelescope perform a physical approximation of aFourier 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 asastronomical interferometry . SeeHistory 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 telescope s this way should become feasible within a few years ifMoore's law continues to hold. Eventuallyoptical telescope s could also be built this way.Fact|date=October 2008 This technique is already being used inradar applications.**ee also***

Aperture synthesis

*Interferometric synthetic aperture radar

*Inverse synthetic aperture radar

*Synthetic aperture radar **References*** [

*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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