The One-Mile Telescope at the Mullard Radio Astronomy Observatory (MRAO), Cambridge, UK is an array of radio telescopes (two fixed and one moveable, fully steerable 60 ft-diameter (18 m) parabolic reflectors operating simultaneously at 1407 MHz and 408 MHz)[1] designed to perform aperture synthesis interferometry.

These surveys required intensive use of inverse Fourier transforms, and were made possible by development of a new generation of computers such as the Titan.

In 1971, Sir Martin Ryle described why, in the late 1950s, radio astronomers at MRAO decided on the construction of the new One Mile telescope: "Our object was twofold.

First we wanted to extend the range of our observations far back in time to the earliest days of the Universe, and this required a large increase in both sensitivity and resolution.

The construction of this telescope and development of the Earth-rotation aperture synthesis used when operating it contributed to Martin Ryle and Antony Hewish receiving the Nobel Prize for Physics in 1974.