another #metrology #paper #PDF about the #Tellurometer, explaining how it works using signals of 10 MHz, 9.99MHz, 9.9MHz, and 9MHz, modulated onto a 3GHz carrier wave. It explains the whole algorithm.
on 02026-07-27#PDF #paper by Sturman and Wright on “the #history of #Tellurometer”, a surveying instrument that could measure distances to 1ppm with microwaves. The figures are missing from this version. “The Tellurometer is basically a time measuring device and this is achieved by measuring the phase of a frequency which has been modulated onto the carrier.”
on 02026-07-27