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: http://www.arcetri.astro.it/science/Radio/instr/gwe/gwe.html
Дата изменения: Wed Sep 20 18:58:59 2000 Дата индексирования: Sat Dec 22 09:38:27 2007 Кодировка: Поисковые слова: m 5 |
Doppler tracking is a technique to accurately monitor the
distance to a interplanetary space probe. A radio signal is sent to the
probe, and retransmitted back to the same or another antenna on ground.
The transmitted and received signals are compared in phase, using an
atomic clock to propagate the phase during the long (several thousands
of seconds) round-trip travel time of the radio signal.
The very accurate (typically some hundred microns) measurement can be used to investigate:
Experiments to try to detect gravitational waves have been carried in 1992 and 1993 using the S/C Ulysses and several VLBI radiotelescopes, including Medicina, Noto and Kashima (Japan). Data analysis is in progress.