Very Long Baseline Interferometry: Dependencies on Frequency Stability
Very Long Baseline Interferometry (VLBI) is a differential technique observing radiation of compact extra-galactic radio sources with pairs of radio telescopes. For these observations, the frequency standards at the telescopes need to have very high stability. In this article we discuss why this is,...
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| Veröffentlicht in: | Space science reviews 2018-04, Vol.214 (3), p.1-15, Article 66 |
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| creator | Nothnagel, Axel Nilsson, Tobias Schuh, Harald |
| description | Very Long Baseline Interferometry (VLBI) is a differential technique observing radiation of compact extra-galactic radio sources with pairs of radio telescopes. For these observations, the frequency standards at the telescopes need to have very high stability. In this article we discuss why this is, and we investigate exactly how precise the frequency standards need to be. Four areas where good clock performance is needed are considered: coherence, geodetic parameter estimation, correlator synchronization, and UT1 determination. We show that in order to ensure the highest accuracy of VLBI, stability similar to that of a hydrogen maser is needed for time-scales up to a few hours. In the article, we are considering both traditional VLBI where extra-galactic radio sources are observed, as well as observation of man-made artificial radio sources emitted by satellites or spacecrafts. |
| doi_str_mv | 10.1007/s11214-018-0498-1 |
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| subjects | Aerospace Technology and Astronautics Astrophysics and Astroparticles Frequency stability Frequency standards High Performance Clocks with Special Emphasis on Geodesy and Geophysics and Applications to Other Bodies of the Solar System Hydrogen Hydrogen masers Interferometry Parameter estimation Physics Physics and Astronomy Planetology Radiation Radio telescopes Space Exploration and Astronautics Space Sciences (including Extraterrestrial Physics Synchronism Telescopes Very long base interferometry |
| title | Very Long Baseline Interferometry: Dependencies on Frequency Stability |
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