Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...231..581p&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 231, no. 2, May 1990, p. 581-587.
Astronomy and Astrophysics
Astrophysics
3
Astrometry, Pulsars, Very Long Base Interferometry, Astronomical Coordinates, Celestial Mechanics, Cross Correlation, Signal To Noise Ratios
Scientific paper
A technique for the cross correlation of millisecond-pulsar VLBI data based on dedispersion over 2 MHz and on fast gating of the pulsating signal is applied to three minutes of data from 1.66 GHz VLBI observations of the millisecond pulsar PSR 1937 + 214. It is shown that the signal-to-noise ratio (SNR) is significantly enhanced. It is also shown that it is possible to measure the arrival time of the pulse with an accuracy of a few microseconds with a few minutes of data by moving a narrow correlation window to maximize the SNR. An implementation of this technique (hardware or supercomputer) opens up the prospective of determining milliarcsecond VLBI positions of millisecond pulsars by phase reference VLBI observations.
Fayard T.
Lestrade Jean-Francois
Petit Gregory
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