Determination of the relative orientation between radio and dynamical reference frames using VLBI observations of spacecraft

Details Determination of the relative orientation between radio and dynamical reference frames using VLBI observations of spacecraft Determination of the relative orientation between radio and dynamical reference frames using VLBI observations of spacecraft

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995yera.conf...28s&link_type=abstract

The XXVIIth Young European Radio Astronomers Conference, ed. D.A. Green and W. Steffen, in association with Cambridge University

Astronomy and Astrophysics

Astronomy

Scientific paper

The experience of determination of the link between radio sources and dynamical reference frames is presented. To obtain this connection we used a series of very long baseline interferometry (VLBI) observations of the spacecraft Phobos-2 and angularly nearby quasars. Orbit determination of the spacecraft was carried out by numerical integration of relativistic equations of motion taking into account all major planet perturbations. The coordinates of perturbing planets were calculated by the DE200/LE200 ephemerides. The dynamical reference frame is determined by equator and equinox of these ephemerides. The resulting spacecraft orbit was fitted to the VLBI and tracing (range and Doppler frequency shift) data by means of weighted least squares procedure with the uncertainties at the level of a few kilometers. After precise orbit determination using VLBI measurements only we obtained three rotation angles between two systems. The radio and ephemeris dynamical frames were found to be coincident in all three axis to less than 100 milliarcseconds.

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