The Wavefront Clock Technique Applied to Current VLBI Systems

Details The Wavefront Clock Technique Applied to Current VLBI Systems The Wavefront Clock Technique Applied to Current VLBI Systems

Feb 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996pasj...48..137k&link_type=abstract

Publications of the Astronomical Society of Japan, v.48, p.137-146.

Astronomy and Astrophysics

Astronomy

1

Instrumentation: Interferometers, Techniques: Interferometric, Time

Scientific paper

A prototype wavefront clock system has been developed for application to current VLBI systems. The reference clock for both the front-end and back-end of a VLBI system is controlled at the observing site according to a calculated a priori delay rate. By using this system, fringe stopping is simultaneously performed on all received frequencies and both the upper side band (USB) and the lower side band (LSB) of a frequency-converter signal. Also, it can be used to reduce the large fringe rate (Doppler frequency) inherent in space VLBI, especially when used with an FX-type correlation proces sor. This wavefront clock method will be beneficial to users of conventional VLBI systems and will not require any modification. The reference point for the Doppler compensation can be taken at an ideal point , like the center of the Earth. Moreover, it is possible to use it as a pseudo-fringe simulator for checking the correlation processor.

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