A&A Supplement Series, Vol. 126, December I 1997, 379-383
Received October 23, 1996; accepted March 28, 1997
P.P. RobertsCSIRO, Australia Telescope National Facility, PO Box 76, Epping, 2121, Australia
A method for calculating the conversion relationship between measured digital correlation and true analogue correlation, for digital correlators incorporating digital fringe rotation, is presented. Explicit expressions for the efficiency of correlators of this type are derived which can be used to optimise correlator system parameters. Results are presented for four correlation schemes in common use.
keywords: instrumentation: spectrographs -- instrumentation: interferometers