A&A Supplement Series, Vol. 126, December I 1997, 379-383

Received October 23, 1996; accepted March 28, 1997

Calculating quantization correction formulae for digital correlators with digital fringe rotation

P.P. Roberts

CSIRO, Australia Telescope National Facility, PO Box 76, Epping, 2121, Australia

Abstract:

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

• 1. Introduction
• 2. Calculating the conversion function
• 3. Signal-to-noise performance
• 4. Two-level correlator
• 5. Four-level correlator
• 6. Three-level correlator
• 7. Conclusion
• References