The S2 VLBI Correlator: A Correlator for Space VLBI and Geodetic Signal Processing
B. R. Carlson, P. E. Dewdney, T. A. Burgess, R. V. Casorso, W. T. Petrachenko, W. H. Cannon
Abstract
We describe the design of a correlator system for ground and space-based VLBI. The correlator contains unique signal processing functions: flexible LO frequency switching for bandwidth synthesis; 1 ms dump intervals, multi-rate digital signal-processing techniques to allow correlation of signals at different sample rates; and a digital filter for very high resolution cross-power spectra. It also includes autocorrelation, tone extraction, pulsar gating, signal-statistics accumulation.
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