Title :
A high-speed digital correlator for radio astronomy
Author :
Padin, S. ; Clark, T.S. ; Ewing, M.S. ; Finch, R.P. ; Lawrence, R.P. ; Navarro, J. ; Scott, S.L. ; Scoville, N.Z. ; Seelinger, C. ; Seling, T.V.
Author_Institution :
Owens Valley Radio Obs., California Inst. of Technol., Big Pine, CA, USA
fDate :
8/1/1993 12:00:00 AM
Abstract :
Design details for a high-speed digital cross correlator for the Owens Valley Millimeter Array are presented. The correlator uses ECL gate arrays operating at a 256-MHz clock rate to compute the real cross-correlation function for up to four independent frequency bands with bandwidths in the range of 2-128 MHz. For each baseline in the array the correlator provides 512 lags, giving a spectral resolution of 2 MHz at the maximum bandwidth. Two-bit digitization is used, and this results in a sensitivity of 0.88 relative to a perfect analog correlator
Keywords :
correlators; emitter-coupled logic; logic arrays; radioastronomical techniques; signal processing equipment; 2 to 128 MHz; 256 MHz; ECL gate arrays; Owens Valley Millimeter Array; clock rate; high-speed digital correlator; radio astronomy; real cross-correlation function; two-bit digitisation; Bandwidth; Clocks; Correlators; Fourier transforms; Frequency; Quantization; Radio astronomy; Radio interferometry; Senior members; Telescopes;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
