A high-speed digital correlator for radio astronomy |
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| Authors: | 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. |
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| Affiliation: | Owens Valley Radio Obs., California Inst. of Technol., Big Pine, CA; |
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| 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 |
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