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A 6-12 GHz Analogue Lag-Correlator for Radio Interferometry | | Christian M. Holler
; Tak Kaneko
; Michael E. Jones
; Keith Grainge
; Paul Scott
; | | Date: |
23 Jan 2007 | | Abstract: | Aims: We describe a 6-12 GHz analogue correlator that has been developed for use in radio interferometers. Methods: We use a lag-correlator technique to synthesis eight complex spectral channels. Two schemes were considered for sampling the cross-correlation function, using either real or complex correlations, and we developed prototypes for both of them. We opted for the ``add and square’’ detection scheme using Schottky diodes over the more commonly used active multipliers because the stability of the device is less critical. Results: We encountered an unexpected problem, in that there were errors in the lag spacings of up to ten percent of the unit spacing. To overcome this, we developed a calibration method using astronomical sources which corrects the effects of the non-uniform sampling as well as gain error and dispersion in the correlator. | | Source: | arXiv, astro-ph/0701644 | | Services: | Forum | Review | PDF | Favorites | |
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