A digital correlation receiver for the GEETEE radio telescope |
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| Authors: | N Udaya Shankar T S Ravi Shankar |
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| Institution: | (1) Raman Research institute, 560080 Bangalore |
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| Abstract: | A 128-channel digital correlation receiver has been built for the GEETEE 1, the low-frequency radio telescope situated at
Gauribidanur, South India, (latitude 13°36′12′′ N). The receiver uses a modified doublesideband (DSB) technique. The quadrature
samples required for a DSB system are obtained by sampling the digitized intermediate frequency (I.F.) signals by two clocks
which are separated in time by one quarter of the period of the I.F. The visibilities required for one-dimensional synthesis
are measured using one-bit correlators. A technique to measure amplitude information for the signal using a threshold detector
and a one-bit correlator has been developed. The receiver has been successfully used for continuum, spectral-line and pulsar
observations. The antenna system of GEETEE and its configuration for one dimensional synthesis are also described in this
paper
This telescope is jointly operated by the Indian Institute of Astrophysics, Bangalore and the Raman Research Institute, Bangalore. |
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| Keywords: | DSB system one-bit correlator |
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