The New Wide Band Equipment for the URAN Interferometers

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Scientific paper

The decameter range VLBI network URAN consists of 5 radio telescopes including the world largest in the range - UTR-2. They make up interferometers with the baselines 42 to 946 km. Large size antennas arrays (up to 2 km), electrically controlled over both coordinates, are used to increase the sensitivity and decrease the confusion and interference effects. The system of distributed preamplification with a high dynamic range and receivers with narrow IF bandwidths (20 kHz) have been applied in order to minimize the broadcast station interference. Studies with the URAN were carrying out for a number of years and several tens of radio sources have been already observed successfully. For successful prolongation of the investigations it is necessary to increase the sensitivity of the system since the reliable determination of the sources angular structure needs a high signal-to-noise ratio. The increasing of the antennas effective area is cost-intensive and it is impossible now. An alternative way is a broadening of the received band and/or increasing of the coherent integration time to boost the radiometric gain. At the decameter wavelengths the coherent integration time is significantly limited by the effect of the interplanetary and ionosphere plasma. Front-end facility of all the URAN telescopes is broadband so a new generation of wideband back-end equipment has been developed including receivers with wide bandpass, fast ADCs and a computer based data storage devices. New equipment, the algorithms of the interferences rejection and the data reduction methods will be described in the report.

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