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## VLBI Backend Systems — Perspectives in 2012

Труды ИПА РАН, вып. 16, 128–138 (2007)

Ключевые слова: Very Long Baseline Interferometry (VLBI), radio astronomy, VLBI backend systems, VLBI backend area, domains transition point, radio observatories digital technology, data handling process, signal path, RFI and calibration effects, DSP algorithms, sensitivity of the observatories, global applications

### Аннотация

A new technological vision on the future of the VLBI backend area let envision a fully digital implementation of what was until now performed in the analog domain. Several advantages can indeed be expected moving the domains transition point in an earlier stage, at IF frequency instead than at the final base-band. Such quantum leap can be afforded because of the rapid changes in digital technology that radio observatories continue to look for maintaining their competitive edge. New processing technologies here discussed will make it possible to reconfigure the whole data handling process using digital conversion to base-band and then to fully benefit of the high data rates in new acquisition and data transport systems, while simultaneously improving the reliability and flexibility of the signal path. In addition, a digital representation of the IF and base-band signals will provide the opportunity to correct for various RFI and calibration effects using embedded DSP algorithms. In order to implement these new techniques a number of major modifications are needed at all telescopes for both single-dish and for VLBI operations. Such modifications could greatly enhance the overall sensitivity of the observatories and improve the reliability of operations. The new hardware should comply with the internationally adopted standards for VLBI in order to allow global applications. A description of one of the main developments in this area is reported, the DBBC projects. A general view is given together with some degree of details with respect to the implementation and achieved performance

### Цитирование

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G. Tuccari. VLBI Backend Systems — Perspectives in 2012 // Труды ИПА РАН. — 2007. — Вып. 16. — С. 128–138. @article{tuccari2007, abstract = {A new technological vision on the future of the VLBI backend area let envision a fully digital implementation of what was until now performed in the analog domain. Several advantages can indeed be expected moving the domains transition point in an earlier stage, at IF frequency instead than at the final base-band. Such quantum leap can be afforded because of the rapid changes in digital technology that radio observatories continue to look for maintaining their competitive edge. New processing technologies here discussed will make it possible to reconfigure the whole data handling process using digital conversion to base-band and then to fully benefit of the high data rates in new acquisition and data transport systems, while simultaneously improving the reliability and flexibility of the signal path. In addition, a digital representation of the IF and base-band signals will provide the opportunity to correct for various RFI and calibration effects using embedded DSP algorithms. In order to implement these new techniques a number of major modifications are needed at all telescopes for both single-dish and for VLBI operations. Such modifications could greatly enhance the overall sensitivity of the observatories and improve the reliability of operations. The new hardware should comply with the internationally adopted standards for VLBI in order to allow global applications. A description of one of the main developments in this area is reported, the DBBC projects. A general view is given together with some degree of details with respect to the implementation and achieved performance}, author = {G. Tuccari}, issue = {16}, journal = {Труды ИПА РАН}, keyword = {Very Long Baseline Interferometry (VLBI), radio astronomy, VLBI backend systems, VLBI backend area, domains transition point, radio observatories digital technology, data handling process, signal path, RFI and calibration effects, DSP algorithms, sensitivity of the observatories, global applications}, pages = {128--138}, title = {VLBI Backend Systems — Perspectives in 2012}, url = {http://iaaras.ru/library/paper/509/}, year = {2007} } TY - JOUR TI - VLBI Backend Systems — Perspectives in 2012 AU - Tuccari, G. PY - 2007 T2 - Труды ИПА РАН IS - 16 SP - 128 AB - A new technological vision on the future of the VLBI backend area let envision a fully digital implementation of what was until now performed in the analog domain. Several advantages can indeed be expected moving the domains transition point in an earlier stage, at IF frequency instead than at the final base-band. Such quantum leap can be afforded because of the rapid changes in digital technology that radio observatories continue to look for maintaining their competitive edge. New processing technologies here discussed will make it possible to reconfigure the whole data handling process using digital conversion to base-band and then to fully benefit of the high data rates in new acquisition and data transport systems, while simultaneously improving the reliability and flexibility of the signal path. In addition, a digital representation of the IF and base-band signals will provide the opportunity to correct for various RFI and calibration effects using embedded DSP algorithms. In order to implement these new techniques a number of major modifications are needed at all telescopes for both single-dish and for VLBI operations. Such modifications could greatly enhance the overall sensitivity of the observatories and improve the reliability of operations. The new hardware should comply with the internationally adopted standards for VLBI in order to allow global applications. A description of one of the main developments in this area is reported, the DBBC projects. A general view is given together with some degree of details with respect to the implementation and achieved performance UR - http://iaaras.ru/library/paper/509/ ER -