First spectra from a new, wide band, hybrid digital correlator spectrometer for the FIRST-HIFI instrument.

Details First spectra from a new, wide band, hybrid digital correlator spectrometer for the FIRST-HIFI instrument. First spectra from a new, wide band, hybrid digital correlator spectrometer for the FIRST-HIFI instrument.

Nov 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998ijimw..19.1471c&link_type=abstract

International Journal of Infrared and Millimeter Waves, Vol. 19, No. 11, p. 1471 - 1487

Astronomy and Astrophysics

Astronomy

Radio Astronomy: Space Instrumentation, Radio Astronomy: Heterodyne Spectrometers

Scientific paper

The authors have designed and built a new, wide band, modulable resolution spectrometer, in view of full astronomical qualifying tests, and to prepare future models for the FIRST satellite's heterodyne instrument. The spectrometer, a hybrid digital autocorrelator, offers flexibility in terms of bandwidth (from 170 MHz to 680 MHz) and resolution (from 700 kHz to 3 MHz). This spectrometer required the development of a dedicated analog filter bank, homemade samplers, and the design of full custom GaAs integrated circuits. Laboratory tests have shown excellent agreement with expected performances and observations performed with the IRAM 30-m radiotelescope have qualified its capabilities. Despite the relatively limited number of channels of the current prototype compared to other spectrometers, the main advantages are its stability (inherent to digital technique), and its spectral versatility. Microelectronics advances and rad-tolerance of the spectrometer components are used to prepare a new, compact, and low power consumption autocorrelator in view of a flight model for HIFI, the heterodyne instrument on the ESA cornerstone mission FIRST.

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