The digital multi-channel radiospectrograph in Nançay

Details The digital multi-channel radiospectrograph in Nançay The digital multi-channel radiospectrograph in Nançay

Dec 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982soph...81..383d&link_type=abstract

Solar Physics, Volume 81, Issue 2, pp.383-394

Physics

27

Scientific paper

We describe the new Solar Radio Spectrograph which has been operated at the Nançay Radio Astronomy Station since December 1978 for the analog part (which uses photographic film data acquisition) and since July 1979 using digital magnetic recording. This instrument was designed and built by the Space Research Department of the Paris Observatory and covers the range 469 110 MHz.
The multichannel receiver yields a high sensitivity, as compared to a sweep-frequency receiver and the frequency windows where external interference is present can be eliminated from the data acquisition.
The digital recording leads to convenient intensity calibration procedures and allows a modern data-handling over a large dynamic range: 50 dB with a 11 bit resolution.
Intermodulation effects due to non linearities have been kept to a minimum by building the multiplexer as a ‘tree’ and distributing the amplification along.
The time resolution allows the data to be acquired at a rate of 100 samples per second per frequency channel. The frequency resolution can take two values: 120 channels 1 MHz-wide and 100 channels 200 kHz-wide can be positioned anywhere in the range 110 469 MHz.
Some observations are shown including type V and type II-like bursts and harmonically related emission in hook structures. Some future plans are briefly mentioned aiming to perform circular polarization measurements in 120 frequency channels and real time data compression.

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