Other
Scientific paper
Mar 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999evga.conf..261s&link_type=abstract
13th Working Meeting on European VLBI for Geodesy and Astrometry, p. 261 - 164
Other
Scientific paper
A new instrument for measuring the atmospheric water vapour is being developed at the Onsala Space Observatory. It is a dual channel microwave radiometer, measuring the sky brightness temperatures at the double-side bands centered at 21 GHz and 31.4 GHz respectively. Compared to the radiometer presently operating at the observatory, the new instrument is more compact and mobile. It will be used for comparisons at the Onsala site, especially studying the effect of narrower antenna beams. It will also be operated at other sites, e.g. in the Swedish GPS-networkSWEPOS. The authors will discuss the basic design which, for example, employes two conical horns equipped with lenses. Each channel uses two reference temperature black bodies (matched loads) for calibration: one "warm" - at stabilized room temperature and one "hot" which is regulated 100 degC. The stability tests on the latter showed confinement within +/- 0.03 degC around 100 degC. The recent work on the microwave part and the data acqisition (DAQ) system will be presented together with the solution for the positioning of the radiometer. The interaction between the control and DAQ system and the microwave block of the instrument will be discussedas well as the precision of the acquired data.
Rieck C.
Stoew S.
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