Phase correction for the BIMA array: atmospherical model calculations for the design of a prototype correlation radiometer

Details Phase correction for the BIMA array: atmospherical model calculations for the design of a prototype correlation radiometer Phase correction for the BIMA array: atmospherical model calculations for the design of a prototype correlation radiometer

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998spie.3357..432s&link_type=abstract

Proc. SPIE Vol. 3357, p. 432-441, Advanced Technology MMW, Radio, and Terahertz Telescopes, Thomas G. Phillips; Ed.

Astronomy and Astrophysics

Astronomy

2

Scientific paper

We present results from atmospheric model calculations for the design of an atmospheric phase correlation radiometer for the Berkeley-Illinois-Maryland Millimeter Array (BIMA). The radiometer will monitor the atmospheric path delay by observing the fluctuations in the emission from tropospheric water vapor which causes de-correlation of astronomical signals which are observed along different lines of sight. We discuss the applicability of monitoring the optically thick 183 GHz water line and the optically thin 22 GHz water line. We conclude that for the BIMA site, which is not extremely dry, optical depth effects make observations of the 183 GHz line unfavorable. We discuss possible observing schemes and conclude that a multi-channel radiometer provides the highest achievable accuracy, as it provides the possibility to fit a line shape model to the observed channels. Systematic errors due to the unknown altitude distribution of water vapor and optical depth effects can be significantly reduced by this scheme, compared to methods which only monitor the change of the peak brightness temperature of the water vapor line.

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