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## The Calibration Signals of Water Vapor Radiometer

Transactions of IAA RAS, issue 46, 57–67 (2018)

Keywords: water vapor radiometer (WVR), atmosphere, brightness temperature, calibration, tropospheric delay, GNSS.

### Abstract

The constancy of the water vapor radiometer (WVR) calibration signals provides the accuracy of measured values over the long time interval. The requirements for the accuracy of equivalent noise temperature of calibration signals $𝑇_𝑘$ are substantiated in this paper. The methods and results of monitoring $𝑇_𝑘$ current values over the WVR interval during operating at “Quasar” network observatories are presented. Possible methods of $𝑇_𝑘$ measurements are considered: using an external wide-aperture cryogenic radiator with a known temperature, using internal WVR’s reference loads as noise generators and regularly conducted “tip-curve” calibrations. It is shown that the technical solutions incorporated in the WVR design ensured the required accuracy of calibration signals for more than three years of operation. The comparison of the tropospheric wet delay measured by WVR and the same one determined by processing signals of Global Navigation Satellite System (GNSS) confirms this conclusion.

### Citation

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G. N. Ilin. The Calibration Signals of Water Vapor Radiometer // Transactions of IAA RAS. — 2018. — Issue 46. — P. 57–67. @article{ilin2018, abstract = {The constancy of the water vapor radiometer (WVR) calibration signals provides the accuracy of measured values over the long time interval. The requirements for the accuracy of equivalent noise temperature of calibration signals $𝑇_𝑘$ are substantiated in this paper. The methods and results of monitoring $𝑇_𝑘$ current values over the WVR interval during operating at “Quasar” network observatories are presented. Possible methods of $𝑇_𝑘$ measurements are considered: using an external wide-aperture cryogenic radiator with a known temperature, using internal WVR’s reference loads as noise generators and regularly conducted “tip-curve” calibrations. It is shown that the technical solutions incorporated in the WVR design ensured the required accuracy of calibration signals for more than three years of operation. The comparison of the tropospheric wet delay measured by WVR and the same one determined by processing signals of Global Navigation Satellite System (GNSS) confirms this conclusion.}, author = {G.~N. Ilin}, doi = {10.32876/ApplAstron.46.57-67}, issue = {46}, journal = {Transactions of IAA RAS}, keyword = {water vapor radiometer (WVR), atmosphere, brightness temperature, calibration, tropospheric delay, GNSS}, pages = {57--67}, title = {The Calibration Signals of Water Vapor Radiometer}, url = {http://iaaras.ru/en/library/paper/1876/}, year = {2018} } TY - JOUR TI - The Calibration Signals of Water Vapor Radiometer AU - Ilin, G. N. PY - 2018 T2 - Transactions of IAA RAS IS - 46 SP - 57 AB - The constancy of the water vapor radiometer (WVR) calibration signals provides the accuracy of measured values over the long time interval. The requirements for the accuracy of equivalent noise temperature of calibration signals $𝑇_𝑘$ are substantiated in this paper. The methods and results of monitoring $𝑇_𝑘$ current values over the WVR interval during operating at “Quasar” network observatories are presented. Possible methods of $𝑇_𝑘$ measurements are considered: using an external wide-aperture cryogenic radiator with a known temperature, using internal WVR’s reference loads as noise generators and regularly conducted “tip-curve” calibrations. It is shown that the technical solutions incorporated in the WVR design ensured the required accuracy of calibration signals for more than three years of operation. The comparison of the tropospheric wet delay measured by WVR and the same one determined by processing signals of Global Navigation Satellite System (GNSS) confirms this conclusion. DO - 10.32876/ApplAstron.46.57-67 UR - http://iaaras.ru/en/library/paper/1876/ ER -